Formation of Binary, Binucleating and Mixed Metal Complexes of Catechol Violet

Department of Chemistry, Hindu College, Moradahad-244 001 Manuscript received 16 June 1995, revised 15 February 1996, accepted 8 March 1996 pH-metric studies on interaction of Nan, Cull, Znll, PdII, AgI and Cdll with 3, 4', 4' -trihydroxyfuchsome-2''-sulphonic acid (catecholviolet, CAV) have been carried out in aqueous solution at 25' and an ionic strength of 0.1 M KNO3. Studies reveal the formation of the species MH2A, MHA, MA (M = NiII, Cull, ZnII, Pdll, AgI and CO); PdA(OH)3-; M(H2A)2, M(H2AXHA),M(HA), (M = NiII, CuII,ZiII, Cdll); M(HAXA) (M =ZnII, Cdll); M2A (M = NiII, CuII, Znll, Pdll, CdII); M,A(OH) (M = Cun, Znll, Pdll, CdII); A(OH)2 (M = Zn Cdll); CuNiA,CuZnA; PdNiA, PdCuA, PdZnA, CuNiA(OH), CuZnA(OH), PdZnA(OH), CuNiA(OH) 2, CuZnA(OH)2 in the corresponding metal-ligand mixtures for which equilibrium constants have been evaluated