Electroanalytical tools to investigate the divalent state of Eu£¨¢ó£© and Nd£¨¢ó£© ions in non-aqueous medium

Jignasu P Mehta£¬Himanshu M Pandya£¬Kahan I Pandya

Department of Chemistry, DST-FIST sponsored Department, Mahatma Gandhi Campus, Bhavnagar University

Õª Òª£ºThe divalent state of Ln£¨¢ó£© ions has attracted much interest because of their ability to serve isomorphously in many biological sys-tem of divalent Ca£¨II£© ion. Therefore, present paper deals with the study of divalent state of Eu£¨¢ó£© and Nd£¨¢ó£© ions in non-aqueous medium. In present study, cyclic voltammetry and chronopotentiometry were utilized to establish the divalent state of Eu£¨¢ó£© and Nd£¨¢ó£© ions. The cy-clic voltammetric technique showed two-step reduction process at cathode for both Ln£¨¢ó£© ions under specified experimental conditions and chronopotentiometric method also showed two different transition times £¨øÙ£©. Looking to the shape of cyclic voltammogram we calculated het-erogeneous forward rate constant £¨K0fh, cm/s£© and diffusion coefficient £¨D, cm2/s£© for both ions, which suggested that sweep rate had great ef-fect on the shape of cyclic voltammogram of Eu£¨¢ó£© and Nd£¨¢ó£© ions. The result of chronopotentiometry also suggested that stable divalent states of Eu£¨¢ó£© and Nd£¨III£© ions existed with chronopotentiogram with two distinct transition times. The diffusion coefficients £¨D, cm2/s£© were calculated from Sand equation. The diffusion coefficients of both techniques were compared and the results suggested that the system at electrode surface was changing from being reversible to irreversible.

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