N-亚水杨基氨基酸锌配合物的合成及表征

Synthesis and Characterization of N-Salicylideneamino Acid Zinc(Ⅱ) Complexes

合成了5种氨基酸Schiff碱锌配合物Zn[(Sal-Gly)·H_2O]、Zn[(Sal-DL-Val)·H_2O]、Zn[(Sal-L-Ile)·H_2O]、Zn[(Sal-L-Leu)·H_2O]和Zn[(Sal-L-Phe)·H_2O],对配合物进行了元素分析、热重-差热分析,测定了其红外光谱、电子光谱、荧光光谱和摩尔电导,并讨论了锌配合物的结构。

Five complexes of N-salicylideneamino acid zinc ( Ⅱ ) were synthesized. The structure of the complexes were characterized by elementary analysis, thermogravimetric and differential thermal analysis, molar conductance, infrared, electronic and fluorescence spectra.The five complexes have the composition of Zn[(Sal-Gly) · H2O], Zn[(Sal-DL-Val) · H2O], Zn[(Sal-L-IIe) · H2O], Zn[(Sal-L-Leu) · H2O] and Zn[(Sal-L-Phe) · H2O] respectively. The results of the studies indicate that the tautomeric equilibrium between the ' enol-imine' and 'keto-enam-ine' exists in the Schiff bases derived from salicylaldehyde with amino acids. The structures of zinc ( Ⅱ ) complexes must be those indicated by formula Ⅲ and Ⅳ .The molar conductance data show that they are nonelectrolyte, and the TG-DTA results show that the decomposition temperature of complexes is above 300℃ and the thermal stability of them is higher than that of the ligand.Fluorescence intensity of zinc( Ⅱ ) complexes in alcohol is 43-227 times as high as that of the Schiff bases at excitation wavelength (λex = 36 8 nm) and emission wavelength (λem = 444 nm) of the complexes. N-salicylideneamino acids can be used in fluorescence analysis.