Synthesis, Characterization and Solvent Effects on the Electronic Absorption Spectra of Aminopyridine Schiff Bases
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Date
2013-11
Authors
Dueke-Eze, C.U.
Fasina, T.M.
Mphahlele, M.J.
Journal Title
Journal ISSN
Volume Title
Publisher
Asian Journal of Chemistry
Abstract
Six Schiff bases, namely, N-(2-hydroxylbenzylidene)pyridine-4-amine (IA), N-(2-hydroxylbenzylidene)pyridine-2-amine (IB), N-(5-
nitro-2-hydroxylbenzylidene)pyridin-4-amine (IIA), N-(5-nitro-2-hydroxylbenzylidene)pyridin-2-amine (IIB), N-(5-bromo-2-
hydroxylbenzylidene)pyridin-4-amine (IIIA) and N-(5-bromo-2-hydroxylbenzylidene)pyridin-2-amine (IIIB) derived from condensation
reactions of 4-aminopyridine or 2-aminopyridine with salicylaldehye, 5-nitrosalicylaldehye and 5-bromosalicylaldehye were synthesized
and characterized using elemental analysis, IR, NMR and Raman spectroscopic techniques. The effect of solvent on the electronic
absorption spectra was examined in five solvents of different polarities, namely, 1,4-dioxane, chloroform, ethanol, acetonitrile and N,Ndimethyl formamide. The bands involving different electronic transitions were interpreted and regression coefficients calculated for the
absorption band involving intermolecular charge transfer transition within the whole Schiff base molecule using an equation that relates
the absorption maxima to empirical solvent parameters that depend on the dielectric constant, refractive index and hydrogen bonding
ability of the solvents.
Description
Keywords
Schiff bases , 2-Aminopyridine , 4-Aminopyridine , Solvent effect , Electronic spectra
Citation
Dueke-Eze, Cordelia & Fasina, Tolu & Mphahlele, Malose J. (2013). Synthesis, Characterization and Solvent Effects on the Electronic Absorption Spectra of Aminopyridine Schiff Bases. Asian Journal of Chemistry. 25. 8505-8508. 10.14233/ajchem.2013.14805.