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Journal articles on the topic 'Schiff Schiff'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Çankaya, Nevin, Nevin Turan, and Özlem Sökmen. "SCHIFF BASE BIOPOLYMERS." e-Journal of New World Sciences Academy 1, no. 1 (September 10, 2016): 68–78. http://dx.doi.org/10.12739/nwsa.2016.1a11pb.

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2

Tülsner, Jens, and Ramona Herrfurth. "Schiff ahoi!" intensiv 26, no. 05 (September 2018): 228–30. http://dx.doi.org/10.1055/a-0641-9922.

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ZusammenfassungDie heutigen Einsatzmöglichkeiten von Fachkrankenpflegern sind breit. Verschiedene Disziplinen innerhalb und außerhalb des Krankenhauses sind dabei jedem bekannt, der sich gedanklich mit einer Veränderung seines beruflichen Umfelds beschäftigt. Mancher denkt auch über die Landesgrenzen hinaus, bezieht das nähere oder weitere Ausland in die Überlegungen für einen neuen Schritt mit ein. Dieser Artikel macht mit einem weiteren, weitgehend unbekannten Einsatzgebiet vertraut: Haben Sie schon einmal daran gedacht, auf einem Kreuzfahrtschiff zu arbeiten?
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3

Wiedemann, H. R. "Erwin Schiff." European Journal of Pediatrics 151, no. 12 (December 1992): 869. http://dx.doi.org/10.1007/bf01954119.

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4

Iacopetta, Domenico, Jessica Ceramella, Alessia Catalano, Carmela Saturnino, Maria Grazia Bonomo, Carlo Franchini, and Maria Stefania Sinicropi. "Schiff Bases: Interesting Scaffolds with Promising Antitumoral Properties." Applied Sciences 11, no. 4 (February 20, 2021): 1877. http://dx.doi.org/10.3390/app11041877.

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Schiff bases, named after Hugo Schiff, are highly reactive organic compounds broadly used as pigments and dyes, catalysts, intermediates in organic synthesis, and polymer stabilizers. Lots of Schiff bases are described in the literature for various biological activities, including antimalarial, antibacterial, antifungal, anti-inflammatory, and antiviral. Schiff bases are also known for their ability to form complexes with several metals. Very often, complexes of Schiff bases with metals and Schiff bases alone have demonstrated interesting antitumor activity. Given the innumerable vastness of data regarding antitumor activity of all these compounds, we focused our attention on mono- and bis-Schiff bases alone as antitumor agents. We will highlight the most significant examples of compounds belonging to this class reported in the literature.
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5

Wagh, Shaila, and B. R. Patil. "Synthesis and Spectral Characterization of Some New Novel Schiff bases Derived from Hydroxy Propiophenone." Oriental Journal Of Chemistry 37, no. 3 (June 30, 2021): 759–62. http://dx.doi.org/10.13005/ojc/370335.

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New Schiff bases derived by the condensation of methyl, chloro, and bromo substituted 2' hydroxy propiophenones with aliphatic and aromatic amines have been synthesized. The Schiff bases are yellow solids with sharp melting points. Schiff bases The spectral characterization of these newly synthesized Schiff base ligands has been done.These Schiff bases were characterized by IR spectroscopy, Nuclear magnetic resonance spectroscopy, UV spectroscopy, and Mass spectroscopy. IR spectra confirmed the presence of the phenolic OH group and azomethine group.
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6

Trofimova, Olga V., and Vladimir N. Trofimov. "ENTOMOPHAGES OF PINE CUTWORM (PANOLIS FLAMMEA SCHIFF.)." Bulletin of the Moscow State Regional University (Natural Sciences), no. 1 (2017): 39–48. http://dx.doi.org/10.18384/2310-7189-2017-1-39-48.

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7

Gangani, Bhavesh J., and Parsotam H. Parsania. "Conventional and Microwave Irradiated Syntheses of New Symmetric Double Schiff Bases of 1,1’-Bis(4-Amino Phenyl)Cyclohexane, their Spectral Characterization and Microbial Activity." International Letters of Chemistry, Physics and Astronomy 58 (September 2015): 33–39. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.58.33.

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Symmetric double Schiff bases of 1,1’- bis (4-amino phenyl) cyclohexane and substituted aromatic benzaldehydes were synthesized by thermal and microwave irradiated green chemistry techniques. The purity of Schiff bases was checked by TLC. The structure of Schiff bases were supported by UV, FTIR, 1HNMR and MS techniques. The antibacterial and antifungal activities of Schiff bases were checked against gram positive and gram negative microbes. Schiff bases showed moderate antibacterial activity but they showed good comparable antifungal activity against chosen microbes and standard drugs.
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8

Kajal, Anu, Suman Bala, Sunil Kamboj, Neha Sharma, and Vipin Saini. "Schiff Bases: A Versatile Pharmacophore." Journal of Catalysts 2013 (August 27, 2013): 1–14. http://dx.doi.org/10.1155/2013/893512.

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Schiff bases are condensation products of primary amines with carbonyl compounds gaining importance day by day in present scenario. Schiff bases are the compounds carrying imine or azomethine (–C=N–) functional group and are found to be a versatile pharmacophore for design and development of various bioactive lead compounds. Schiff bases exhibit useful biological activities such anti-inflammatory, analgesic, antimicrobial, anticonvulsant, antitubercular, anticancer, antioxidant, anthelmintic, antiglycation, and antidepressant activities. Schiff bases are also used as catalysts, pigments and dyes, intermediates in organic synthesis, polymer stabilizers, and corrosion inhibitors. The present review summarizes information on the diverse biological activities and also highlights the recently synthesized numerous Schiff bases as potential bioactive core.
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9

Celan, Paul. "Das Trunkene Schiff." Po&sie 124, no. 2 (2008): 25. http://dx.doi.org/10.3917/poesi.124.0025.

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10

Boden, Britta N., Amir Abdolmaleki, Cecily T. Z. Ma, and Mark J. MacLachlan. "New diformyldihydroxyaromatic precursors for luminescent Schiff base macrocycles: Synthesis, characterization, and condensation studies." Canadian Journal of Chemistry 86, no. 1 (January 1, 2008): 50–64. http://dx.doi.org/10.1139/v07-136.

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With the goal of preparing luminescent, fully conjugated Schiff base macrocycles, a series of precursors based on benzene, phenanthrene, and triphenylene with formylhydroxy functionalization have been prepared and characterized. The condensation of these compounds with substituted phenylenediamines to afford conjugated [2+2] or [3+3] Schiff base macrocycle has been investigated. Although the [3+3] Schiff base macrocycles could not be isolated, two new soluble and luminescent [2+2] Schiff base macrocycles with N2O2 binding pockets have been prepared and characterized.Key words: Schiff base, macrocycle, condensation, salicylaldehyde, conjugated.
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11

Rashad, Alaa A., Farah Muaiad, Ahmed Ahmed, EkhlasA Salman, and Evon Akram. "Synthesis and Photophysical Study of Divalent Complexes of Chelating Schiff Base." Baghdad Journal of Biochemistry and Applied Biological Sciences 1, no. 01 (October 31, 2020): 5–16. http://dx.doi.org/10.47419/bjbabs.v1i01.24.

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Background: Schiff base compounds derivative from1,2,4-triazole, and their transition metal complexes play an essential role in coordination and bioinorganic chemistry due to biological and industrial applications. Objective: The work aims to prepare and characterize of 1, 2, 4-triazole Schiff base and its complexes with a theoretical study using PM3 calculation and HyperChem program, photophysical properties, and surface morphology for these complexes. Methods: 1, 2, 4-triazole Schiff base prepared by condensation reaction between 4-Amino-3-mercapto-5-phenyl-4H-1,2,4-triazole and 2-hydroxy-1-naphthaldehyde, then Schiff base reacted with Co2+, Ni2+, and Cu2+ ions, the synthesized 1, 2, 4-triazole Schiff base, and its complexes were characterized by infrared spectra, magnetic susceptibility, conductivity measurements, photophysical properties, and surface morphology measured by atomic force microscopy. The practical results were reinforced with a theoretical study for these Schiff base complexes. Then the proposed structures of the prepared complexes. Results: 1, 2, 4-triazole Schiff base act as a chelate ligand. The coordination has occurred through the oxygen of the phenolic group O-H and the nitrogen of the imine group N=C of Schiff base with divalent metal ions. Cobalt complex has a tetrahedral geometry, while the nickel and copper complexes have square planar geometries. The stability of all compounds was studied by calculating the energy gap by diffuse reflectance spectroscopy and theoretical calculations. Copper Schiff base is a more stable complex due to the lower value of the energy gap, and the copper Schiff base complex is more semiconductivity than the other complexes. Surface morphology, properties of chelating Schiff base ligand and its complexes measured by atomic force microscopy, cobalt Schiff base complex is higher roughness. The bond length of (-C=N-), (-C-O-),(M-O), and (M-N) are affected in the coordination with metal ions, the bond length of the square planar geometry more affected than tetrahedral geometry. Conclusion: All compounds were prepared successfully, characterized, and photophysical properties were studied.
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12

Rashad, Alaa A., Farah Muaiad, Ahmed Ahmed, Ekhlas A. Salman, and Evon Akram. "Synthesis and Photophysical Study of Divalent Complexes of Chelating Schiff Base." Baghdad Journal of Biochemistry and Applied Biological Sciences 1, no. 01 (December 21, 2020): 5–16. http://dx.doi.org/10.47419/bjbabs.v1i01.27.

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Background: Schiff base compounds derivative from1,2,4-triazole, and their transition metal complexes play an essential role in coordination and bioinorganic chemistry due to biological and industrial applications. Objective: The work aims to prepare and characterize of 1, 2, 4-triazole Schiff base and its complexes with a theoretical study using PM3 calculation and HyperChem program, photophysical properties, and surface morphology for these complexes. Methods: 1, 2, 4-triazole Schiff base prepared by condensation reaction between 4-Amino-3-mercapto-5-phenyl-4H-1,2,4-triazole and 2-hydroxy-1-naphthaldehyde, then Schiff base reacted with Co2+, Ni2+, and Cu2+ ions, the synthesized 1, 2, 4-triazole Schiff base, and its complexes were characterized by infrared spectra, magnetic susceptibility, conductivity measurements, photophysical properties, and surface morphology measured by atomic force microscopy. The practical results were reinforced with a theoretical study for these Schiff base complexes. Then the proposed structures of the prepared complexes. Results: 1, 2, 4-triazole Schiff base act as a chelate ligand. The coordination has occurred through the oxygen of the phenolic group O-H and the nitrogen of the imine group N=C of Schiff base with divalent metal ions. Cobalt complex has a tetrahedral geometry, while the nickel and copper complexes have square planar geometries. The stability of all compounds was studied by calculating the energy gap by diffuse reflectance spectroscopy and theoretical calculations. Copper Schiff base is a more stable complex due to the lower value of the energy gap, and the copper Schiff base complex is more semiconductivity than the other complexes. Surface morphology, properties of chelating Schiff base ligand and its complexes measured by atomic force microscopy, cobalt Schiff base complex is higher roughness. The bond length of (-C=N-), (-C-O-),(M-O), and (M-N) are affected in the coordination with metal ions, the bond length of the square planar geometry more affected than tetrahedral geometry. Conclusion: All compounds were prepared successfully, characterized, and photophysical properties were studied.
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13

Abdelnabi, S., Chasib K. Bkhakh, and Mouayed Y. Kadhum. "Synthesis , spectroscopic characterization and biological study of some new Schiff bases based on 2-hydroxybenzadehyde." JOURNAL OF ADVANCES IN CHEMISTRY 13, no. 2 (July 11, 2017): 5995–6005. http://dx.doi.org/10.24297/jac.v13i12.6117.

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Four new Schiff bases were synthesized from condensation of aldehyde ( 2-hydroxy benzaldehyde ) with aromatic amines (4-introaniline ; 4,4-oxydianiline ; 4,4-diaminodipleny sulfone and sulfanilamide) . These Schiff bases were characterized by IR, NMR , GC. mass and element analysis. Moreover, the Schiff bases were screened for their antibacterial and antifungal activity against various microorganisms and compared with standard compounds. In general , the results were indicated that some Schiff bases had good antimicrobial activity.
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Hello, Kasim Mohammed, Abdul Karim-Talaq Mohammad, and Hiba Jumaah Ali. "Solid Melamine Sulfate for Schiff Base Synthesis." Chemistry & Chemical Technology 13, no. 2 (June 10, 2019): 198–204. http://dx.doi.org/10.23939/chcht13.02.198.

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15

Ismiyarto, Ismiyarto, Sesika Novari, Ngadiwiyana Ngadiwiyana, Purbowatiningrum Ria Sarjono, and Noor Basid Adiwibawa Prasetya. "MODIFIKASI KAIN AKTIF ANTIBAKTERI BERBASIS KOMPLEK Mn(II) BASA SCHIFF KITOSAN–SALISILALDEHID." Jurnal Penelitian Saintek 25, no. 1 (May 8, 2020): 11–23. http://dx.doi.org/10.21831/jps.v25i1.29821.

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Penelitian ini bertujuan untuk memperoleh kompleks Mn(II)-basa Schiff kitosan-salisaldehida dan menguji aktivitasnya sebagai bahan aktif kain antibakteri. Metode penelitian dilakukan melalui tiga tahapan. Pada tahap pertama dilakukan sintesis basa Schiff kitosan–salisilaldehid dengan mereaksikan kitosan dengan variasi mol salisilaldehid menggunakan campuran pelarut asam asetat dan etanol, diaduk pada suhu 50oC selama 6 jam. Pada tahap kedua, basa Schiff kitosan–salisilaldehid dijadikan kompleks dengan MnCl2.2H2O menggunakan campuran pelarut asam asetat 2% dan etanol, diaduk pada suhu 60oC selama 12 jam. Pada tahap ketiga dilakukan pelapisan kompleks pada kain katun menggunakan metode spray dan selanjutnya dilakukan uji antibakteri terhadap E. coli (G-) dan S. aureus (G+) menggunakan metode difusi cakram. Hasil penelitian menunjukkan bahwa basa Schiff kitosan–salisilaldehid dengan rasio substitusi paling besar (0,122) diperoleh ketika disintesis menggunakan salisilaldehid 0,00227 mol. Senyawa kompleks Mn(II)-basa Schiff kitosan–salisilaldehid yang terbentuk berupa serbuk berwarna hitam dengan rendemen 66%. Kain katun yang telah dilapisi kompleks Mn(II)-basa Schiff kitosan–salisilaldehid efektif menghambat pertumbuhan bakteri dengan persen daya hambat sebesar 16,02% terhadap bakteri E. coli (G-) dan 14,02% terhadap bakteri S. aureus (G+).MODIFICATION OF ANTIBACTERIAL FABRIC FROM Mn(II) SCHIFF BASE CHITOSAN - SALICYLALDEHYDE COMPLEXThis study was aimed at obtaining the complex of Mn(II)-Schiff base chitosan- salicylaldehyde and evaluating the activity of antibacterial agent on cotton fabric. The study was conducted through three treatment steps. In the first step, chitosan-salicylaldehyde Schiff base was synthesized by reacting chitosan with mole variations of salicylaldehyde and combined with a mixture of acetic acid and ethanol as the solvent which was then stirred at 50oC for 6 hours. In the second step, preparation complexes Mn(II)- Schiff base chitosan-salicylaldehyde was conducted by mixing chitosan-salicylaldehyde Schiff base and MnCl2.2H2O using acetic acid 2% -ethanol as a solvent at 60oC for 12 h. In the third step, the complex was coated onto fabric using spray method and the E. coli (G-) dan S. aureus (G+) antibacterial test was done to the coated fabric using disk diffusion method. The results showed that 0.00227 mole salicylaldehyde lead to the highest substitution ratio of Schiff base chitosan-salicylaldehyde of 0.122. The Mn(II)-Schiff base chitosan-salicylaldehyde complex was obtained as black powder with a yield of 66%. Cotton fabric that has been coated with the complex, effectively inhibits bacterial growth with a percent inhibition against E. coli (G-) and S. aureus (G+) bacteria of 16.02% and 14.02%, respectively.
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Jiao, Ti Feng, Xu Hui Li, Jing Xin Zhou, Jing Ya Liang, and Jing Ren. "Synthesis and Characterization of Some Functional Schiff Base Derivatives with Azobenzene Substituted Groups." Advanced Materials Research 197-198 (February 2011): 623–26. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.623.

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Some functional Schiff base derivatives with azobenzene substituted groups have been designed and synthesized from the reaction of aminoazobenzene with different aromatic aldehydes. It has been found that depending on the size of aromatic groups, the formed Schiff base derivatives showed different properties, indicating distinct regulation of molecular skeletons. UV and IR data confirmed commonly the formation of Schiff base as well as aromatic segment in molecular structures. Thermal analysis showed that the thermal stability of Schiff base molecules with naphthalene segment increased slightly in comparison with other derivatives. The difference of thermal stability is mainly attributed to the formation of Schiff base group and aromatic substituent groups in molecular structure. The present results have demonstrated that the special properties of Schiff base derivatives can be turned by modifying molecular structures of objective compounds with proper substituted groups, which show potential application in functional material field.
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Blagus, Anita, Dominik Cinčić, Tomislav Friščić, Branko Kaitner, and Vladimir Stilinović. "Schiff bases derived from hydroxyaryl aldehydes: molecular and crystal structure, tautomerism, quinoid effect, coordination compounds." Macedonian Journal of Chemistry and Chemical Engineering 29, no. 2 (December 15, 2010): 117. http://dx.doi.org/10.20450/mjcce.2010.159.

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During the last 50 years a vast number of structural studies on Schiff bases derived from hydroxyaryl aldehydes and their coordination compounds have been undertaken. In this review we present a systematic and brief overview of the most important discoveries and achievements accomplished in this field. The occurrence of Schiff bases (and their complexes) derived from nine most commonly used hydroxyaryl aldehydes in the Cambridge Structural Database (CSD) has been investigated. Keto-enol tautomerism and intramolecular hydrogen bonding in salicylaldimines and naphthaldimines is discussed, with a comment of the most common errors in determining the correct tautomeric form. Also, the interrelationship of crystal packing and the substituents on the Schiff base is studied. Finally, we give a short overview of conformational differences between free Schiff bases and Schiff bases bonded to metal ions as well as some structural characteristics of Schiff base metal complexes.
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18

Xu, Junpeng, Yi Liu, and Shan-hui Hsu. "Hydrogels Based on Schiff Base Linkages for Biomedical Applications." Molecules 24, no. 16 (August 19, 2019): 3005. http://dx.doi.org/10.3390/molecules24163005.

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Schiff base, an important family of reaction in click chemistry, has received significant attention in the formation of self-healing hydrogels in recent years. Schiff base reversibly reacts even in mild conditions, which allows hydrogels with self-healing ability to recover their structures and functions after damages. Moreover, pH-sensitivity of the Schiff base offers the hydrogels response to biologically relevant stimuli. Different types of Schiff base can provide the hydrogels with tunable mechanical properties and chemical stabilities. In this review, we summarized the design and preparation of hydrogels based on various types of Schiff base linkages, as well as the biomedical applications of hydrogels in drug delivery, tissue regeneration, wound healing, tissue adhesives, bioprinting, and biosensors.
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M. Ibrahim, Farah, and Saifaldeen M. Abdalhadi. "Performance of Schiff Bases Metal Complexes and their Ligand in Biological Activity: A Review." Al-Nahrain Journal of Science 24, no. 1 (March 1, 2021): 1–10. http://dx.doi.org/10.22401/anjs.24.1.01.

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Schiff bases are a broad class synthesized compound, which is prepared for the condensation process between the primary amine group and an aldehyde or ketone group. Schiff base metal complexes play an important role in many applications such as biological activity, catalytic activity, and optical property. The wide range application of Schiff base metal complexes came from the versatility of Schiff base reactions with many different transition metals. This flexibility of the reactions was given these complexes, many different properties and uses in a biological human system such as antibacterial, antifungal, anticancer, antimalarial, and others. This review gives many examples of Schiff bases, metal complexes, and there ligands with biological applications in the human system.
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20

Singh, Anil K., Camille Sandorfy, and Janos H. Fendler. "Dodecylammonium-glutamate Schiff bases of retinal." Canadian Journal of Chemistry 68, no. 7 (July 1, 1990): 1258–62. http://dx.doi.org/10.1139/v90-194.

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Dodecylammonium glutamate (4) has been prepared from dodecylamine (2) and l-glutamic acid (3) in ethanol and in aqueous ethanol. The obtained crystalline glutamic acid salt of dodecylamine (4) has been characterized by absorption, FTIR, 1H NMR, 13C NMR, and mass spectroscopy. Reaction of all-trans retinal (5) with the α-amino group of 4 gave a Schiff base (6), which was protonated by the α-COOH group of the glutamyl residue. However, the protonated Schiff base underwent acid-catalyzed hydrolysis to 2 + 3 + 5. Some of 5 reacted with 2 to give the corresponding Schiff base. The proposed structures have been substantiated by insitu absorption, FTIR, and 1H NMR spectroscopy. Keywords: retinal Schiff base, retinal, rhodopsin model, dodecylammonium glutamate, Schiff-base protonation.
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21

Ejidike, Ikechukwu P., and Peter A. Ajibade. "Transition metal complexes of symmetrical and asymmetrical Schiff bases as antibacterial, antifungal, antioxidant, and anticancer agents: progress and prospects." Reviews in Inorganic Chemistry 35, no. 4 (December 1, 2015): 191–224. http://dx.doi.org/10.1515/revic-2015-0007.

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AbstractThe huge research on Schiff base coordination complexes in the past few decades has given rise to several new molecules that have been of biological importance. The ease with which the Schiff base ligands are designed and prepared and their pattern is elucidated have made them to be referred to as “fortunate ligands” possessing azomethine derivatives, the C=N linkage that is essential for biological activity, including antibacterial, antifungal, antioxidant, anticancer, and diuretic activities. A variety of Schiff base and its complexes have been studied as model molecules for biological oxygen carrier systems. The uses of Schiff bases as DNA-cleaving agents and its mode of interaction and free-radical scavenging properties are described. The review encapsulates the applications of Schiff bases and their complexes.
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22

Tidwell, Thomas T. "Hugo (Ugo) Schiff, Schiff-Basen und hundert Jahre β-Lactam-Synthese." Angewandte Chemie 120, no. 6 (January 25, 2008): 1032–36. http://dx.doi.org/10.1002/ange.200702965.

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23

Fatoni, Ahmad, Poedji Loekitowati Hariani, Hermansyah Hermansyah, and Aldes Lesbani. "Synthesis and Characterization of Chitosan Linked by Methylene Bridge and Schiff Base of 4,4-Diaminodiphenyl Ether-Vanillin." Indonesian Journal of Chemistry 18, no. 1 (February 28, 2018): 92. http://dx.doi.org/10.22146/ijc.25866.

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The synthesis chitosan-methylene bridge-Schiff base of 4,4-diaminodiphenyl ether-vanillin using casting method has been done. The aims of this research were modification chitosan with Schiff base of 4,4-diaminodiphenyl ether-vanillin, formaldehyde and its characterization using FTIR spectroscopy, SEM analysis, 1H-NMR and X-Ray Diffraction analysis. The first step was a synthesis of modified chitosan between chitosan and Schiff base of 4,4-diaminodiphenyl ether-vanillin. The second step was chitosan modified Schiff base of 4,4-diaminodiphenyl ether-vanillin then reacted with formaldehyde through casting method. The result showed that chitosan can be modified with Schiff base of 4,4-diaminodiphenyl ether-vanillin and formaldehyde and this modified chitosan can be linked by methylene bridge (-NH-CH2-NH-) and had azomethine group (-C=N-). The functional group of –C=N in modified chitosan before and after adding formaldehyde appeared at a constant wavenumber of 1597 cm-1. The functional group C-N in methylene bridge detected at 1388 and 1496 cm-1. The chitosan-Schiff base of 4,4-diaminodiphenyl ether-vanillin and Chitosan-methylene bridge-Schiff base of 4,4-diaminodiphenyl ether-vanillin had index crystalline (%)16.04 and 25.76, respectively. The chemical sift of signal proton azomethine group (-C=N-) in modified chitosan detected at 8.44–8.48 and 9.77 ppm. Proton from methylene bridge in modified chitosan appeared at 4.97–4.99 and 3.75 ppm. Surface morphology chitosan-methylene bridge-Schiff base of 4,4-diaminodiphenylether-vanillin had dense surfaces, mostly uniform and regular in shape.
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Hassan, Ashraf S., Ahmed A. Askar, Ahmed M. Naglah, Abdulrahman A. Almehizia, and Ahmed Ragab. "Discovery of New Schiff Bases Tethered Pyrazole Moiety: Design, Synthesis, Biological Evaluation, and Molecular Docking Study as Dual Targeting DHFR/DNA Gyrase Inhibitors with Immunomodulatory Activity." Molecules 25, no. 11 (June 2, 2020): 2593. http://dx.doi.org/10.3390/molecules25112593.

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A series of Bis-pyrazole Schiff bases (6a–d and 7a–d) and mono-pyrazole Schiff bases (8a–d and 9a–d) were designed and synthesized through the reaction of 5-aminopyrazoles 1a–d with aldehydes 2–5 using mild reaction condition with a good yield percentage. The chemical structure of newly formed Schiff bases tethered pyrazole core was confirmed based on spectral and experimental data. All the newly formed pyrazole Schiff bases were evaluated against eight pathogens (Gram-positive, Gram-negative, and fungi). The result exhibited that, most of them have good and broad activities. Among those, only six Schiff bases (6b, 7b, 7c, 8a, 8d, and 9b) displayed MIC values (0.97–62.5 µg/mL) compared to Tetracycline (15.62–62.5 µg/mL) and Amphotericin B (15.62–31.25 µg/mL), MBC values (1.94–87.5 µg/mL) and selectivity to tumor cell than normal cells. Immunomodulatory activities showed that the promising Schiff bases increase the immunomodulator effect of defense cell and the Schiff base 8a is the highest one by (Intra. killing activity = 136.5 ± 0.3%) having a pyrazole moiety as well as amide function (O=C-NH2) and piperidinyl core. Furthermore, the most potent one exhibited broad activity depending on both MIC and MBC values. Moreover, to study the mechanism of these pyrazole Schiff bases, two active Schiff bases 8a and 9b from six derivatives were introduced to study the enzyme assay as dihydrofolate reductase (DHFR) on E. coli organism and DNA gyrase with two different organisms, S. aureus and B. subtilis, to determine the inhibitory activities with lower values in the case of DNA gyrase (8a and 9b) or nearly as DHFR compound 9b, while pyrazole 8a showed excellent inhibitory against all enzyme assay. The molecular docking study against dihydrofolate reductase and DNA gyrase were performed to study the binding between active site in the pocket with the two Schiff bases (8a and 9b) that exhibited good binding affinity with different bond types as H-bonding, aren-aren, and arene-cation interaction as well as study the physicochemical and pharmacokinetic properties of the two active Schiff bases 8a and 9b.
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Chaudhary, Nrendra Kumar. "Synthesis and medicinal use of Metal complexes of Schiff Bases." BIBECHANA 9 (December 10, 2012): 75–80. http://dx.doi.org/10.3126/bibechana.v9i0.7178.

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Different Schemes for the synthesis of Schiff bases have been discussed. Solvent free synthesis by microwave irradiation technique is observed to be rapid, more efficient and more economical and at the same time may play a pivotal role in the progress of Schiff base synthesis. Mechanism for the synthesis of Schiff bases at controlled pH range has been studied. Biological functions of metal complexes of Schiff bases have found to be increased potentiality in presence of transition metal ions. DOI: http://dx.doi.org/10.3126/bibechana.v9i0.7178 BIBECHANA 9 (2013) 75-80
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Kumar, Manoj, Anita Rani, Hardeep Singh Tuli, Rajshree Khare, and Vinit Parkash. "Synthesis and Spectral Investigations of Polymeric Hydrazone Schiff Base and its Transition Metal Complexes with Promising Antimicrobial, Anti-Angeogenic and DNA Photo-Cleavage Activities." Asian Journal of Chemistry 31, no. 10 (August 30, 2019): 2331–36. http://dx.doi.org/10.14233/ajchem.2019.22157.

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This report describes the synthesis and exploration of novel Schiff base ligand in the form of a polymer (heptamer) which was prepared by reaction between 3,4-diacetyl-2,5-hexanedione and hydrazine hydrate in ethanol. On further reaction of Schiff base with transition metals ions (Co and Cu) leads to formation of its transition metal complexes. The structural identification of Schiff base ligand and its transition metal complexes were characterized by classical structural techniques like FT-IR, NMR and mass spectra. The free ligand and its transition metal complexes have been screened for in vitro biological activities against various strains of bacteria and fungi. The prepared Schiff base and its metal complexes were also screened for antiangiogenic activity. The results have shown the remarkable antimicrobial and antiangiogenic activities of the Schiff base and its metal complexes.
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Devkota, Kishor, Govinda Pathak, and Bhushan Shakya. "Synthesis and Evaluation of Schiff Bases of 4-Amino-5-(chlorine substituted phenyl)-4H-1,2,4-triazole-3-thione as Antimicrobial Agents." Journal of Nepal Chemical Society 41, no. 1 (July 29, 2020): 26–35. http://dx.doi.org/10.3126/jncs.v41i1.30373.

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Triazole ring system has attracted a continuously growing interest of synthetic organic chemists and those dealing with the medicinal compounds due to its versatile potential to interact with biological systems. Schiff bases are also considered as one of the most biologically active compounds. The aim of the present study was to synthesize new Schiff bases bearing triazole nucleus and to assess their antimicrobial activities. Four new Schiff base derivatives of 1,2,4-triazole-3-thione were synthesized by combining two different pharmacophores viz. triazole nucleus and Schiff base moiety and were characterized by spectral techniques (UV, FT-IR, and NMR). The Schiff bases were evaluated for antibacterial (Staphylococcus aureus, Escherichia coli, and Klebsiella pneumoniae) and antifungal (Candida albicans) activities. The synthesized compounds exhibited good to moderate activities against different strains of bacteria and fungi tested.
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Gan, Kwang-Chun, Kooi-Mow Sim, Tuck-Meng Lim, and Kah-Cheng Teo. "Synthesis, Cytotoxic, Antibacterial and Free Radical Scavenging Activities of Schiff Bases Derived from 1,2,4-Triazole." Letters in Organic Chemistry 16, no. 12 (October 9, 2019): 996–1003. http://dx.doi.org/10.2174/1570178616666190315154512.

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: A series of new 1,2,4-triazole Schiff bases incorporating a chlorinated indole moiety were prepared from the condensation reaction of 4-amino-5-mercapto-3-[(5-chloro-2-methyl-1H-indol-3- yl)methyl]1,2,4-triazole with substituted benzaldehydes in the presence of (+)-tartaric acid as an acidic catalyst. The structures of Schiff bases were elucidated by FTIR, NMR and mass spectral data. The cytotoxic, antibacterial and free radical scavenging activities of Schiff bases were performed using MTT, 96-well microbroth dilution and DPPH assays, respectively. Schiff bases 3k and 3l with both electron donating groups at meta and para positions of the phenyl ring demonstrated higher cytotoxic activity against COLO-205 and A549 cell lines. On the other hand, Schiff base 3f comprising p-chlorophenyl substituent exhibited significant inhibition against Bacillus cereus and Staphylococcus aureus at MIC 3.91 μg/ml and 15.63 μg/ml, respectively. The results of the free radical scavenging activity revealed that Schiff bases with the presence of a Cl or OCH3 group in the para position of the phenyl ring act as a better antioxidant than BHT.
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Gan, Kwang-Chun, Kooi-Mow Sim, Tuck-Meng Lim, and Kah-Cheng Teo. "Synthesis, Cytotoxic, Antibacterial and Free Radical Scavenging Activities of New 1,2,4-Triazole Schiff Bases." Letters in Organic Chemistry 17, no. 3 (February 19, 2020): 191–98. http://dx.doi.org/10.2174/1570178616666190724114741.

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Twelve new 1,2,4-triazole Schiff bases bearing a fluorinated indole ring were successfully synthesized. The 1,2,4-triazole Schiff bases were synthesized from the condensation reaction of 4-amino-5-mercapto-3-[(5-fluoro-2-methyl-1H-indol-3-yl)methyl]-1,2,4-triazole with a series of benzaldehyde derivatives in the presence of (+)-tartaric acid as the catalyst. The structures of Schiff bases were elucidated by FTIR, NMR and mass spectral data. All newly synthesized Schiff bases were screened for their cytotoxic, antibacterial and free radical scavenging activities. Schiff bases 6b, 6c, 6i and 6j with hydroxyl group at ortho or meta position of the phenyl ring demonstrated higher cytotoxic activity against COLO-205 cell lines with IC50 94.0-144.3 µmol/mL. Schiff base bearing 2-OH and 5-Cl groups showed moderate antibacterial activity against Bacillus cereus at MIC 151 µmol/mL. On the other hand, compounds 6b (IC50 150.4 µmol/mL), 6e (IC50 146.4 µmol/mL), 6f (IC50 120.9 µmol/mL) and 6g (IC50 146.2 µmol/mL) displayed a better free radical scavenging activity than the standard BHT.
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Abdul Manan, Mohd Abdul Fatah, Hadariah Bahron, Karimah Kassim, Mohd Asrul Hafaz Mohamad, and Syed Nazmi Sayed Mohamad. "Synthesis, Characterization and Biological Activity of Nitrogen­ Oxygen-Sulfur (NOS) Transition Metal Complexes Derived from Novel S-2,4-dichlorobenzyldithiocarbazate with 5-fluoroisatin." Scientific Research Journal 7, no. 2 (December 31, 2010): 67. http://dx.doi.org/10.24191/srj.v7i2.9420.

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A novel Schiff base containing nitrogen-oxygen-sulfur (NOS) donor atoms formed from the condensation reaction of S-2,4-dichlorobenzyldithiocarbazate (S-2,4BDTC) with 5-fluroisatin has been synthesized. Complexes of cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) with this Schiff base have been prepared and characterized using elemental analysis and various physico-chemical techniques. In the cobalt(II) and nickel(II) complexes the Schiff base behaves as a uninegatively charged tridentate nitrogen-oxygen-sulfur (NOS) chelating ligand, bonding through the azomethine nitrogen, thiolate sulfur and carbonylic oxygen of the isatin moiety. However, in the copper(II), zinc(II) and cadmium(II) complexes the Schiff base behaves as a nitrogen-sulfur (NS) bidentate chelating ligand, bonding through the azomethine nitrogen and thiolate sulfur. The Schiff base and the metal complexes were evaluated with respect to antimicrobial activity, which was performed in relation to two selected pathogenic microbials (Bacillus subtilis and Pseudomonas aeruginosa). It was observed that only the zinc Schiff base complex exhibited strong activity against the Bacillus subtilis bacteria with an inhibition zone of 25 mm.
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Deivanayagam, Easwaramoorthi, Jayaprakash R, Aroj Kumar Sha, and Hemalatha S. "SYNTHESIS, CHARACTERIZATION, QUANTITATIVE STRUCTURE-ACTIVITY RELATIONSHIP, DOCKING, ANTIBACTERIAL ACTIVITY, AND BRINE SHRIMP LETHAL STUDIES ON L-PHENYLALANINE SCHIFF BASES." Asian Journal of Pharmaceutical and Clinical Research 9, no. 9 (December 1, 2016): 203. http://dx.doi.org/10.22159/ajpcr.2016.v9s3.14664.

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ABSTRACTObjective: Aim of this work is to synthesize and characterization of the hydroxyl group the hydroxyl group substituted L-phenylalanine Schiff basesto compare their predicted quantitative structure-activity relationship (QSAR) and molecular docking against Escherichia coli protein ZipA (1s1j)outcomes with the antibacterial activity and brine shrimp lethal assay (BSLA) results.Methods: The Schiff bases of L-Phenylalanine were synthesized by the simple condensation reaction using methanol, water in 2:1 ratio at reflux andwere characterized by spectral techniques. QSAR parameters of the Schiff bases were predicted using java-based online and offline tools. Moleculardocking carried through online mcule server and CLC Drug Discovery Workbench 3. Antibacterial activity and toxicity studies were conducted usingbroth dilution and brine shrimp lethal assay methods, respectively.Results: The Schiff bases fulfilled the QSAR drug-likeness parameters and showed the docking score between −6.8 and −6.0 Kcal/mol which arehigher than amoxilicillin and gentamicin like standard drugs. They also possess good inhibition for urinary tract infection causing E. coli bacteria,and minimum inhibitory concentrations (MIC) exists between 3.25 and 5.25 μg/ml. The brine shrimp lethal concentration for 50% mortality [LC50])between 58.73 and 135.6 μg/ml.Conclusion: Para, meta and 2,4 hydroxyl substituted Schiff bases exhibited good inhibition against Gram-negative E. coli bacteria at low concentrationand the MIC exists below the LC50 value. The Schiff base showed high drug score, high docking score, and low toxicity than other Schiff base. Dockingscore, high inhibition, low clogP, low MICKeywords: L-phenylalanine, Schiff base, Quantitative structure-activity relationship, Docking, Antibacterial, Lethal concentration for 50% mortality.
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Divya, Kumble, Geetha M. Pinto, and Asha F. Pinto. "APPLICATION OF METAL COMPLEXES OF SCHIFF BASES AS AN ANTIMICROBIAL DRUG: A REVIEW OF RECENT WORKS." International Journal of Current Pharmaceutical Research 9, no. 3 (May 5, 2017): 27. http://dx.doi.org/10.22159/ijcpr.2017.v9i3.19966.

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Schiff bases are versatile ligands which are synthesized from the condensation of primary amines with carbonyl groups. Synthesis of Schiff base transition metal complexes by using Schiff base as ligands appears to be fascinating in view of the possibility of obtaining coordination compounds of unusual structure and stability. These transition metal complexes have received exceptional consideration because of their active part in metalloenzymes and as biomimetic model compounds due to their closeness to natural proteins and enzymes. These compounds are very important in pharmaceutical fields because of their wide spectrum of biological activities. Most of them show biological activities including antibacterial, antifungal, antidiabetic, antitumor, antiproliferative, anticancer, herbicidal, and anti-inflammatory activities. The biological activity of the transition metal complexes derived from the Schiff base ligands has been widely studied. This review summarizes the importance, Scope and antimicrobial activities of Schiff base metal complexes.
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Jiao, Ti Feng, Juan Zhou, Jing Xin Zhou, Qiong Wang, and Xu Zhong Luo. "Research on Some Novel Trigonal Schiff Base Compounds With Aromatic Core and Different Substituted Groups." Advanced Materials Research 197-198 (February 2011): 598–601. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.598.

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Some novel trigonal Schiff base compounds with aromatic core and different substituted groups have been designed and synthesized from the reaction of trigonal aromatic amine with different aldehydes. It has been found that depending on the molecular structures and substituted groups, the formed trigonal Schiff base compounds showed different properties, indicating distinct regulation of molecular design. UV and IR data confirmed commonly the formation of Schiff base as well as aromatic segment in molecular structures. Thermal analysis also clarified the structural influence of these compounds in different temperature ranges. The difference of thermal stability is mainly attributed to molecular structures, formation of Schiff base group and different substituted groups. The present results have showed that the special properties of Schiff base compounds could be turned by modifying molecular structures and substituted groups, which show potential application in fields of functional material and catalyst.
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Laddha, Purushottam R., and Kailash R. Biyani. "Synthesis and Biological Evaluation of Novel Schiff Bases of Aryloxy Moiety." Journal of Drug Delivery and Therapeutics 9, no. 5-s (October 15, 2019): 44–49. http://dx.doi.org/10.22270/jddt.v9i5-s.3635.

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Schiff's bases are condensation products of primary amines with carbonyl compounds. Schiff bases (imines) possess wide variety of biological activities that include antibacterial and antifungal activity. In present work, Schiff bases from 3,5- Dimethoxyphenol (aryloxy moiety) as starting material synthesized. Esterification of 3,5- Dimethoxyphenol led to formation of (3,5-Dimethoxy-phenoxy)-acetic acid ethyl ester (1). (3,5-Dimethoxy-phenoxy)-acetic acid hydrazide (2) is derived from Compound (1) by hydrazination. Compound (2) was reacted with different aromatic aldehydes to yield novel imines or Schiff bases (3A-I). The newly synthesized compounds were characterized on the basis of spectral studies and evaluated for antibacterial and antifungal activities. All the synthesized compounds had shown antibacterial and antifungal activity. Schiff bases 3C, 3D, 3E and 3I had shown good antimicrobial activity among all newly synthesized compounds. Keywords: Schiff base, aryloxy moiety, imines
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Chohan, Zahid H., Asifa Munawar, and Claudiu T. Supuran. "Transition Metal Ion Complexes of Schiff-bases. Synthesis, Characterization and Antibacterial Properties." Metal-Based Drugs 8, no. 3 (January 1, 2001): 137–43. http://dx.doi.org/10.1155/mbd.2001.137.

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Some novel transition metal [Co(II), Cu(II), Ni(II) and Zn(II)] complexes of substituted pyridine Schiff-bases have been prepared and characterized by physical, spectral and analytical data. The synthesized Schiff-bases act as deprotonated tridentate for the complexation reaction with Co(II), Ni(II) and Zn(II) ions. The new compounds, possessing the general formula [M(L)2] where [M=Co(II), Cu(II), Ni(II) and Zn(II) and HL=HL1, HL2, HL3 and HL4] show an octahedral geometry. In order to evaluate the effect of metal ions upon chelation, the Schiff bases and their complexes have been screened for antibacterial activity against the strains such as Escherichia coli,Staphylococcus aureus, and Pseudomonas aeruginosa. The complexed Schiff bases have shown to be more antibacterial against one more bacterial species as compared to uncomplexed Schiff-bases.
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Al-Serwi, Rasha H., Gamal Othman, Mohammed A. Attia, Eman T. Enan, Mohamed El-Sherbiny, Seham Mahmoud, and Nehal Elsherbiny. "Enhancement of Cisplatin Cytotoxicity by Cu(II)–Mn(II) Schiff Base Tetradentate Complex in Human Oral Squamous Cell Carcinoma." Molecules 25, no. 20 (October 14, 2020): 4688. http://dx.doi.org/10.3390/molecules25204688.

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Oral squamous cell carcinoma (SCC) is one of the most predominant tumors worldwide and the present treatment policies are not enough to provide a specific solution. We aimed to assess the cytotoxic effect of Cu(II)–Mn(II) Schiff base tetradentate complex alone or in combination with cisplatin against squamous cell carcinoma cell line (SCCs) in vitro. Oral-derived gingival mesenchymal stem cells (GMSCs) were used as control. The cell viability was assessed by MTT assay. IC50 values were calculated. Evaluation of apoptosis and DNA damage were performed. In addition, the expression of pro-apoptotic and anti-apoptotic genes and proteins were tested. IC50 values indicated less toxicity of the Schiff base complex on GMSCs compared to cisplatin. Schiff base complex treatment resulted in up-regulation of p53 and Bax genes expression and down-regulation of Bcl2 gene expression in SCCs paralleled with increased protein expression of caspase-3 and Bax and down-regulation of Bcl-2 protein. Annexin V-FITC apoptosis kit showed a higher apoptotic effect induced by a Schiff base complex compared to the cisplatin-treated group. These effects were markedly increased on the combination of Schiff base and cisplatin. The present study established that Cu(II)–Mn(II) Schiff base tetradentate complex might induce a cytotoxic effect on SCCs cells via induction of the apoptotic pathway. Moreover, this Schiff base complex augments the anticancer effect of cisplatin.
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Ommenya, F. K., E. A. Nyawade, D. M. Andala, and J. Kinyua. "Synthesis, Characterization and Antibacterial Activity of Schiff Base, 4-Chloro-2-{(E)-[(4-Fluorophenyl)imino]methyl}phenol Metal (II) Complexes." Journal of Chemistry 2020 (March 30, 2020): 1–8. http://dx.doi.org/10.1155/2020/1745236.

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A new series of Mn (II), Co (II), Ni (II), Cu (II), and Zn (II) complexes of the Schiff base ligand, 4-chloro-2-{(E)-[(4-fluorophenyl)imino]methyl}phenol (C13H9ClFNO), was synthesized in a methanolic medium. The Schiff base was derived from the condensation reaction of 5-chlorosalicylaldehyde and 4-fluoroaniline at room temperature. Elemental analysis, FT-IR, UV-Vis, and NMR spectral data, molar conductance measurements, and melting points were used to characterize the Schiff base and the metal complexes. From the elemental analysis data, the metal complexes formed had the general formulae [M(L)2(H2O)2], where L = Schiff base ligand (C13H9ClFNO) and M = Mn, Co, Ni, Cu, and Zn. On the basis of FT-IR, electronic spectra, and NMR data, “O” and “N” donor atoms of the Schiff base ligand participated in coordination with the metal (II) ions, and thus, a six coordinated octahedral geometry for all these complexes was proposed. Molar conductance studies on the complexes indicated they were nonelectrolytic in nature. The Schiff base ligand and its metal (II) complexes were tested in vitro to evaluate their bactericidal activity against Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa) and Gram-positive bacteria (Bacillus subtilis and Staphylococcus typhi) using the disc diffusion method. The antibacterial evaluation results revealed that the metal (II) complexes exhibited higher antibacterial activity than the free Schiff base ligand.
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Yaseen, Anaheed A., Emaad T. B. Al-Tikrity, Emad Yousif, Dina S. Ahmed, Benson M. Kariuki, and Gamal A. El-Hiti. "Effect of Ultraviolet Irradiation on Polystyrene Containing Cephalexin Schiff Bases." Polymers 13, no. 17 (September 2, 2021): 2982. http://dx.doi.org/10.3390/polym13172982.

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The scale of production of polystyrene has escalated in the recent past in order to meet growing demand. As a result, a large quantity of polystyrene waste continues to be generated along with associated health and environmental problems. One way to tackle such problems is to lengthen the lifetime of polystyrene, especially for outdoor applications. Our approach is the synthesis and application of new ultraviolet photostabilizers for polystyrene and this research is focused on four cephalexin Schiff bases. The reaction of cephalexin and 3-hydroxybenzaldehyde, 4-dimethylaminobenzaldehyde, 4-methoxybenzaldehyde, and 4-bromobanzaldehyde under acidic condition afforded the corresponding Schiff bases in high yields. The Schiff bases were characterized and their surfaces were examined. The Schiff bases were mixed with polystyrene to form homogenous blends and their effectiveness as photostabilizers was explored using different methods. The methods included monitoring the changes in the infrared spectra, weight loss, depression in molecular weight, and surface morphology on irradiation. In the presence of the Schiff bases, the formation of carbonyl group fragments, weight loss, and decrease in molecular weight of polystyrene were lower when compared with pure polystyrene. In addition, undesirable changes in the surface such as the appearance of dark spots, cracks, and roughness were minimal for irradiated polystyrene containing cephalexin Schiff bases. Mechanisms by which cephalexin Schiff bases stabilize polystyrene against photodegradation have also been suggested.
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Mandal, Arnab, Abani Sarkar, Amit Adhikary, Debabrata Samanta, and Debasis Das. "Structure and synthesis of copper-based Schiff base and reduced Schiff base complexes: a combined experimental and theoretical investigation of biomimetic catalytic activity." Dalton Transactions 49, no. 43 (2020): 15461–72. http://dx.doi.org/10.1039/d0dt02784g.

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Chowdhury, Additi Roy, Pritam Ghosh, Biswajit Gopal Roy, Subhra Kanti Mukhopadhyay, Partha Mitra, and Priyabrata Banerjee. "A simple and dual responsive efficient new Schiff base chemoreceptor for selective sensing of F− and Hg2+: application to bioimaging in living cells and mimicking of molecular logic gates." RSC Advances 5, no. 76 (2015): 62017–23. http://dx.doi.org/10.1039/c5ra06105a.

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Oktaviani, Niken, Leny Heliawati, and Yudhie Suchyadi. "SYNTHESIS OF SCHIFF BASE VERDANTIOL BY SIMPLE CONDENSATION." Journal of Science Innovare 2, no. 2 (December 5, 2019): 48–50. http://dx.doi.org/10.33751/jsi.v2i2.1533.

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Schiff base is a chemical compound that is formed from the reaction between aldehydes and primary amines by condensation and produces by-products in the form of water. Schiff base is the raw material that is added in making Fragrance. The purpose of this study was to determine the method of synthesis of Schiff base verdantiol with simple condensation. The research method was carried out with four stages: preparation, synthesis, testing and measurement of parameters, and calculations. Preparation includes weighing the raw material Schiff base verdantiol. Schiff base synthesis is carried out by stirring at a temperature of about 90°C ± 5° C (Arctender, 1969) with a modification time of 15 minutes, 30 minutes, 1 hour, 2 hours and 3 hours. Testing and measurement parameters include organoleptic, density and specific gravity tests in pycnometer and compound confirmation using Gas Chromatography Mass Spectrometry. The results showed that the optimum synthesis of Schiff base verdantiol compounds was carried out at a heating time of 2 hours. The results of odor, color, density and gravity specifications heating time 2 hours according to specifications with the standard. GCMS confirmation results at 2 hours percent similarity are above 94%.
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Sharma, Preeti, and Vedula Uma. "Schiff Base Anchored with Silver Nanoparticles as Effective Adsorbent for Removal of Cadmium(II) Heavy Metal from Industrial Wastewater." Asian Journal of Chemistry 32, no. 8 (2020): 1941–46. http://dx.doi.org/10.14233/ajchem.2020.22694.

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The current study deals with the examination of the capacity of Schiff base anchored with silver nanoparticles for removal of cadmium(II) ions from industrial wastewater. Schiff base was synthesized using refluxing of salicylaldehyde and 4-aminoantipyrine in alcoholic medium. The characterization of Schiff base were studied by elemental analysis, FTIR, NMR, UV-visible and mass spectral studies. The silver nanoparticles were synthesized using the chemical reduction method and characterized. Then, silver nanoparticles anchored to the Schiff base by suitable method and again characterized. Peanut shells were used as solid phase for removal of Cd(II) ions. The effects of several parameters to optimize the adsorption of Cd(II) ions on solid phase, including pH, contact time, initial metal ion concentration and adsorbent weight were investigated. The maximum removal efficiency of Cd(II) ions on solid phase using Ag nano@Schiff base was achieved under experimental conditions of pH 6 (% removal = 81%), contact time of 15 min (% removal = 93%), initial metal ion concentration of 0.5 ppm (% removal = 95%) and adsorbent weight of 3 mg (% removal = 89%). The results showed that extraction of Cd2+ on AgNPs@Schiff base follows Freundlich adsorption isotherm.
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Jiao, Ti Feng, Jian Liu, Jing Xin Zhou, Xu Hui Li, and Yuan Yuan Xing. "Design and Investigation of Novel L-Glutamate-Based Schiff Base Compounds with Different Substituted Groups." Key Engineering Materials 474-476 (April 2011): 1529–33. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1529.

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Some novel L-glutamate-based Schiff base compounds with glutamate segment and different substituted groups have been designed and synthesized from the reaction of aromatic L-glutamate amine with different aldehydes. It has been found that depending on the molecular structures and substituted groups, the formed Schiff base compounds showed different properties, indicating distinct regulation of molecular design. UV and IR data confirmed commonly the formation of Schiff base as well as aromatic substituted groups in molecular structures. Thermal analysis also clarified the structural influence of these compounds in different temperature ranges. The difference of thermal stability is mainly attributed to molecular structures, formation of Schiff base group and different substituted groups. These results indicated that the the special properties of Schiff base compounds could be regulated through the design of molecular structures and substituted groups, which leads to potential application in fields of functional material as well as catalyst.
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44

Xu, Jing Xian, Ye Ting Lin, Qiang Lin, Wen Yuan, Xue Qiong Yin, and Yang Cao. "Preparation, Characterization and Antibacterial Activity of Chitosan Schiffbases." Advanced Materials Research 287-290 (July 2011): 1947–51. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1947.

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Two Schiff bases of chitosan (CTS) were synthesized from 4-methoxylbenzylaldehyde (CH3O-CTS) and 4-methylbenzylaldehyde(CH3-CTS). The Schiff bases were characterized by FTIR, DSC-TGA, solid13C CP-Mas NMR, and elemental analysis. Antibacterial activities of the Schiff bases against Escherichia coli and Staphylococcus aureus were measured by the optical density method. The antibacterial activity of the Schiff bases is better than that of the original CTS. The IC50of CH3O-CTS and CH3-CTS againstEscherichia coliis respectively 40.3 ppm and 43 ppm, which being 38.5 ppm and 39.5 ppm against Staphylococcus aureus, lower than IC50of chitosan, being 59.5 ppm and 52 ppm againstEscherichia coliand Staphylococcus aureus, respectively.
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Saxena, N., S. Kumar, M. K. Sharma, and S. P. Mathur. "Corrosion Inhibition of Mild Steel in Nitric Acid Media by some Schiff Bases Derived from Anisalidine." Polish Journal of Chemical Technology 15, no. 1 (March 1, 2013): 61–67. http://dx.doi.org/10.2478/pjct-2013-0011.

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Corrosion inhibition performance of mild steel in nitric acid solution containing different concentration of anisalidine derivative Schiff bases viz. N- (4-nitro phenyl) p-anisalidine (SB1), N- (4-chloro phenyl) p-anisalidine (SB2), N- (4-phenyl) p-anisalidine (SB3), N- (4-methoxy phenyl) p-anisalidine (SB4), N- (4-hydroxy phenyl) p-anisalidine (SB5) has been investigated using mass loss, thermometric and potentiostate polarization technique. Inhibition efficiencies of Schiff bases have been evaluated at different acid strength. The inhibition efficiency was found larger than their parent amines. Inhibition efficiencies of synthesized Schiff bases increase with inhibitor concentration. Inhibition efficiency increases up to 98.32% with ansalidine derivative Schiff base.
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46

Yousif, Emad, Dina Ahmed, Gamal El-Hiti, Mohammad Alotaibi, Hassan Hashim, Ayad Hameed, and Ahmed Ahmed. "Fabrication of Novel Ball-Like Polystyrene Films Containing Schiff Base Microspheres as Photostabilizers." Polymers 10, no. 11 (October 24, 2018): 1185. http://dx.doi.org/10.3390/polym10111185.

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Polystyrene films containing a low concentration of three highly aromatic Schiff bases were prepared using the casting method. The polystyrene films were irradiated with ultraviolet light (300 h). The polystyrene infrared spectra, weight loss, molecular weight reduction and the surface morphology were examined upon irradiation. The Schiff bases acted as photostabilizers and reduced the photodegradation of polystyrene films to a significant level in comparison to the blank film. The images recorded of the surface of the miscible polystyrene/Schiff base blends showed novel ball-like microspheres with a diameter of 3.4–4.3 µm. The Schiff bases were able to endow excellent protection to polystyrene against ultraviolet irradiation.
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Journal, Baghdad Science. "Synthesis of substituted (oxazepine, Diazepine, tetrazde) via Schiff Bases for 2- Aminobenzo Thaizole Derivatives." Baghdad Science Journal 10, no. 3 (September 1, 2013): 736–48. http://dx.doi.org/10.21123/bsj.10.3.736-748.

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This work includs synthesis of several Schiff bases by condensation of 6- methoxy – 2- amino benzothiazole with some aldehydes and ketones (2- hydroxyl benzaldehyde, 4- hydroxyl benzaldehyde, 4- N,N –dimethy amino acetophenone, benzophenone) to abtain schiff bases (1-5). These schiff bases were found to react with phthalate anhydride to give oxazepine derivatives (6-10) that were reacted with primary aromatic amines to give Diazepine derivatives (11-15). Besides, we prepared new tetrazole derivatives (16-20) from the reaction of the prepared Schiff bases with sodium azide in the prepared compounds that were characterized by physical properties, FT-IR and some of the 1H-NMR and 13C –NMR spectroscopy.
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Ahmed, Dina S., Mohammed Kadhom, Angham G. Hadi, Muna Bufaroosha, Nadia Salih, Wedad H. Al-Dahhan, and Emad Yousif. "Tetra Schiff Bases as Polyvinyl Chloride Thermal Stabilizers." Chemistry 3, no. 1 (February 17, 2021): 288–95. http://dx.doi.org/10.3390/chemistry3010021.

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Tetra Schiff bases were used as thermal stabilizers to enhance the properties of polyvinyl chloride (PVC) when operated at high temperatures. The thermal stability of PVC films doped with Schiff bases was tested by the weight-loss method, Fourier transform infrared (FTIR) spectroscopy, thermal aging test, optical microscope, and atomic force microscope (AFM). Results showed that embedding these additives increased the stability time of the polymer, which decreased the degradation reaction tendency. Furthermore, the primary color of PVC was improved by adding the Schiff bases using oven-aging. In addition, these Schiff bases resulted in a significant reduction in PVC’s conjugated double bonds and, hence, the weight loss.
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Todd, David. "Schiff base puzzle project." Journal of Chemical Education 69, no. 7 (July 1992): 584. http://dx.doi.org/10.1021/ed069p584.

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Schiff, N. D., J. T. Giacino, K. Kalmar, J. D.Victor, K. Baker, M. Gerber, B. Fritz, et al. "Schiff et al. reply." Nature 452, no. 7183 (March 2008): E1—E2. http://dx.doi.org/10.1038/nature06575.

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