pH Metric Study of Complexes of Some Metal Ions with 2-Hydroxy-1-Naphthaldehyde-4-Phenyl-3-Thiosemicarbazone

Department of Chemistry, Saurashtra University, Bhavnagar

Manuscript received 7 April 1975; revised 24 July 9175; accept.ed 24 July 1975

Complexes of 4-phenyl-3-thiosemicarbazones of Naphthaldehyde with Cu²⁺, Ni²⁺, Co²⁺ and VO²⁺ have been studied pH metrically. The proton ligand stability constant is 1.413 x 10¹⁰, Stability constants of metal complexes are determined by half integral, Olerup and Least square methods in 70% dioxane water media. All the metals form 1 : 2 complexes, The order of stability constant is VO²⁺ > Cu²⁺ \(\simeq\) Co²⁺ > Ni²⁺.