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Academic literature on the topic 'Bases de Schiff'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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Journal articles on the topic "Bases de Schiff"

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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 (September 30, 2020): 263–72. http://dx.doi.org/10.37547/tajas/volume02issue09-37.

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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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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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Golovanov, A. S., M. M. Murza, and M. G. Safarov. "Novel mesomorphic Schiff bases." Chemistry of Heterocyclic Compounds 33, no. 11 (November 1997): 1350–51. http://dx.doi.org/10.1007/bf02320340.

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İspir, E., and S. Serin. "New immobilized Schiff bases." Journal of Thermal Analysis and Calorimetry 94, no. 1 (August 12, 2008): 281–88. http://dx.doi.org/10.1007/s10973-007-8900-3.

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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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A, Kumar. "Synthesis of some new Schiff bases of Pharmaceutical Interest." Annals of Advances in Chemistry 1, no. 2 (2017): 053–56. http://dx.doi.org/10.29328/journal.aac.1001006.

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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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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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Maji, Biplab, and Herbert Mayr. "Nucleophilic Reactivities of Schiff Bases." Zeitschrift für Naturforschung B 68, no. 5-6 (June 1, 2013): 693–99. http://dx.doi.org/10.5560/znb.2013-3085.

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The nucleophile-specific parameters N and sN, as defined by the linear free energy relationship log k = sN(N+E) (J. Am. Chem. Soc. 2001, 123, 9500 - 9512), were determined for five imines 1a-e by studying the kinetics of their reactions with benzhydrylium ions in dichloromethane solution at 20 °C. These parameters allowed us to include representative Schiff bases into our comprehensive nucleophilicity scale and compare their reactivities with those of other N-nucleophiles

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Dissertations / Theses on the topic "Bases de Schiff"

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Wojciechowski, Paul E. "Electrochemistry of oxorhenium(V) Schiff base complexes." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/25988.

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Machado, Vanderlei Gageiro. "Catalise cationica na hidrolise de bases de Schiff." reponame:Repositório Institucional da UFSC, 1992. http://repositorio.ufsc.br/xmlui/handle/123456789/76823.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina. Centro de Ciencias Fisicas e Matematicas
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A reação de hidrólise das bases de Schiff N-benzildenoanilina, 4-metóxi-N-benzilidenoanilina, 2-metóxi-N-benzilidenoanilina e 2-(2-etoxi)etóxi-N-benzilidenoanilina foi estudada a 25oC, na presença de sais de metais alcalinos e alcalino-terrosos em diversas concentrações. A força iônica foi mantida constante no meio etanólico aquoso (88%) através da adição de tetrafluoroborato de tetrabutilamônio. Os resultados foram explicados em termos de três fatores: a) o efeito inibitório da complexação do íon metálico com o átomo ligado ao anel; b) o efeito provocado pela associação do cátion com o átomo de nitrogênio imínico; c) o efeito templato, envolvendo a associação do íon metálico com os átomos de oxigênio da cadeia lateral.

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Potgieter, Kim Carey. "Complexes of the ReO³⁺/Re(CO)₃cores with multidentate N,O-Donor chelates." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1225.

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This study investigates the coordination modes of multidentate N,O-donor ligands toward the [ReVO]3+ and fac-[ReI(CO)3]+ cores. The reactions of trans-[ReOX3(PPh3)2] (X = Cl, Br) with 4-aminoantipyrine (H2pap) were studied, and the complexes cis-[ReX2(pap)(H2pap)(PPh3)](ReO4) were isolated. The X-ray crystal structures show that both complexes display a distorted octahedral geometry around the central rhenium atom, and are mirror images of each other. The ligand pap is coordinated monodentately through the doubly deprotonated amino nitrogen as an imide, and H2pap acts as a neutral bidentate chelate, with coordination through the neutral amino nitrogen and the ketonic oxygen. The attempted synthesis of the potentially hexadentate Schiff base ligand 1,2-bis(2-{(Z)- [(2-hydroxyphenyl)imido]methyl}phenoxy)benzene from the condensation reaction of 2- (2-((2-aminophenoxy)methyl)benzyloxy)benzenamine and salicylaldehyde produced the zwitterion derivative (H2ono) of 2-{(Z)-[2-(hydroxyphenyl)imino]methyl}phenol. The tridentate Schiff bases (Z)-2-(2-aminobenzylideneamino)phenol (H3onn) and (Z)-2-(2- (methylthio)benzylideneamino)phenol (Hons) were prepared in a similar manner. The reaction of H2ono with trans-[ReOBr3(PPh3)2] surprisingly led to the isolation of the rhenium(III) complex [ReBr(PPh3)2(ono)], in which ono acts as a dianionic tridentate ligand. The reaction of H3onn with trans-[ReOBr3(PPh3)2] produced the imidorhenium(V) complex salt [ReBr(PPh3)2(onn)]Br, in which onn is coordinated as a trianionic tridentate imidoiminophenolate. The reaction of Hons with [Re(CO)5Br] led to the further decomposition of the Hons ligand, and the rhenium(I) product fac- [Re(CO)3(ons)(Hno)] (Hno = 2-aminophenol) was isolated, with ons coordinated as a monoanionic bidentate chelate (with a free SCH3 group), and Hno present as a neutral monodentate ligand with coordination through the amino nitrogen atom. Abstract Nelson Mandela Metropolitan University vi The reactions of the potentially hexadentate ligand N,N’-{ethane-1,2- diylbis[nitrilomethylidenebenzene-1,2-diyl]}bis(2-aminobenzeneimine) (H2ted) with rhenium(V) starting materials resulted in the decomposition of the H2ted molecule to give different coordinated multidentate ligands coordinated to the rhenium(V) centers. In the reaction of H2ted with trans-[ReOBr3(PPh3)2] in ethanol, the highly unusual ‘3+3’ complex cation [Re(tnn)(Htnn)]Br2 was isolated, in which tnn is coordinated as a tridentate imido-imino-amine, and Htnn is present as a tridentate monoanionic amidoimino- amine chelate (H2tnn = N-(2-aminophenylmethylidene)ethane-1,2-diamine). With trans-[ReO2(py)4]Cl as starting material, the neutral complex [ReO(dne)] was found, in which the tetradentate chelate dne acts as a triamido-imine. The reaction of cis- [ReO2I(PPh3)2] with H2ted led to the formation of the monocationic complex salt [ReO(ane)]PF6, with ane acting as a tetradentate dianionic diamidodiimine (H2ane = N,N’-bis[(2-aminophenyl)methylidene] ethane-1,2-diamine). The seven-coordinate rhenium(III) complex cation [Re(dhp)(PPh3)2]+ (H2dhp = 2,6-bis(2- hydroxyphenyliminomethyl)pyridine) was isolated as the iodide salt from the reaction of cis-[ReO2I(PPh3)2] with H2dhp in ethanol and as the perrhenate salt from the reaction of trans-[ReOBr3(PPh3)2] with H2dhp in methanol. Both products result from a disproportionation reaction with perrhenate also being produced in the process. The complex fac-[Re(CO)3(H2dhp)Br] was prepared from [Re(CO)5Br] and H2dhp in toluene, where the H2dhp ligand acts as a neutral bidentate NN-donor chelate. The metal is coordinated to three carbonyl donors in a facial orientation, to a neutral imino nitrogen, a pyridinic nitrogen and a bromide.

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Low, May Lee. "Synthèse, caractérisation et bioactivité de ligands issus de bases de Schiff dérivées de dithiocarbazate et de leurs complexes métalliques." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066148/document.

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Il y a de nos jours un besoin urgent de découvrir de nouveaux médicaments pour relever le défi de la multirésistance dans le traitement des infections bactériennes et le cancer. Dans cette perspective, des bases de Schiff dérivées de dithiocarbazates et leurs complexes métalliques correspondants sont des candidats intéressants puisqu'ils peuvent être facilement synthétisés et permettent une grande diversité de coordination. Dans cette étude, des complexes tetradentes et bidente ont été préparés. Les ligands et complexes synthétisés ont été entièrement caractérisés par différentes méthodes spectroscopiques et physico-chimiques dans le solide et en solution. L'activité antibactérienne de ces complexes a ensuite été étudiée et a permis de sélectionner un complexe " leader " (plus efficace, stable et fonctionnalisable). Ce complexe a alors été modifié afin d'augmenter sa stabilité en milieux biologique, sa solubilité dans l'eau ainsi que son activité. Il a été conjugué avec différentes entités : des peptides pénétrants, un polyéthylène glycol (PEG) et un peptide inhibiteur des pompes d'efflux bactériennes. Ces complexes ont montré une remarquable activité antibactérienne sur neuf souches de bactéries Gram-positives et Gram-négatives et en particulier, ils se sont avérés très efficaces contre S.aureus. L'activité anti-cancéreuse des complexes non-conjugués a également été étudiée et les complexes de cuivre sélectionnés et testés sur des cellules de cancer du sein ont montré une cytotoxicité élevée. Ceci met en évidence la pertinence d'utiliser les complexes métalliques, pour à la fois stabiliser les ligands et générer des composés plus actifs
There is an urgent need to discover new drugs with novel mechanisms of action, higher activity and improved selectivity to address the severe challenge of multidrug resistance in treating bacterial infections and cancer. In view of this, Schiff bases derived from S-substituted dithiocarbazate and their corresponding metal complexes with a plethora of potentially exciting biological activities and coordination chemistry are attractive candidates. Metal complexes of tetradentate NNSS and bidentate NS ligands have been prepared. The compounds were fully characterized with various physico-chemical and spectroscopic methods in solution and solid state. Conjugation of the most promising antimicrobial compound to various moities (polyarginine, polyethylene glycol (PEG) and an bacterial efflux pump inhibitor) was achieved to prepare improved therapeutic agents. The nanoarginines (R9) derivatives showed the most encouraging synergistic effect upon conjugation and complexation to copper ion with enhanced water solubility, bacteria cell membrane permeability and bioactivity. The Cu(II) R9 derivatives possess remarkable antibacterial activity against a wide spectrum of bacteria and in particular, highly efficacious against S. aureus. This show that the conjugation of polyarginine to dithiocarbazate compounds can greatly influence their therapeutic potential. Cytotoxic assay was also carried out for selected non-conjugated compounds. All the selected Cu(II) complexes assayed against breast cancer cells lines exhibited good cytotoxicity. This work highlights the relevance of the strategy that consists of using metal complexes to stabilize the ligands and improve their bioactivity

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Lo, Wing Kit. "Synthesis, characterization and luminescent properties of mono- and bi-metallic Schiff base complexes." HKBU Institutional Repository, 2004. http://repository.hkbu.edu.hk/etd_ra/585.

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Sobola, Abdullahi Owolabi. "Synthesis, characterization and antimicrobial activity of copper (II) complexes of some hydroxybenzaldimines and their derivatives." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1016258.

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This study focuses on the antimicrobial activity of Cu(II) complexes of some orthohydroxybenzaldimines and its derivatives. Four different categories of Schiff base ligands were prepared by condensing salicylaldehyde, o-vanillin, p-vanillin and vanillin with p- and osubstituted anilines; 1-aminonaphthalene; 2- and 3-aminopyridine; 2- and 3- aminomethylpyridine as well as 2-aminobenzimidazole. The last category was prepared from ophenylenediamine and o-vanillin. The Schiff base ligands have been characterized by a combination of elemental analysis and spectral (¹H- and ¹³C-NMR, UV/Visible, infrared and Raman) data. The existence of strong intramolecular hydrogen bonding in the orthohydoxybenzaldimines was evident from the chemical shift values of the hydroxyl proton in the ¹H-NMR spectra of the Schiff base ligands. The hydroxyl proton resonates at high frequency and thus absorbed far downfield at 13.46-11.83 ppm, reflecting the presence of hydrogen bonding between the hydroxyl proton and the imine nitrogen. In the p-substituted aniline analogues of the Schiff base, a plot of the chemical shift values of the hydroxyl proton against the Hammett's substituent parameters gave a linear correlation between the electronegativities of the substituents and the chemical shift values. The nitro group with the highest electronegativity caused the least deshielding of the hydroxyl proton and thus absorbed upfield compared to the less electronegative substituents such as the CH3 and OCH3 analogues. Likewise, in the solid state infrared spectra of the ligands, the hydroxyl stretching band of the ortho-hydroxyl Schiff base ligands was observed as a very broad band and at much lower frequency, 3100-2100 cm⁻¹, indicating the existence of strong intramolecular hydrogen bonding. In the same vein, ¹H- and ¹³C-NMR spectral data for the Schiff base ligands indicated that the prepared compounds exist in the enol form in aprotic solvent, chloroform. The methine proton appeared as singlet and there was no carbonyl signal in the ¹³C-NMR spectra of the Schiff base ligands. This was supported by the infrared data having no vibrational band attributable to the carbonyl stretching of the keto-form of the Schiff base ligands in solid state. However, the UV/Visible study of the Schiff base ligands in protic solvent, methanol, suggested the existence of some of the Schiff base ligands in keto-enol form. A band at greater than 400 nm was observed in the UV/Visible spectra of the ligands and this has been attributed to the presence of the keto form of orthohydroxyl Schiff base ligands in solution. A plot of the molar absorptivity (ε) of the band at greater than 400 nm against Hammett substituent parameters revealed that the intensity of the bands increased with the electronegativity of the substituents. The Cu(II) complexes of salicylaldehyde, o-vanillin and a few p-vanillin based Schiff base ligands are reported in this work. It was observed that introduction of Cu(II) ions into the ligand system resulted in the hydrolysis of the imine band in few cases. All the isolated complexes have been characterized by elemental analysis, conductivity measurement, infrared and UV/Visible spectral data. The structures of three of the Cu(II) complexes were further confirmed by X-ray single crystal diffraction. The Schiff base ligands either coordinated as neutral base through the imine nitrogen or via the imine nitrogen and the phenolic oxygen atoms. In addition, the benzimidazole-based and ovan-2-pico analogues equally coordinated through the imidazole N-3 nitrogen and the azine nitrogen respectively; thus acted as tridentate. In general, the synthesized Cu(II) complexes fell into seven categories viz: [Cu(LH)Cl(H₂O)]Cl; [Cu(LH)₂Cl₂].xH₂O; [CuL₂]; [Cu₂L₂]; [Cu(LH)Cl(H₂O)]Cl; and [MLCl]. The Cu(II) complexes of the form, M(LH)₂Cl₂.xH₂O were either 1:1 or non-electrolyte in methanol and DMF. The third category, CuL₂, was however, non-electrolyte existing as neutral four coordinate Cu(II) complexes. X-ray single crystal structure of Cu(II) complexes derived from the ammonia-based Schiff bases revealed a square planar geometry for the complexes and this agreed with the planar geometry that has been reported for Cu(II) complexes of N-arylsalicylaldimines of the type studied in this work. The complexes, [Cu₂L₂], resulted from the ortho-hydroxyaniline analogues and were polymeric with the Schiff base ligands coordinating to the Cu(II) ions as tridentate dibasic via the imine nitrogen, phenolic oxygen and the aminophenolic oxygen atoms. Cu(II) complexes prepared from ovan-2-ampy and ovan-2-pico Schiff bases were of the forms [Cu(LH)Cl(H₂O)]Cl and [CuLCl] respectively. The X-ray crystal structure of [Cu(ovan-2- pico)Cl] revealed a four-coordinate square planar geometry for the complex. In the same vein, the o-phenylenediamine complexes were of the form [Cu(L)(H₂O)], with the X-ray crystal structure of [Cu(bis-ovanphen)(H₂O)] revealing a square pyramidal geometry. The Schiff base ligands and the isolated Cu(II) complexes have been evaluated for their antimicrobial activity against three bacterial strains (Escherichia coli ATCC® 8739™*, Staphylococcus aureus subsp. aureus ATCC® 6538™* and Bacillus subtilis subsp. spizizeni ATCC® 6633™*) and one fungal strain, Candida albicans ATCC® 2091™*, using agar disc diffusion and broth dilution techniques. It was observed that the presence of the methoxyl group at the ortho-position of the aldehyde moiety of the Schiff base ligands enhanced the activity of the ligand tremendously and thus the o-vanillin analogues showed the highest potency against the tested organisms. In addition, the hydroxyaniline analogues were equally the most promising of all the substituted aniline based Schiff bases. The o-vanillin analogues of the aminopyridines and aminomethylpyridines also exhibited significant activity against the tested organisms. All the 2-aminobenzimidazole series were active against the tested organisms. It should be noted that E. coli was the least susceptible of all the microorganisms while the highest potency was exhibited against the fungus of choice, Candida albicans. Lastly, chelation of the Schiff base ligands with Cu(II) ions did not have significant influence on the activity of the free ligands.

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Araújo, Eliene Leandro de. "Preparação e caracterização de bases de Schiff e complexos metálicos a partir de quitosana e derivados de salicilaldeído." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-29062015-154801/.

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Bases de Schiff biopoliméricas à base de quitosana foram preparadas a partir do salicilaldeído e de seus derivados substituídos na posição 5 do anel aromático do salicilaldeído (5-bromo, 5-cloro, 5-metil, 5-metóxi e 5-nitrosalicilaldeído), utilizando condições de síntese otimizadas para aumentar o grau de substituição (GS). Durante a caracterização das bases foram observados GS (%) = 78,7; 51,3; 43,7; 28,1; 22,1 e 17,5, respectivamente para os derivados 5-metóxi, salicilaldeído, 5-nitro, 5-cloro, 5-metil e 5-bromo, tendo sido as diferenças atribuídas ao caráter indutivo e de ressonância de cada um dos grupos substituintes. A partir desses ligantes foram sintetizados os complexos de cobre (II) e níquel (II) com quitosana e todas as bases de Schiff biopoliméricas. A quitosana, os ligantes e os complexos foram caracterizados por espectroscopia vibracional na região do infravermelho com transformada de Fourier (FTIR) e técnicas termoanalíticas (termogravimetria, TG; termogravimetria derivada, DTG e análise térmica diferencial, DTA). A quitosana utilizada apresentou grau de desacetilação, GD = 75,6%, determinado por 1H RMN, e apresentou as bandas características para estes biopolímeros nos espectros FTIR e decomposição térmica em dois eventos exotérmicos, após desidratação. As curvas TG/DTG-DTA das bases revelaram que estas são menos estáveis que a quitosana de partida e a estabilidade mostrou-se mais uma função da natureza do ligante do que do GS. A partir das curvas TG e dos valores de GS foi possível prever a composição das bases em concordância com os dados de análise elementar. Os complexos mostraram coordenação com os átomos de oxigênio do anel aromático dos aldeídos e do nitrogênio imínicos, com base nos espectros FTIR, sendo os complexos de cobre aparentemente mais fortes que os de níquel, se considerados os deslocamentos nas frequências de vibração das ligações C=N e C-Ofen. Os complexos de cobre (II) e níquel (II) também apresentaram decomposição em duas etapas, após desidratação, tendo sido a primeira etapa observada em temperaturas inferiores às das bases. Em alguns casos foi possível observar que os processos de decomposição se dividem, sugerindo decomposição diferenciada para regiões do biopolímero contendo o complexo e aquelas não modificadas, pois tal fenômeno ocorreu principalmente nos complexos derivados das bases com menor GS. Os resíduos de decomposição desses complexos foram CuO e NiO, de acordo com difratogramas de raios X, cujos teores permitiram calcular a quantidade de metal presente em cada complexo, e concluir que praticamente todos os sítios contendo as bases biopoliméricas foram complexadas em ambos os casos.
Biopolymeric Schiff bases were prepared from chitosan and salicylaldehyde and its 5-bromo, 5-chloro, 5-methyl, 5-methoxy and 5-nitro derivatives, under conditions optimized to improve the degree of substitution (DS). From 1H NMR data, DS (%) = 78.7, 51.3, 43.7, 28.1, 22.1 and 17.5, for 5-methoxy, salicylaldehyde, 5-nitro, 5-chloro, 5-methyl, and 5-bromo derivatives, respectively. The differences had been attributed to inductive and resonance effects of each substituent. From these ligands, copper (II) and nickel (II) complexes were synthesized with chitosan and all the biopolymeric Schiff bases. Chitosan, ligands and complexes were characterized by Fourier transform vibrational spectroscopy in the infrared region (FTIR) and thermal analytical techniques (thermogravimetry, TGA; derivative thermogravimetry, DTG and differential thermal analysis, DTA). Chitosan presented a deacetylation degree, DD = 75.6%, determined by 1H NMR, presenting the characteristic bands of this biopolymer in the FTIR spectra as well as decomposition in two exothermic steps after dehydration. TGA/DTG and DTA curves of the bases revealed that they are less stable than chitosan. This stability is closely related to the nature of substituent than the DS. From TGA curves and DS values it was possible to calculate the bases composition which agreed with elemental analysis data. Complexes presented coordination via oxygen atom of aldehydes aromatic rings and the iminic nitrogen, based on the FTIR results, being the copper (II) complexes apparently stronger the those from nickel (II), if one consider the displacements in the vibration frequencies of the C=N and C-Ophen bonds. The copper (II) and nickel (II) complexes also presented decomposition in two steps after dehydration, being the first step observed in lower temperatures when compared to those of the free bases. In some cases it was possible to observe that the decomposition steps in the DTG curves are split suggesting different decomposition for regions of the biopolymer in which the complexes is present and for the unmodified ones, once such phenomena occurred mainly in complexes derived from the bases with lower DS. The residues of decomposition for such complexes were CuO and NiO, according to X-ray diffractograms and their contents permitted to calculate the amount of each metal present in the complex leading to conclude that almost all the sites containing the Schiff bases on the biopolymeric matrix was complexed in both cases.

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Liu, Xiang. "Nanomatériaux à base d'éléments de transition tardifs pour la catalyse de réactions "click" et impliquant des liaisons carbone-azote." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S113/document.

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La conception et la synthèse de nanomatériaux à base d'éléments de transition tardifs est d’un intérêt considérable pour des applications potentielles respectueuses de l’environnement en nanomédecine, pour la reconnaissance moléculaire, dans le domaine des capteurs, et en catalyse. Onze différents types de nanoparticules de métaux de transition (TMNPs) stabilisées par des dendrimères ont été synthétisées et caractérisées. Ces nanomatériaux ont été employés en tant que catalyseurs dans des réactions ''click'' et de réduction du nitrophénol en aminophénol dans le but d’établir une relation entre leurs activités catalytiques et la localisation de la nanoparticule qui peut être totalement ou partiellement encapsulée par le dendrimère. Par ailleurs, un complexe moléculaire base de Schiff organométallique de Cu(II) et le métallopolymère correspondant résultant de son greffage sur une matrice PMMA ont été préparés et utilisés comme précatalyseurs efficaces de réactions de cycloaddition [3+2] d’azotures organiques avec des alcynes terminaux. De plus, le dérivé supporté a été recyclé au moins trois fois sans perte d’activité ni de cuivre. Une réaction sélective de N-alkylation d’amines par des alcools en utilisant Pd/C comme catalyseur recyclable a également été développée
The design and synthesis of late transition-metal nanomaterials is of considerable interest towards applications in nanomedicine, molecular recognition, sensing and catalysis under environmentally friendly conditions. Eleven different kinds of dendrimer-stabilized TMNPs have been synthesized and characterized. They were employed as catalysts for “click” and 4-nitrophenol reduction reactions, to study the relationship between their catalytic activities and their ''inside vs. partly outside'' dendrimer localization. On the other hand, a new ferrocenyl-containing unsymmetrical CuII-Schiff-base complex, and its covalently poly(methyl) (methacrylate) (PMMA)-grafted counterpart were synthesized and employed as efficient precatalyst in the CuAAC “click reaction. The PMMA-supported catalyst has been reused at least three times without any lost of activity or copper leaching. A selective NAlkylation reaction of amines with alcohols using Pd/C as an efficient and reusable catalyst has also been developed

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9

Tozzo, Érica. "\"Estudo experimental e teórico de compostos de bases de Schiff com cobre (II)\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-05062007-162938/.

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Neste trabalho inicialmente foi feita uma breve apresentação sobre a utilização de compostos de bases de Schiff e Cobre(II) como catalisadores na reação de oxidação de sulfetos. Foi feita a determinação das estruturas cristalinas dos compostos: N,N\'-bis(3-etoxisalicilideno)-(1,2etileno- diamina) Cu(II), sistema cristalino ortorrômbico grupo espacial Pbcn a = 7.639(5); b= 12.760(5); c= 19.733(5)Å; V = 1923.4(15) (3)Å3; Dcalc = 1.505 Mg/m3; MM = 435.96; e m = 1.170 mm-1, N,N\'-bis (4-dietilaminasalicilideno) - (1,2etilenodiamina) Cu(II), sistema monoclínico, C2/c, a = 19.571(2); b=9.8514(2)=; c=12.4552(4) Å; Beta = 93.705(9)o; V =2396.4(5) Å3; Dcalc=1.358 Mg.m-3; MM= 490.10; e m = 0.944 mm-1, N,N\'-bis(3-metoxisalicilideno)-(1,2etilenodiamina)Cu(II), sistema ortorrômbico, Pna21, a = 7.5140(6); b= 9.2629(9); c= 24.721(3)Å; V =1720.6(3) Å3; Dcalc = 1.575 Mg,m-1; MM = 407.91; e m = 1.302 mm1 e (SALAHE)Cu(II), monoclínico, P21/C, a = 18.3216(2) Å; b=4.804(3) Å; c=19.801(2)Å; Beta = 98.908(6)o; V =2396.4(5) Å3; Dcalc=1.358 Mg.m-3; MM= 490.10; e m = 0.944 mm-1. Os cálculos teóricos para as quatro moléculas foram efetuados partindo-se das coordenadas atômicas cristalográficas. Foram modeladas, para posterior estudo teórico, as moléculas de vinte e seis compostos de bases de Schiff e Cobre(II) análogos. Foram calculadas 104 variáveis para cada composto, e realizado o estudo de correlação estrutura-atividade catalítica através de métodos de Quimiometria. Foi obtido um modelo de correlação utilizando a classe de compostos de atividade catalítica pré-definida. Finalmente foi realizada a tentativa de previsão de atividade dos vinte e quatro compostos com atividade não conhecida, obtendo-se como resultado a probabilidade de vinte deles serem ativos como catalisadores da conversão sulfeto-sulfóxido .
Initially, in this work, a brief presentation about Schiff bases and their applications as catalysist. The crystalline structure determination was made for the compounds: N,N\'-bis(3-etoxysalicylidene)- (1,2ethylenediamine) Cu(II), crystal system orthorhombic spatial group Pbcn a = 7.639(5); b= 12.760(5); c= 19.733(5)Å; V = 1923.4(15) (3)Å3; Dcalc = 1.505 Mg/m3; MM = 435.96; e m = 1.170 mm-1, N,N\'-bis (4- diethylaminesalicilidene) - (1,2ethylenediamine) Cu(II), monoclinic, C2/c, a = 19.571(2); b=9.8514(2)=; c=12.4552(4) Å; B= 93.705(9)o; V =2396.4(5) Å3; Dcalc=1.358 Mg.m-3; MM= 490.10; e m = 0.944 mm-1, N,N\'-bis(3-metoxysalicilidene)- (1,2ethylenediamine) Cu(II), orthorhombic, Pna21, a = 7.5140(6); b= 9.2629(9); c= 24.721(3)Å; V =1720.6(3) Å3; Dcalc = 1.575 Mg,m-1; MM = 407.91; e m = 1.302 mm1 e (SALAHE)Cu(II), monoclinic, P21/C, a = 18.3216(2) Å; b=4.804(3) Å; c=19.801(2)Å; B= 98.908(6)o; V =2396.4(5) Å3; Dcalc=1.358 Mg.m-3; MM= 490.10; e m = 0.944 mm-1. The theoretical calculations for the four molecules had been effected starting of the crystallographic atomic coordinates. Twenty-six molecules without determined crystallographic structure had been shaped for theoretical study. 104 variables for each compound had been calculated, and carried through the correlation study structure-catalyst activity through chemometric methods. A separation model was gotten in one single class. Finally the attempt of forecast of activity of twenty four compounds with activity unknown was carried through, getting itself as resulted the probability of twenty in all to be able to become active.

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Santos, Juliana Alves dos. "Preparação e avaliação biológica de conjugados esteroides/bases de Schiff." Universidade Federal de Juiz de Fora (UFJF), 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/7225.

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A presente tese, intitulada "Preparação e avaliação biológica de conjugados esteroides/bases de Schiff" trata, sobretudo, da preparação, caracterização e avaliação do potencial biológico de compostos orgânicos contendo uma porção esteroidal associada a uma base de Schiff nos quais a conjugação se deu nas posições C-3 ou C-24 dos núcleos esteroidais cólico, desoxicólico ou colesterol. Além destes, encontra-se descrita também a preparação de derivados destas duas classes de compostos de forma não conjugada. Os compostos aqui descritos foram preparados através da utilização de metodologias clássicas em síntese orgânica, as quais envolvem a formação de amidas, reações de esterificação e formação de iminas; todas relacionadas à química de compostos carbonílicos. As estruturas químicas dos produtos obtidos, bem como as dos intermediários sintéticos, foram devidamente confirmadas por espectroscopia no infravermelho, de ressonância magnética nuclear de próton e de carbono, por espectrometria de massas, além de faixa de fusão e análise elementar. Os compostos sintetizados foram avaliados como potenciais antiparasitários (leishmanicidas e antimaláricos), antibacterianos (antituberculosos) e antioxidantes (inibidores do radical DPPH). Tais propriedades foram selecionadas por já serem atividades descritas para as duas classes de moléculas exploradas neste trabalho- derivados esteroidais e bases de Schiff. Baseado nas estruturas dos compostos descritos neste trabalho realizou-se também testes de avaliação da atividade fotoprotetora (fatores de proteção solar UVA e UVB e determinação do comprimento de onda crítico) de alguns dos conjugados obtidos. Grande parte dos compostos sintéticos apresentaram atividade biológica promissora.
The thesis entitled ―Preparation and biological evaluation of conjugated steroids/Schiff bases‖ deals mainly with the preparation, characterization and evaluation of the biological potential of organic compounds containing a steroid portion associated with a Schiff base in which the conjugation occurred the C-3 or C-24 positions of the steroid nucleus cholic, deoxycholic or cholesterol. In addition, is also described the preparation of derivatives of these two classes of compounds in non conjugated form. The compounds described herein were prepared by using classical methods of organic synthesis, which involves amide formation, sterification and imine formation; all related to chemistry of carbonyl compounds. The chemical structures of the obtained products, as well as synthetic intermediates were confirmed by infrared spectroscopy, nuclear magnetic resonance of proton and carbon, by mass spectrometry, elemental analysis and melting point. The synthesized compounds were evaluated as potential antiparasitic (antileishmanial and antimalarial), antibacterial (antituberculosis) and antioxidants (DPPH radical inhibitors). These properties have been selected by already being activities described for the two classes of molecules explored in this work-steroidal derivatives and bases Schiff. Based on the structures of the compounds described in this work also conducted evaluation tests of sunscreen activity (sun protection factor UVA and UVB, and determining the critical wavelength) of some of the conjugates. Much of the synthetic compounds showed promising biological activity.

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Books on the topic "Bases de Schiff"

1

Minbaev, B. U. Fiziko-khimicheskie svoĭstva shiffovykh osnovaniĭ: Spravochnik. Alma-Ata: "Nauka" Kazakhskoĭ SSR, 1990.

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Minbaev, B. U. Shiffovy osnovanii͡a︡. Alma-Ata: Izd-vo "Nauka" Kazakhskoĭ SSR, 1989.

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Kubicki, Jacek. Spektralne i fotofizyczne właściwości wzbudzonych cząsteczek i krótko żyjących indywiduów przejściowych na przykładzie tioketonów i zasad Schiffa: Spectral and photophysical properties of tioketones and Schiff bases : excited molecules and transient species. Poznań: Wydawnictwo Naukowe Uniwersytetu im. Adama Mickiewicza, 2008.

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Ju xi fu jian de he cheng yu xing neng yan jiu. Ha'erbin Shi: Heilongjiang da xue chu ban she, 2011.

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Way down: Playing bass with Elvis, Dylan, the Doors & more : the autobiography of Jerry Scheff. Milwaukee, WI: Backbeat Books, 2012.

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Doctrinas y relaciones de poder en el Cisma de Occidente y en la época conciliar (1378-1449). Zaragoza: Prensas de la Universidad de Zaragoza, 2013.

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Dei, Luigi. Revealing Ravel: la scienza racconta Boléro. Florence: Firenze University Press, 2015. http://dx.doi.org/10.36253/978-88-6655-657-2.

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Raccontare la musica con la scienza. È la scommessa alla base di Revealing Ravel: la scienza racconta Bolero, pièce musicale per voce recitante, multimedia e orchestra sulle note del compositore francese. L’autore e protagonista è Luigi Dei, docente di Chimica al Dipartimento di Chimica “Ugo Schiff”. Dei si misura attraverso un approccio insolito con la composizione di Maurice Ravel, a fianco dell’Orchestra sinfonica del Conservatorio “Luigi Cherubini”, diretta dal Maestro Paolo Ponziano Ciardi: per la scienza, infatti, la musica è energia che si propaga attraverso la materia grazie a vibrazioni generate dagli strumenti che, con opportune risonanze, generano timbri, ritmo, melodia e armonia. Il Bolero, brano musicale particolarmente adatto a comprendere la meraviglia che sta dietro alla produzione dei suoni, viene letto come una favola fantastica. La pièce musicale, che consolida la collaborazione fra due importanti istituzioni culturali del territorio fiorentino, l’Ateneo e il Conservatorio, unisce alla recitazione e all’ascolto dal vivo, la comunicazione per immagini grazie a un apparato multimediale a cura del Servizio Produzione Contenuti Multimediali dell’Ateneo.

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Sleep and aging: A research-based guide to sleep in later life. Baltimore: Johns Hopkins University Press, 1987.

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Die kirchliche Krise des Spätmittelalters: Schisma, Konziliarismus und Konzilien. München: Oldenbourg, 2012.

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Konziliarismus und Polen: Personen, Politik und Programme aus Polen zur Verfassungsfrage der Kirche in der Zeit der mittelalterlichen Reformkonzilien. Paderborn: F. Schöningh, 1998.

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Book chapters on the topic "Bases de Schiff"

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Boucher, L. J., Karl Koeber, Dieter Tille, Helga Demmer, Helga Köttelwesch, and Edith Schleitzer-Rust. "Complexes with Schiff Bases." In Mn Manganese, 3–238. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-08178-5_2.

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Varvarigou, A. D., E. Chiotellis, and G. Evagelatos. "Radiolabelled Schiff Bases in Brain Studies." In Progress in radiopharmacology 1985, 131–37. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5028-3_8.

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Hadjoudis, E., I. Moustakali-Mavridis, and J. Zyss. "Nonlinear Optics in Solid Schiff Bases." In Conjugated Polymeric Materials: Opportunities in Electronics, Optoelectronics, and Molecular Electronics, 451–56. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2041-5_35.

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Holm, R. H., G. W. Everett, and A. Chakravorty. "Metal Complexes of Schiff Bases and β-Ketoamines." In Progress in Inorganic Chemistry, 83–214. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470166086.ch3.

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Sandorfy, C., and D. Vocelle. "The Problem of Protonation in Rhodopsin and Model Schiff Bases." In Topics in Molecular Organization and Engineering, 195–211. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1173-4_9.

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Parashar, R. K., R. C. Sharma, and Govind Mohan. "Synthesis and Biocidal Activity of Some Copper-Tridentate Schiff Bases." In Biology of Copper Complexes, 533–40. Totowa, NJ: Humana Press, 1987. http://dx.doi.org/10.1007/978-1-4612-4584-1_42.

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Polt, Robin, Brian Dangel, Bhaskar Tadikonda, and Brian Kelly. "Bifurcated Dipeptide Schiff Bases as Ligands for Enantioselective Catalysis: Micro-Metalloenzymes." In Peptides: The Wave of the Future, 273–74. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0464-0_124.

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Blazquez, M., J. M. Sevilla, J. Perez, M. Dominguez, and F. Garcia-Blanco. "A New Approach to the Study Of Pyridoxal-5′-Phosphate Schiff Bases." In Biochemistry of Vitamin B6, 353–58. Basel: Birkhäuser Basel, 1987. http://dx.doi.org/10.1007/978-3-0348-9308-4_62.

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Garavelli, Marco, Fernando Bernardi, Massimo Olivucci, and Michael A. Robb. "Potential Energy Surfaces for Ultrafast Photochemistry: Short Chain Polyenes and Protonated Schiff Bases." In Springer Series in Chemical Physics, 612–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72289-9_185.

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Sivaev, Igor B., Aleksandr B. Bruskin, Vladimir V. Nesterov, Mikhail Yu Antipin, Vladimir I. Bregadze, and Stefan Sjöberg. "Synthesis of Schiff Bases and Monoalkylamino Derivatives on the Base of Amino-closo-Dodecaborate(1-) Anion [B12H11NH3]-." In Frontiers in Neutron Capture Therapy, 779–83. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1285-1_113.

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Conference papers on the topic "Bases de Schiff"

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PEROBELLI, Giullia, Nayara G. S. CAVALCANTE, Ana Cristina F. de Brito PONTES, and Daniel de Lima PONTES. "Esferas de quitosana: produção de bases de schiff." In 5º Encontro Regional de Química & 4º Encontro Nacional de Química. São Paulo: Editora Edgard Blücher, 2015. http://dx.doi.org/10.5151/chenpro-5erq-in2.

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Sharma, Jyoti, Pernita Dogra, Nadeem Sharma, and Ajay. "Applications of coordination compounds having Schiff bases: A review." In ADVANCES IN BASIC SCIENCE (ICABS 2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122381.

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Abu Bakar, Ahmad Fauzi, Hadariah Bahron, Karimah Kassim, and Mazatulikhma Mat Zain. "Synthesis, characterization and neurotoxicity of schiff bases derived from 1,8-diaminonaphthalene." In 2010 International Conference on Science and Social Research (CSSR). IEEE, 2010. http://dx.doi.org/10.1109/cssr.2010.5773736.

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Ha, Sie-Tiong, Hong-Cheu Lin, Guan-Yeow Yeap, Siew-Teng Ong, and Teck-Ming Koh. "Synthesis and Mesogenic Properties of New Schiff Bases Comprising Benzothiazole Moiety." In The 13th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2009. http://dx.doi.org/10.3390/ecsoc-13-00168.

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Yass, Duaa Ayad, and Inam Hussein Khudhair. "Preparing and diagnosing some Schiff bases and evaluating their biological efficacy." In 2ND INTERNATIONAL CONFERENCE ON MATERIALS ENGINEERING & SCIENCE (IConMEAS 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000348.

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Lončar, Mirjana, and Maja Molnar. "Green synthesis of coumarinyl Schiff bases utilizing choline chloride-based deep eutectic solvents." In 6th International Electronic Conference on Medicinal Chemistry. Basel, Switzerland: MDPI, 2020. http://dx.doi.org/10.3390/ecmc2020-07405.

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Guo, Lei, Xiaolei Ren, Yang Zhou, Shenying Xu, and Yulong Gong. "Monte Carlo simulations of corrosion inhibition of copper by two Schiff bases." In 2015 International Conference on Materials, Environmental and Biological Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/mebe-15.2015.143.

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Bouchouit, K., A. Bouraiou, S. Arroudj, K. El korchi, and D. Guichaoua. "Nonlinear Optical Properties (Electronic Contribution) of a Conjugated Series of Schiff Bases Compounds." In 2019 21st International Conference on Transparent Optical Networks (ICTON). IEEE, 2019. http://dx.doi.org/10.1109/icton.2019.8840478.

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"Antimalarial, Anti-trypanosomiasis, Anti-HIV and Cytotoxicity Studies of Some Ferrocenyl Schiff bases." In Nov. 27-28, 2017 South Africa. EARES, 2017. http://dx.doi.org/10.17758/eares.eap1117039.

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Mohd Fadzel, Fatimatuzzahraa, Hadariah Bahron, Karimah Kassim, and Mazatulikhma Mat Zain. "Toxicity study of Schiff bases derived from 2,6-diaminopyridine and their novel metal complexes." In 2010 International Conference on Science and Social Research (CSSR). IEEE, 2010. http://dx.doi.org/10.1109/cssr.2010.5773885.

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Reports on the topic "Bases de Schiff"

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Zauche, Timothy. Kinetics and mechanisms of the oxidation of alcohols and hydroxylamines by hydrogen peroxide, catalyzed by methyltrioxorhenium, MTO, and the oxygen binding properties of cobalt Schiff base complexes. Office of Scientific and Technical Information (OSTI), February 1999. http://dx.doi.org/10.2172/770652.

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