Metal chelates of Triazine-Schiff-bases: Complex formation of 3-(?-phenyl)ethylidenehydrazino-5,6-diphenyl-1,2,4-triazine with copper(II)
摘要:
Complex formation of copper(II)-ions with 3-(alpha-Phenyl)ethylidenehydrazino-5,6-diphenyl-1,2,4-triazine (BHT) has been investigated using UV-VIS-,IR-, and electrochemical methods. Optimal pH for the 1:1 complex formation (and therefore for analytical applications) was found at 5.4. This complex could be isolated. The acid dissociation constant of the free ligand is pK(a) = 13.60; formation constants for 1:1 and 1:2 complexes were found to be log K1 = 12.0 and log K2 = 10.4, respectively. Polarographic reduction of both the free ligand and the Cu(II)-complexes is irreversible, diffusion controlled and like the stability of the complex pH-dependent.
Misra; Sen; Sen Gupta, Journal of the Indian Chemical Society, 1989, vol. 66, # 5, p. 322 - 324
作者:Misra、Sen、Sen Gupta
DOI:——
日期:——
Metal chelates of Triazine-Schiff-bases: Complex formation of 3-(?-phenyl)ethylidenehydrazino-5,6-diphenyl-1,2,4-triazine with copper(II)
作者:A. Taha、S. El-Shetary、W. Linert
DOI:10.1007/bf00808671
日期:1993.2
Complex formation of copper(II)-ions with 3-(alpha-Phenyl)ethylidenehydrazino-5,6-diphenyl-1,2,4-triazine (BHT) has been investigated using UV-VIS-,IR-, and electrochemical methods. Optimal pH for the 1:1 complex formation (and therefore for analytical applications) was found at 5.4. This complex could be isolated. The acid dissociation constant of the free ligand is pK(a) = 13.60; formation constants for 1:1 and 1:2 complexes were found to be log K1 = 12.0 and log K2 = 10.4, respectively. Polarographic reduction of both the free ligand and the Cu(II)-complexes is irreversible, diffusion controlled and like the stability of the complex pH-dependent.