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Journal articles on the topic 'Schiff-basis'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Nozima, Khabibullaeva, and Khaitbaev Alisher. "Synthesis Of Schiff Bases From Glucosamine On The Basis Of Apis Mellifera." American Journal of Applied Sciences 02, no. 09 (2020): 263–72. http://dx.doi.org/10.37547/tajas/volume02issue09-37.

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2

Wang, Lei, Yaqing Feng, Jinqiang Xue, and Li Yukun. "Synthesis and characterization of novel porphyrin Schiff bases." Journal of the Serbian Chemical Society 73, no. 1 (2008): 1–6. http://dx.doi.org/10.2298/jsc0801001w.

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Novel porphyrin Schiff bases were synthesized by a simple Schiff base condensation in refluxing toluene between 5-(4-aminophenyl)-10,15,20-triphe?nylporphyrin (ATTP) 3 and styryl aldehydes 4-6 or p-halobenzaldehydes 7-9. The newly synthesized porphyrin Schiff bases were characterized on the basis of their chemical properties and spectral data. A good intramolecular energy transfer from the styryl unit to the porphyrin moiety was found.

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3

Chohan, Zahid H., M. A. Farooq, and Claudiu T. Supuran. "Copper (II) Acylhydrazinates. Their Synthesis and Characterization." Metal-Based Drugs 8, no. 3 (2001): 171–77. http://dx.doi.org/10.1155/mbd.2001.171.

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Acylhydrazine derived furanyl and thienyl Schiff bases and their Cu(II) complexes have been prepared and characterized on the basis of their physical, spectral and analytical data. The preferred enolic form of the Schiff base function as a tetradentate ligand during coordination to the metal ion yielding a square planar complex. The Schiff bases and their complexes with different anions were tested for their antibacterial activity against bacterial species such as Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa andKlebsiella pneumonae.

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4

Gulzar, Aqsa, Tariq Mahmud, Liviu Mitu, Rubina Munir, Muhammad Imran, and Kiran Iftikhar. "Synthesis, Characterization and Biological Activities of a Schiff Base Derived from 2-[(1,3-benzothiazol-2-yl)sulfanyl]-N-[4-(hydrazinecarbonyl)phenyl]acetamide and its Complexes with Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) Ions." Revista de Chimie 70, no. 2 (2019): 596–601. http://dx.doi.org/10.37358/rc.19.2.6963.

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A new Schiff base ligand from 2-[(1,3-benzothiazol-2-yl)sulfanyl]-N-[4-(hydrazinecarbonyl)phenyl]acetamide (BHA) and its five metal complexes with transition metal ions [Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)] have been synthesized. The resulting compounds were subsequently characterized by FTIR, UV-Vis, AAS, 1H NMR, 13C NMR and mass spectrometry. The proposed geometries of the Schiff base metal complexes were established on the basis of metal / ligand ratio, through AAS/ICP, electronic spectroscopy and magnetic data. The synthesized Schiff base and its complexes were further investigated f

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5

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 (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

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6

Militsina, O. I., I. Yu Strobykina, G. I. Kovylyaeva, et al. "Synthesis of Schiff bases on the basis of the isosteviol terpenoid." Russian Journal of General Chemistry 77, no. 2 (2007): 285–96. http://dx.doi.org/10.1134/s1070363207020168.

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7

Chohan, Zahid H., M. Praveen, and A. Ghaffar. "Structural and Biological Behaviour of Co(II), Cu(II) and Ni(II) Metal Complexes of Some Amino Acid Derived Schiff-Bases." Metal-Based Drugs 4, no. 5 (1997): 267–72. http://dx.doi.org/10.1155/mbd.1997.267.

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Biologically active tridentate amino acid (Alanine, Glycine & Tyrosine) derived Schiff-bases and their Co(II), Cu(II) & Ni(II) complexes have been synthesised and characterised on the basis of their conductance and magnetic measurements, elemental analysis and C13-NMR, H1-NMR, IR and electronic spectral data. These Schiff-bases and their complexes have been evaluated for their antibacterial activity against bacterial species such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumonae, Proteus vulgarus and Pseudomonas aeruginosa and this activity data show the metal complexes

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8

Chohan, Zahid H., M. A. Farooq, and M. S. Iqbal. "Synthesis, Characterization and Biological Properties of Anions of Bivalent Transition Metal [Co(II) and Ni(II)] Complexes With Acylhydrazine Derived ONO Donor Schiff Bases." Metal-Based Drugs 7, no. 3 (2000): 133–39. http://dx.doi.org/10.1155/mbd.2000.133.

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Some acylhydrazine derived ONO donor Schiff bases and their Co(II) and Ni(II) complexes have been prepared having the same metal ion (cation) but different anions. These synthesized metal(II) complexes have been characterized on the basis of their elemental analyses, magnetic moment, molar conductance, and IR and electronic spectral data. All of the Schiff base ligands function as tridentates and the deprotonated enolic form is preferred for coordination. In order to evaluate the effect of anions on the bactericidal activity, these synthesized complexes, in comparison to the uncomplexed Schiff

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9

Singh, Har Lal, and A. K. Varshney. "Synthetic, Structural, and Biochemical Studies of Organotin(IV) with Schiff Bases Having Nitrogen and Sulphur Donor Ligands." Bioinorganic Chemistry and Applications 2006 (2006): 1–7. http://dx.doi.org/10.1155/bca/2006/23245.

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Three bidentate Schiff bases having nitrogen and sulphur donor sequences were prepared by condensing S-benzyldithiocarbazate (NH2NHCS2CH2C6H5) with heterocyclic aldehydes. The reaction of diphenyltin dichloride with Schiff bases leads to the formation of a new series of organotin(IV) complexes. An attempt has been made to prove their structures on the basis of elemental analyses, conductance measurements, molecular weights determinations, UV, infrared, and multinuclear magnetic resonance (H1,C13, andS119n) spectral studies. Organotin(IV) complexes were five- and six-coordinate. Schiff bases an

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10

Chohan, Zahid H., and Samina Kausar. "Synthesis, Characterization and Biological Properties of Tridentate NNO, NNS and NNN Donor Thiazole-Derived Furanyl, Thiophenyl and Pyrrolyl Schiff Bases and Their Co(II), Cu(II), Ni(II) and Zn(II) Metal Chelates." Metal-Based Drugs 7, no. 1 (2000): 17–22. http://dx.doi.org/10.1155/mbd.2000.17.

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2-Aminothiazole undergoes condensation reactions with furane-, thiophene- and pyrrole-2-carboxylaldehyde to give tridentate NNO, NNS and NNN Schiff bases respectively. These tridentate Schiff bases formed complexes of the type [M (L)2]X2 where [M=Co(II), Cu(II), Ni(II) or Zn(II), L=N-(2-furanylmethylene)-2-aminothiazole (L1), N-(2-thiophenylmethylene)-2-aminothiazole (L2), N-(2-pyrrolylmethylene)-2-aminothiazole (L3) and X=Cl. The structures of these Schiff bases and of their complexes have been determined on the basis of their physical, analytical and spectral data. The screening results of t

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11

Halder, Kalpataru, and Utpal Saha. "Synthesis and Evaluation of Cr (III), Mn (III) and Fe (III) Schiff Base of Metals Complexes." Journal of Drug Delivery and Therapeutics 9, no. 3 (2019): 114–16. http://dx.doi.org/10.22270/jddt.v9i3.2609.

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A novel synthesized Schiff base metal complexes Cr (III), Mn (III) and Fe (III) of 2-hydroxy-5-chloro acetophenone 2-imino-4-phenyl thiazole were prepared by condensed from 2-hydroxy-5-chloro acetophenone and 2-amino-4-phenyl thiazole have been synthesized and characterized on the basis of elemental analysis, Infrared, 1H NMR, molar conductance and magnetic susceptibilities analysis. The Schiff base acts as a monobasic bidentate ligand commonly coordinates through the oxygen atom of phenolic OH group and the nitrogen atom of azomethine group, which is confirmed by IR spectral data. All the met

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12

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(

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13

Journal, Baghdad Science. "Synthesis, Characterization and Antimicrobial activity Study Via some new Schiff bases for Trimethoprim." Baghdad Science Journal 7, no. 1 (2010): 614–20. http://dx.doi.org/10.21123/bsj.7.1.614-620.

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This search reports the synthesis of some new series of Schiff base compounds for trimetheprim derivatives which known high been known as a medicinal effectiveness. Trimetheprim was condensed with several substituted aldehydes compounds.(4-dimethyl amine benzaldehyde , propanal , salicaldehyde, 2.4 dimethoxy benzaldehyde and 4- methyl benzaldehyde) to obtain Schiff base products(1a-5a) and several substituted ketones compound (4-aminoacetophenone,4-chloroacetophenone, isobutyleketone, acetylacetone and acetophenone) to obtain Schiff base products(6b-10b) in ethanol in the presence of concentra

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14

Reddy, Pulimamidi Saritha, P. V. Ananthalakshmi, and V. Jayatyagaraju. "Synthesis and Structural Studies of First Row Transition Metal Complexes with Tetradentate ONNO Donor Schiff Base Derived from 5-Acetyl 2,4-dihydroxyacetophenone and Ethylenediamine." E-Journal of Chemistry 8, no. 1 (2011): 415–20. http://dx.doi.org/10.1155/2011/536269.

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Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) complexes were prepared by template reaction of 5-acetyl 2,4-dihydroxyacetophenone (H2-ADA) and ethylenediamine in the presence of metal ions. The complexes have been characterized on the basis of elemental analyses, conductivity, magnetic moments, infrared and electronic spectral data. The Schiff base binds to metal ions in bis-multidentate ONNO mode leading to two dimensional Schiff base polymers. All the complexes have been assigned octahedral stereochemistry.

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15

Enaam Fadil Mousa. "Modification of vinyl chloride copolymer to Schiff base." journal of the college of basic education 17, no. 72 (2019): 7–11. http://dx.doi.org/10.35950/cbej.v17i72.4492.

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Several new Schiff base derivative were prepared by condensing various aldehydes and ketones (aliphatic and aromatic ) with vinyl chloride copolymer hydrazine in presence of acid catalyst under reflux condition . All the compounds have been characterized on the basis of their softening points ,Viscosity and FT-IR spectral data

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16

Prashanthi, Y., and Shiva Raj. "Synthesis and Characterization of Transition Metal Complexes with." Journal of Scientific Research 2, no. 1 (2009): 114–26. http://dx.doi.org/10.3329/jsr.v2i1.2732.

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The Schiff bases namely MIMFMA, MIMTMA and MIPMA have been prepared by reacting 3-amino-5-methyl isoxazole with 5-methyl furan-2-carboxyaldehyde, 5-methyl thiphene-2-carboxaldehyde and pyridine-2-carboxaldehyde. The Cu(II), Ni(II), Co(II), Zn(II) and VO(IV) have been prepared by reacting metal chlorides with those Schiff bases in an alchololic medium. The complexes are electrolytes in DMSO. These have been characterized by using elemental analysis, IR, UV-VIS, 1H, 13C, mass spectra, magnetic susceptibility, conductance measurements and thermo gravimetric studies. The complexes were found to ha

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17

Buß, Volker, Verena Haas, and Ute Wingen. "Strukturuntersuchungen an chiralen Schiff-Basen des 11-cis-Retinals/Structure Investigation of Chiral Schiff Bases of 11-cis-Retinal." Zeitschrift für Naturforschung B 44, no. 3 (1989): 333–44. http://dx.doi.org/10.1515/znb-1989-0315.

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CD and UV spectra of four chiral 11-cis-retinal Schiff bases obtained by condensing the aldehyde with asymmetric amines are used to gain structural information about the polyene conformation. The spectra are temperature-dependent indicating the same 12-s-cis/trans equilibrium as in 11-cis-retinal. In addition, CD absorptions arise at lower temperatures whose only origin is the inherent dissymmetric nature of the retinylidene Chromophore. CNDO /S-calculations performed on the basis of force-field optimized geometries give results which can partially be rationalized on the basis of experimental

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18

Shaikh, Julekha A. "Synthesis, Spectral Characterization and X–Ray Diffraction Studies of some Pd(II) Complexes with Schiff Bases." International Letters of Chemistry, Physics and Astronomy 36 (July 2014): 272–80. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.36.272.

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The synthesis, spectroscopic and X – Ray Diffraction studies of some Pd(II) complexes with bidentate Schiff bases are reported here. These Schiff bases were derived by condensing aldehydes like 2-hydroxy-1-naphthaldehyde, 5-chloro salicyladehyde with amines like 4-nitro aniline, 4-methyl aniline and 4-methoxy aniline. The complexes were characterized on the basis of elemental analysis, molar conductivity, spectral (IR, 1H and electronic) as well as thermal analysis. All the Pd (II) complexes exhibit square planar geometry with 1:2 (metal : ligand) stoichiometry. The X- ray diffraction studies

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19

Eswaran, Jayanthi. "SYNTHESIS, CHARACTERISATION, THERMAL ANALYSIS AND DNA CLEAVAGE ACTIVITY OF A NOVELZINC (II) COMPLEX OF PYRAZOLE SCHIFF BASES." Kongunadu Research Journal 5, no. 2 (2018): 19–23. http://dx.doi.org/10.26524/krj265.

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A hydrazone Schiff base Zn(II) metal complex is synthesised from the Shiff base ligand Thiophene-2-carboxylic acid hydrazide and 1, 3-diphenyl-1H-pyrazole-4-carboxaldehyde reacted together in 1:1 mole ratio to obtain Schiff base ligand (HL) which was subsequently, allowed to react with Zn(CH3COO)2.2H2O. The Schiff base ligand and its Zn (II) complex prepared were characterized on the basis of elemental nalysis,thermogravimetry, UV-Visible spectroscopy, FT-IR spectroscopy and NMR spectroscopy. IR spectrum of the zinc complex shows that the ligand (HL) is coordinated to the metal ion in monoanio

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20

Ummathur, Muhammed, Radhika Pallikkavil, and Krishnannair Krishnankutty. "Schiff bases of 1,5-diarylpent-4-ene-1,3-diones and their metal complexes: Synthesis, characterization and fluorescent studies." Journal of the Serbian Chemical Society, no. 00 (2020): 62. http://dx.doi.org/10.2298/jsc200520062u.

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Four Schiff bases (H2L1 to H2L4) have been synthesized by the con-densation between o-aminophenol and unsaturated diketones (1,5-diarylpent-4--ene-1,3-diones). Analytical, IR, 1H NMR and mass spectsral data revealed their existence in the imine-enamine form. Dibasic tetradentate coordination of the Schiff bases in their ML complexes [M = Cu(II), Ni(II), Co(II), Zn(II), Cd(II), and Hg(II)] has been established on the basis of physical, analytical and spectral data. The fluorescent studies of H2L4 show that fluorescence emission maxima shift with increase in polarity and hydrogen bonding ability

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21

Isyaku, S., H. N. Aliyu, E. C. Ozoro, and T. Abubakar. "Synthesis, characterization and antimicrobial studies of Mn(II) complexes of acetylthiophene and acetyl Furan Schiff base derivatives." Bayero Journal of Pure and Applied Sciences 12, no. 1 (2020): 85–92. http://dx.doi.org/10.4314/bajopas.v12i1.15s.

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Manganese (II) complexes of Schiff bases; 2-acetylthiophene 4‑phenylthiosemi-carbazone (AT-PTSC) and 2-furylmethylketone-4-phenylthiosemi-carbazone (AF‑PTSC) derived from condensation of 2-acetylthiophene and 2-furylmethylketone (2-acetylfuran) each with 4-phenylthiosemicarbazide in (1:1 molar ratio) ethanol, have been synthesized. The Schiff bases and the Mn(II) complexes were characterized on the basis of melting point/decomposition temperature, solubility, magnetic susceptibility, infrared spectra, molar conductance measurements, elemental and gravimetric analyses. The Mn(II) complexes show

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22

Isyaku, S., H. N. Aliyu, E. C. Ozoro, and T. Abubakar. "Synthesis, characterization and antimicrobial studies of Mn(II) complexes of acetylthiophene and acetyl furan Schiff base derivatives." Bayero Journal of Pure and Applied Sciences 12, no. 1 (2020): 251–58. http://dx.doi.org/10.4314/bajopas.v12i1.39s.

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Manganese(II) complexes of Schiff bases; 2-acetylthiophene-4‑phenylthiosemi-carbazone (AT-PTSC) and 2-furylmethylketone-4-phenylthiosemi-carbazone (AF‑PTSC) derived from condensation of 2-acetylthiophene and 2-furylmethylketone (2-acetylfuran) each with 4-phenylthiosemicarbazide in (1:1 molar ratio) ethanol, have been synthesized. The Schiff bases and the Mn(II) complexes were characterized on the basis of melting point/decomposition temperature, solubility, magnetic susceptibility, infrared spectra, molar conductance measurements, elemental and gravimetric analyses. The Mn(II) complexes show

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23

Sharma, Bharat Prasad, Sarvesh Kumar Pandey, Bishnu Prasad Marasini, Sabita Shrestha, and Motee Lal Sharma. "Oxovanadium(IV) Complexes with Triazole Based Schiff Base Ligands: Synthesis, Characterization and Antibacterial Study." Journal of Nepal Chemical Society 42, no. 1 (2021): 56–63. http://dx.doi.org/10.3126/jncs.v42i1.35332.

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Schiff bases have been synthesized by the reaction of triazole containing primary amine with aromatic carbonyl compounds. The Schiff bases prepared, act as ligand when these are made in contact with oxovanadium (VO2+) ion. Some new mononuclear oxovanadium(IV) complexes have been synthesized by the reaction of Schiff base ligands with vanadyl sulphate (VOSO4.xH2O) and the complexes are analyzed by different spectroscopic methods; [fourier-transform infrared (FTIR), ultraviolet-visible (UV-Vis.), electron paramagnetic resonance (EPR)], X-ray diffraction (XRD) analysis, elemental analysis, and co

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24

Howsaui, Hanan B., Amal S. Basaleh, Magda H. Abdellattif, Walid M. I. Hassan, and Mostafa A. Hussien. "Synthesis, Structural Investigations, Molecular Docking, and Anticancer Activity of Some Novel Schiff Bases and Their Uranyl Complexes." Biomolecules 11, no. 8 (2021): 1138. http://dx.doi.org/10.3390/biom11081138.

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Three novel 2-aminopyrazine Schiff bases derived from salicylaldehyde derivatives and their uranyl complexes were synthesized and characterized by elemental analysis, UV-vis, FTIR, molar conductance, and thermal gravimetric analysis (TGA). The proposed structures were optimized using density functional theory (DFT/B3LYP) and 6–311G ∗(d,p) basis sets. All uranyl complexes are soluble in DMSO and have low molar conductance, which indicates that all the complexes are nonelectrolytes. The DNA binding of those Schiff bases and their uranyl complexes was studied using UV-vis spectroscopy, and screen

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25

Arora Mukesh Sharma, Kishor, Mukesh Sharma, and K. P. Sharma. "Studies of Some Lanthanide(III) Nitrate Complexes of Schiff Base Ligands." E-Journal of Chemistry 6, s1 (2009): S201—S210. http://dx.doi.org/10.1155/2009/149837.

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The studies of 16 new lanthanide(III) nitrate complexes of Schiff base ligands are discussed. Schiff bases were obtained by the condensation of 2–methyl–4–N,N–bis–2' –cyanoethyl aminobenzaldehyde with aniline and 3 different substituted anilines. Lanthanide(III) nitrates,viz. gadolinium(III) nitrate, lanthanum(III) nitrate, samarium(III) nitrate and cerium(III) nitrate were chosen to synthesize new complexes. The complexes were characterized on the basis of physicochemical studiesviz. elemental analysis, spectral,viz. IR and electronic spectral and magnetic studies. TGA studies of some of the

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26

Kudrin, A., A. Zaitsevskii, T. Isaev, D. Maison, and L. Skripnikov. "Towards the Search for Thallium Nuclear Schiff Moment in Polyatomic Molecules: Molecular Properties of Thallium Monocyanide (TlCN)." Atoms 7, no. 3 (2019): 62. http://dx.doi.org/10.3390/atoms7030062.

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Molecular properties of the thallium monocyanide (Tl·CN) system in its ground electronic state are studied using high-precision ab initio relativistic two-component pseudopotential replacing 60 inner-core electrons of Tl. A relativistic coupled-cluster method with single, double and perturbative triple amplitudes is employed to account for electronic correlations. Extrapolation of results to the complete basis set limit is used for all studied properties. The global potential energy minimum of Tl·CN corresponds to the linear cyanide (TlCN) isomer, while the non-rigid isocyanide-like (TlNC) str

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27

Rodlovskaya, E. N., and V. A. Vasnev. "New ferrocense containing tiophene derivatives." Доклады Академии наук 487, no. 6 (2019): 626–29. http://dx.doi.org/10.31857/s0869-56524876626-629.

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A new 2-amino-4-ferrocenyl-thiophene-3-carbonitrile was synthesized by the Gevald reaction and Schiff bases, precursors for new optoelectronic and magnetic materials, were obtained on its basis. The structures of the synthesized compounds were determined by elemental analysis, IR and 1H NMR spectroscopy.

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28

Iyaguchi, Daisuke, Susumu Kawano, Kazuki Takada, and Eiko Toyota. "Structural basis for the design of novel Schiff base metal chelate inhibitors of trypsin." Bioorganic & Medicinal Chemistry 18, no. 6 (2010): 2076–80. http://dx.doi.org/10.1016/j.bmc.2010.02.016.

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Martak, Fahimah, Iin Candrawati, and Ayu Widyasari. "Synthesis, Spectral, Anticancer Studies on Cu (II) Complex of 2,4,5-Triphenyl-1H-Imidazole." Jurnal Kimia VALENSI 2, no. 2 (2016): 91–96. http://dx.doi.org/10.15408/jkv.v2i2.3328.

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Schiff bases of 2,4,5-triphenyl-1H-imidazole ligand and Cu(II) complex has been synthesized and characterized by 1H and 13C NMR, elemental analyses, molar conductance, thermal analysis (TGA), magnetic moment measurement, IR and UV-Vis. On the basis spectral studied and analytical data, it is evident that the Schiff base acts as monodentat ligand coordinating via nitrogen atom. The result showed that Cu(II) complex has octrahedral geometry. The studied complex was tested for anticancer activity. The anticancer activity of Cu(II) complex is evaluated against liver Carninoma (HEPG2) cell lines.

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30

Hodošček, Milan, and Dušan Hadži. "Ab-initio calculations on the retinal Schiff base – formic acid and allylimine – formic acid hydrogen bonds." Canadian Journal of Chemistry 63, no. 7 (1985): 1528–31. http://dx.doi.org/10.1139/v85-260.

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The proton potential functions of Schiff base – formic acid complexes were calculated in the ab-initio scheme with STO-3G and 4-31G basis sets without and with the inclusion of a perturbing charge. The comparison of the curves with the retinal Schiff base and allylimine obtained by using the short base encouraged further calculations with the longer base on the truncated system only. The curve obtained with the 4-31G set on the allylimine – formic acid complex is of a double minimum type with the deeper well still at the formyl oxygen. Inclusion of a perturbing negative charge near the hydroge

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31

Singh, Har Lal, and Jangbhadur Singh. "Synthesis of New Zirconium(IV) Complexes with Amino Acid Schiff Bases: Spectral, Molecular Modeling, and Fluorescence Studies." International Journal of Inorganic Chemistry 2013 (February 21, 2013): 1–10. http://dx.doi.org/10.1155/2013/847071.

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New zirconium(IV) complexes were synthesized with bidentate ligands and characterized by elemental analysis, molar conductance measurements, molecular weight determinations, IR, electronic, NMR (1H and 13C), fluorescence and molecular modeling studies. All the complexes are 1 : 2 electrolytes in nature and may be formulated as [Zr(L)2Cl2] (where L is Schiff bases of amino acids and substituted isatin). The analytical data showed that the Schiff-base ligand acts as bidentate toward zirconium ion via the azomethine nitrogen and carboxylate oxygen. The conductivity values between 8.5–12.6 Ω−1, mo

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32

Razzaq Ibrahim Al-Faris, Ahmed, Wafaa Mahdi Sachit Alkoofee, and . "Cobalt (II) and Nickel (II) Complexes with Schiff Base Ligand Derived From 4-Amino Antipyrine: Synthesis, Spectral, Characterization and Thermal Studies." International Journal of Engineering & Technology 7, no. 4.37 (2018): 198. http://dx.doi.org/10.14419/ijet.v7i4.37.24100.

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Metal complexes of the Schiff base ligand, synthesized via condensation p-dimethylamino benzaldehyde with Bis (4-aminoantipyrine) benzene 1, 4-diamine which has synthesized from condensation 1, 4-phenylene diamine and 4-aminoantipyrine, are synthesized from chloride salts of Co (II) and Ni(II) with ligand in ethanol. The metal complexes and ligand are characterized on the basis of elemental analyses, melting point, molar conductance, UV –Visible, FTIR and thermogravimetric analysis. The molar conductance data reveal that the metal chelates of the ligand with Co (II) and Ni (II) are electrolyte

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33

Mounika, K., A. Pragathi, and C. Gyanakumari. "Synthesis¸ Characterization and Biological Activity of a Schiff Base Derived from 3-Ethoxy Salicylaldehyde and 2-Amino Benzoic acid and its Transition Metal Complexes." Journal of Scientific Research 2, no. 3 (2010): 513. http://dx.doi.org/10.3329/jsr.v2i3.4899.

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A new Schiff base, 3-ethoxy salicylidene amino benzoic acid (ETSAN), has been synthesized from 3-ethoxy salicylaldehyde and 2-amino benzoic acid. Metal complexes of the Schiff base were prepared from nitrate/chloride salts of Ni(II), Co(II) Cu(II) and Zn(II) in an alcoholic medium. The complexes were non-electrolytes in dimethyl sulfoxide solvent (DMSO). The chemical structures of the Schiff-base ligand and its metal complexes were confirmed by various spectroscopic studies like IR, UV-VIS, 1H NMR, 13C NMR, ESI-mass spectra, elemental analysis, molar conductance, thermogravimetric studies and

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34

Sharma, V. K., Ankita Srivastava, and Shipra Srivastava. "Synthetic, structural and antifungal studies of coordination compounds of Ru(III), Rh(III) and Ir(III) with tetradentate schiff bases." Journal of the Serbian Chemical Society 71, no. 8-9 (2006): 917–28. http://dx.doi.org/10.2298/jsc0609917s.

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A series of octahedral Ru(III), Rh(III) and Ir(III) complexes have been prepared with tetradentate Schiff bases derived by condensing isatin with 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane, 1,2-diaminobenzene and 1,3-diaminobenzene. The obtained complexes were characterized on the basis of their elemental analyses, magnetic moment, conductance, IR electronic, 1HNMR and FAB mass spectra, as well as thermal analyses. The Ru(III) complexes are low spin paramagnetic, while Rh(III) and Ir(III) behave as diamagnetic complexes. The IR spectral data revealed that all the Schiff bases beh

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35

E, Jayanthi, and Anusuya M. "SYNTHESIS, CHARACTERISATION, THERMAL ANALYSIS AND DNA CLEAVAGE ACTIVITY OF COPPER PYRAZOLE SCHIFF BASE." Kongunadu Research Journal 5, no. 1 (2018): 23–27. http://dx.doi.org/10.26524/krj247.

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Thiophene-2-carboxylic acid hydrazide and 1, 3-diphenyl-1H-pyrazole-4-carboxaldehyde reacted together in 1:1 mole ratio to form Schiff base ligand(L) which was subsequently, reacted with CUCl2.2H2 Oformed complex of the composition (Cu(L)Cl2). The Schiff base ligand and its Cu(II) complex were characterized on the basis of elemental analysis,thermogravimetry, UV-Visible spectroscopy, FT-IR spectroscopy and NMR spectroscopy. IR spectrum of the copper complex shows that the ligand coordinated through imine nitrogen and amide oxygen atom forming a neutral bidentate chelate with the metal centre.T

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36

Reddy, Vidyavati, Nirdosh Patil, Tukaram Reddy, and S. D. Angadi. "Synthesis, Characterization and Biological Activities of Cu(II), Co(II), Ni(II), Mn(II) and Fe(III) Complexes with Schiff Base Derived from 3-(4-Chlorophenoxymethyl)-4-amino-5-mercapto-1,2,4-triazole." E-Journal of Chemistry 5, no. 3 (2008): 529–38. http://dx.doi.org/10.1155/2008/690535.

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Coordination complexes of Cu(II),Co(II), Ni(II), Mn(II) and Fe(III)with Schiff bases derived from 3-(4-chlorophenoxymethyl)-4-amino-5-mercapto-1, 2, 4-triazole and substituted aldehydes have been synthesized. The complexes were characterized by elemental analysis, conductivity measurements, magnetic susceptibility data, electronic, IR, ESR and1H NMR spectral data. On the basis spectroscopic studies, the Schiff base is monobasic bidentate ligand having the composition ML2(2H2O) Where M = Cu(II), Co(II), Ni(II) ,Mn(II), ML2(H2O)Cl Where M = Fe(III). Various physicochemical data suggest a six coo

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37

Krishnankutty, K., P. Sayudevi, and Basheer Ummathur. "Metal complexes of Schiff bases derived from dicinnamoylmethane and aliphatic diamines." Journal of the Serbian Chemical Society 73, no. 4 (2008): 423–29. http://dx.doi.org/10.2298/jsc0804423k.

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Two new Schiff bases containing olefinic linkages have been synthesized by condensing aliphatic diamines with dicinnamoylmethane under specified conditions. The existence of these compounds predominantly in the intramolecularly hydrogen bonded keto-enamine form was well demonstrated by their IR, 1H-NMR and mass spectral data. Dibasic tetradentate N2O2 coordination of the compounds in their [ML] complexes (M = Ni(II), Cu(II) and Zn(II)) was established on the basis of analytical and spectral data.

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38

SUDHA, A., S. ARULMOZHI та S. J. ASKAR ALI. "Evaluation of α-Amylase Inhibitory Activity, Molecular Modeling, Total Antioxidant and Theoretical Studies of Novel Schiff Base Transition Metal Complexes". Asian Journal of Chemistry 32, № 9 (2020): 2187–94. http://dx.doi.org/10.14233/ajchem.2020.22783.

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By condensing pyrene-1-carbaldehyde and 4-aminoantipyrine, a Schiff base ligand, (Z)-1,5-dimethyl-2-phenyl-4-((pyren-1-ylmethylene)- amino)-1H-pyrazol-3(2H)-one and its Cu(II), Ni(II), Co(II) and Zn(II) complexes have been synthesized. The ligand and its metal complexes were characterized by FT-IR, UV-visible, 1H & 13C NMR, ESI-mass spectra and elemental analysis. The antidiabetic and antioxidant activities of the synthesized Schiff base ligand and its metal complexes were studied. The molecular docking study of human pancreatic α-amylase (PDB: 1HNY). Furthermore, Theoretical analysis of g

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Cordeiro, Giuliano M., Emanoel Hottes, Andressa Esteves-Souza, Guilherme P. Guedes, Carlos Maurício R. de Sant’Anna, and Marcelo H. Herbst. "A Novel ZnII Complex Bearing Two Monodentate (4-Methoxyphenyl)[(1E, 2E)-3-phenylprop-2-en-1-ilidene] Schiff Bases: Crystal Structure and DFT Study." Journal of Chemistry 2019 (February 11, 2019): 1–6. http://dx.doi.org/10.1155/2019/7876495.

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A novel ZnII complex bearing two monodentate (4-methoxyphenyl)[(1E, 2E)-3-phenylprop-2-en-1-ilidene] Schiff bases was synthesized and investigated both in the solid state by single-crystal X-ray diffraction, elemental analysis, and FTIR and in solution by 1H NMR spectroscopy. The complex crystallizes in the P21/c monoclinic space group. The asymmetric unit contains one ZnII ion coordinated to two Schiff base ligands and two chloride ions, in a distorted tetrahedral geometry. The title complex was also investigated by DFT, using the hybrid functional B3LYP with basis set 6-31G++, which reproduc

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Sharma, Anupama, Sarita Khaturia, and Har Lal Singh. "Synthesis of New Schiff Base of 1,3-Oxazine and 1,3-Thiazine Derivatives Derived from 4-Phenyl Substituted Chalcones and Evaluation of their Antibacterial Activity." Asian Journal of Chemistry 33, no. 3 (2021): 531–36. http://dx.doi.org/10.14233/ajchem.2021.23050.

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Oxazine and thiazine heterocycles have distinctive interests due to their important class of natural and non-natural products and exhibit high biological activities in the pharmaceutical and biological fields. This work was planned to synthesize Schiff base of 1,3-oxazine and 1,3-thiazine derivative from 4-phenyl substituted chalcones. The structures of the newly synthesized targeted compounds were established from UV, IR, 1H NMR, 13C NMR and DFT calculations. The molecular properties HOMO-LUMO energy, energy gap, softness and harness were calculated using DFT/B3LYP/6-311G (d,p) basis set. in

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41

Bhanuka, Sunita, Sarita Khaturia, Mamta Chahar, and Har Lal Singh. "Design, Spectroscopic Characterization and Theoretical Studies of Organotin(IV) and Organosilicon(IV) Complexes with Schiff Base Ligands Derived from Amino Acids." Asian Journal of Chemistry 32, no. 11 (2020): 2821–28. http://dx.doi.org/10.14233/ajchem.2020.22850.

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A new series of organotin(IV) and organosilicon(IV) complexes were synthesized using the Schiff base ligands [2-((3,4-dimethoxybenzylidene)amino)-3-(1H-indol-3-yl)propanoic acid (L1H) and 2-((3,4-dimethoxybenzylidene)amino)-3-methylbutanoic acid (L2H)]. The synthesized compounds were characterized by IR, NMR (1H and13C), elemental analysis and theoretical studies. The molar conductivity values of the complexes in DMF implied the presence of non-electrolyte species. Spectral data showed that in these complexes the metal atoms are coordinated with the Schiff base ligand acts as a bidentate ON mo

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42

More, Paresh S., and Bipin H. Mehta. "¹H NMR, Diffused Reflectance, Thermal Studies, ESR and Anti Microbial Activities of Schiff Base Derived from 5-Nitro Salicylaldehyde and p-Anisidine." International Letters of Chemistry, Physics and Astronomy 48 (March 2015): 14–26. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.48.14.

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Transition metal complexes of the type ML1 [Where M= Co(II),Ni(II),Cu(II) and Zn(II), L= Schiff base of 5 nitro-salicylaldehyde and p-anisidine were characterized by using 1H NMR, TGA, Diffused reflectance and ESR spectroscopy. On the basis of above studies Co(II), Ni(II) shows tetrahedral structure, Cu(II) and Zn(II) shows square planar structure.

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43

Agnihotri, Sonal, and Kishor Arora. "Physicochemical Investigations of Th(IV) and UO2(VI) Complexes with New Schiff Bases Along with their Toxic Effects." E-Journal of Chemistry 7, no. 3 (2010): 1045–54. http://dx.doi.org/10.1155/2010/859034.

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Schiff bases were obtained usingp-trimethoxy benzaldehyde,p-hydroxyl benzaldehyde and 2-amino pyridine to prepare new complexes of thorium(IV) and dioxouranium(VI) metals by various anions. The synthesized ligands and complexes were analytically studied through spectral studies, elemental analysis conductance measurements along with semi empirical and thermogravimetric methods. The complexes were assigned various coordination numbers ranging from 6-10 on the basis of these studies.

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44

More, Paresh S., and Bipin H. Mehta. "Structural Elucidation of Transition Metal Complexes of the Schiff Base of 5-Nitro Salicylaldehyde and Anthranalic Acid Using ¹H NMR, Thermal Analysis, Diffused Reflectance and ESR Data." International Letters of Chemistry, Physics and Astronomy 48 (March 2015): 1–13. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.48.1.

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Transition metal complexes of the type ML.nH2O [Where M= Co(II),Ni(II),Cu(II) and Zn(II), L= Schiff base of 5 nitro salicylaldehyde and anthranalic acid, n= 0,1 …..] were characterized by using 1H NMR,TGA, Diffused refluctance and ESR spectroscopy. On the basis of above studies Co(II), Ni(II) shows tetrahedral structure, Cu(II) shows binuclear structure and Zn(II) shows square planar structure.

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45

Jean -Noël uppiah, Dany, Minu Gupta Bhowon, and sabina Jhaumeer Laulloo. "Solventless Synthesis of Imines Derived from Diphenyldisulphide Diamine or p-Vanillin." E-Journal of Chemistry 6, s1 (2009): S195—S200. http://dx.doi.org/10.1155/2009/636707.

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A solventless synthesis can reduce environmental contamination and can be more convenient than solvent-based synthesis. A series of Schiff bases were synthesized in high yield > 90% under solvent free conditions with negligible waste. All the synthesized products were characterized on the basis of spectral, elemental analysis and melting points and were compared with the data of the prouducts obtained from classical method

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46

Magtoof, Zainab Ryad, and Mahmood Shakir Magtoof. "Synthesis and Characterization of Some 4- Substituted Thiazolidinone Derivatives." INTERNATIONAL JOURNAL OF PHARMACEUTICAL QUALITY ASSURANCE 10, no. 04 (2019): 631–36. http://dx.doi.org/10.25258/ijpqa.10.4.12.

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This study is concerned with the synthesis and characterization of 4-thiazolidinone derivatives (3a-3e). These compounds were prepared by reacting mercaptoacetic acid with the appropriate Schiff bases (imines) by heating at 50-60 °C in chloroform with moderate yields (51- 75 %). The structures of these 4-thiazolidinone derivatives were established on the basis of spectral studies using IR, 1H-NMR, 13C-NMR, and13C-NMR DEPT .

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47

Singh, Har Lal, and J. B. Singh. "Synthesis and Characterization of New Lead(II) and Organotin(IV) Complexes of Schiff Bases Derived from Histidine and Methionine." International Journal of Inorganic Chemistry 2012 (February 8, 2012): 1–7. http://dx.doi.org/10.1155/2012/568797.

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New Schiff base (HL) ligand is prepared via condensation of isatins and amino acids in 1:1 molar ratio. Metal complexes are prepared and characterized by elemental analysis, molar conductance, electronic, infrared, and multinuclear magnetic resonance (1H NMR, 13C NMR, and 119Sn NMR). The analytical data showed that the ligand acts as bidentate toward metal ions via azomethine nitrogen and carboxylate oxygen by a stoichiometric reaction of metal : ligand (1 : 2) to from metal complexes (Pb(II)(L)2 and Bu2Sn(L)2, where L is the Schiff base ligands of histidine and methionine). The conductivity v

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48

Reiss, Aurora, Nicoleta Cioateră, Aurelian Dobrițescu, et al. "Bioactive Co(II), Ni(II), and Cu(II) Complexes Containing a Tridentate Sulfathiazole-Based (ONN) Schiff Base." Molecules 26, no. 10 (2021): 3062. http://dx.doi.org/10.3390/molecules26103062.

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New Co(II), Ni(II), and Cu(II) complexes were synthesized with the Schiff base ligand obtained by the condensation of sulfathiazole with salicylaldehyde. Their characterization was performed by elemental analysis, molar conductance, spectroscopic techniques (IR, diffuse reflectance and UV–Vis–NIR), magnetic moments, thermal analysis, and calorimetry (thermogravimetry/derivative thermogravimetry/differential scanning calorimetry), while their morphological and crystal systems were explained on the basis of powder X-ray diffraction results. The IR data indicated that the Schiff base ligand is tr

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Venkittapuram, Palaniswamy, Mahalakshmi Dhandapani, Jonekirubavathy Suyambulingam, and Chitra Subramanian. "Synthesis, characterization, thermal, theoretical and antimicrobial studies of Schiff base ligand and its Co(II) and Cu(II) complexes." Journal of the Serbian Chemical Society 85, no. 2 (2020): 215–25. http://dx.doi.org/10.2298/jsc181128049v.

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A Schiff base ligand L was synthesized by condensation of 1,2-diaminoethane with creatinine. The reaction of the ligand with metal chloride salt gives Co(II) and Cu(II) complexes. The synthesized ligand and its metal complexes were characterized by elemental analysis, FT-IR, NMR, UV?Vis, conductivity and magnetic susceptibility measurements as well as thermal analyses. Based on spectral data, tetrahedral geometries have been proposed for the Co(II) and Cu(II) complexes. The molar conductivity data show that the complexes are non-electrolytic in nature. In DFT studies, the geometry of the Schif

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Al-Mudhafar, May M. Jawad, Rana A. Kamoon, and Tagreed N.-A. Omar. "Synthesis, Characterization and Antimicrobial Evaluation of New Azo Compounds Derived from Sulfonamides and Isatin Schiff Base." International Journal of Drug Delivery Technology 10, no. 01 (2020): 150–55. http://dx.doi.org/10.25258/ijddt.10.1.26.

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The present study deals with the synthesis of four different azo-azomethine derivatives; this is done by two steps; the first step is diazotization of sulfonamides (sulfanilamide, sulfacetamide, sulfamethoxazole, and sulfadiazine) separately, followed by the second step; the coupling reaction of diazotized compounds with isatin bis-Schiff base named 3-((4-nitrobenzylidene) hydrazono)indolin-2-one. The later one (bis-Schiff base) was synthesized by the reaction of 3-hydrazono-indolin-2-one with p-nitrobenzaldehyde. The chemical structures of newly synthesized compounds were approved on the basi

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