Formation of Nitrite Complexes of Gallium(III) and Indium(III) in Aqueous Solution

Abstract

Abstract Stepwise complex formation between gallium(III), indium(III) and nitrite ions has been studied potentio-metrically by means of a glass electrode in an aqueous sodium perchlorate medium of unit ionic strength at 25.0°C. In both systems only mononuclear complexes of moderate stability were formed over the range of concentrations used. No evidence has been found for the formation of polynuclear and/or acid complexes. Values of the overall constants for the formation of Ga(NO2)2+ In(NO2)2 +, In(NO2)2 and In(NO2)3 are 130 ± 40M−1, 390 ± 110M−1, (1.04 ± 0.29)104 M−2, and (8 ± 5)104 M−3, respectively.