Physico-Chemical Investigations on the Complexation of Heavy Metal Ions with Dithiolterephthalic Acid Part IV Amperometric Study on the Complexes of TI (I) Sm (III) and Pr (III)

Department of Chemistry, Malaviya Regional Engineering College, Jaipur

Manuscript received 2 August 1971; revised 22 August 1972; accepted 12 January 1973

The amperometric titrations carried out between Na₂-dithiolterephthalate [R(SNa)₂] and TI(I), Sm(III) and Pr(III) at E_d.e. =-0.01 V (VS S.C.E.) reveal the formation of insoluble compounds having the compositions, (I) RS₂TI₂, (II) (RS₂)₃ Sm₂ and (III) (RS₂)₃ Pr₂. The compounds of Sm (III) and Pr(III) have appreciable solubility and hence their reactions were studied in 50% aq.- ethanolic medium. Thallium (I)—dithiolterephthalate is sparingly soluble compound and its formation has also been substantiated conductometrically.