光度法单核与多核共存体系配合物组成及稳定常数的测定

Spectrophotometric Determination of Compositions and Stability Constants of Coordination Compounds in Mononuclear and Polynuclear Coexistent Systems

提出等色点摩尔比法测定单核与多核共存体系配合物的组成和稳定常数。方法用于铟-二甲酚橙体系,测得体系中存在的两配合物的组成比In/XO分別为1:1(λ_(max)=510nm)和2:1(λ_(max)=560nm),其稳定常数分别为K_1=8.83X10^8,K_2=1.44X10^7。

Isobestic point spectrophotometric method is proposed to determine the compositions and stability constants of complexes in a coexistent system of mononuclear and polynuclear complexes. This method has been used in a indium-xylenol orange system, the compositions of the two complexes obtained are 1:1 (In:XO,λmax=510 nm) and 2:1(λmax=560 nm), and the stability constants are K1 = 8. 83×108 and K2=1. 44×107, respectively.