SPECTROPHOTOMETRIC METHOD FOR STUDYING THE COMPLEX FORMATION OF COPPER (II) WITH BIS [3- (CHLOROPHENYLAZOPENTADIENE-2,4) ETHYLENEDIIMINE] IN THE PRESENCE OF ANTIPYRINE AND 4-AMINOANTYPYRINE

The complex formation of copper (II) with bis [3- (chlorophenylazo-pentadiene-2,4) ethylenediimine] in the presence of antipyrine and 4-aminoantipyrine was studied by spectrophotometric method. It was found that in binary compounds (Cu (II) -R) the yield of the complex is maximum at pH = 4, the optimal wavelength is 437 nm. In the presence of antipyrine (Ant) and 4-aminoantipyrine (4-Ant), three-component compounds Cu-R-Ant and Cu-R-4-Ant are formed. In these complexes, the optimal conditions for complex formation are pHopt = 3.2, λopt = 444 nm; pHopt = 3.08; λmax = 447 nm. The ratio of the reacting components in the binary complex is 1: 1, in the mixed-ligand 1: 1: 1. The influence of foreign ions and masking substances on the determination of Cu (II) has been studied. Keywords: Copper(II), spectrophotometric method, bis-[3- (chlorophenylazo-pentadiene-2,4) ethylenediimine, antipyrine, 4-aminoantipyrine.