Electrochemical Study of Cu2+, Ni2+, Co2+ and Mn2+ Complexes with Dithiodipropionic Acid

Department of Chemistry, Malaviya Regional Engineering College, Jaipur-302 017 Manuscript received 25 July1983, revised 12 December 1983, accepted 11 February 1984 The interaction of metalion (CU2+, Ni2+ , Co2+ and Mn2+) with dithiodipropionic acid bas been investigated by potentiometric and conductometric titration techniques. Two chelates having 1 : 1 and 1 : 2 mono-ratios of metal to ligand are formed simultaneously over the pH range 3.3-5.3. Their stability constants have been determined by applying Calvin and Melchior's extension of Bjerrum's method and refined by alternative methods viz., least square treatment, correction term and convergence formulae. The values of overall \(\bigtriangleup\)G, \(\bigtriangleup\)H and \(\bigtriangleup\)S accompanying tbe complexation reactions are also evaluated at 30