Studies on ion association: thermodynamics of formation of monoselenocyanato-complexes of cobalt(II), nickel(II), and cadmium(II)

Abstract

Free-energy and enthalpy changes of formation of monoselenocyanato-complexes of Co^II, Ni^II, and Cd^II have been determined by potentiometry and calorimetry respectively. The stabilities of the selenocyanato-complexes are slightly lower than the corresponding thiocyanato-complexes. The thermodynamic data suggest that whereas [SCN]^– ion co-ordinates with Cd²⁺ through either the N or S atom, [SeCN]^– does so exclusively through the N atom.