期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 71, 期 4, 页码 1274-1280出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2008.03.029
关键词
Schiff bases; o-Vanillin; Aminopyridine; Spectrophotometry; Spectrofluorimetry; Tautomeric constants; Protonation constants; Copper(II) complexes
类别
资金
- Ministry of Science, Education Sports of the Republic of Croatia [119-1191342-2960, 119-1191342-1083]
Electronic absorption and emission properties of a series of Schiff bases derived from 2-hydroxy-3-methoxybenzaldehyde and 2-aminopyridine, 2,3-diaminopyridine, 2,6-diaminopyridine, or 3-aminomethylpyridine were studied in solvents of different polarities. The interconversion of the enolimine to the ketoamine tautomeric form was observed for compound 1, 6-methoxy-2-(3pyridylmethyliminomethyl)phenol, and the corresponding equilibrium constant was estimated in several solvents. Protonation constants of all the investigated compounds were determined spectrophotometrically in the methanol/water 1/4 system. The effect of copper(II) ions on absorption and on the emission spectra of these ligands was examined in the buffered dioxane/water 1/1 system (pH 5.8). Strong complexation of Cu(II) and formation of a 1:1 complex were observed for the bis-Schiff base derived from 2,3-diaminopyridine. The complex of copper(II) with compound I was isolated and characterized by elemental analysis, magnetic Susceptibility measurement, UV-vis and IR spectrometry. (C) 2008 Elsevier B.V. All rights reserved.
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