2-(5-溴-2-吡啶偶氮)-5-二乙氨基酚与Yb(Ⅲ)络合平衡的双系列线性回归法研究

STUDY OF COMPLEXATION EQUILIBRIUM OF THE REACTION OF 2-(5-BROMO-2-PYRIDYLAZO)-5-DIETHYLAMINOPHENOL WITH YTTERBIUM BY THE BI-SERIES LINEAR REGRESSION METHOD

用双系列线性回归法研究了Yb(Ⅲ )与 5 Br PADAP的络合反应 ,发现在 pH 9.6 6 ,30 %(体积分数 )的乙醇溶液中 ,Yb(Ⅲ )与 5 Br PADAP形成 1∶2的络合物 ,络合物的稳定常数 (lgβ)为 7.58,最大吸收波长为 580nm ,摩尔吸光系数为 2 .0 9× 10 5L·mol- 1·cm-

The bi series linear regression method was applied to study the complexation equilibium of the reaction of 2 (5 bromo 2 pyridylazo) 5 diethylaminophenol (5 Br PADAP) with Yb(Ⅲ) in an ethanol solution(3+7) at pH 9.66. Under optimum experimental conditions, Yb(Ⅲ) reacts with 5 Br PADAP to form a 1∶2 complex. The molar absorptivity of the complex is 2.09×10 5L·mol -1 ·cm -1 at 580nm. Its stability constant is lg β =7.58.