镧与偶氮氯膦MK配位反应的光谱性质研究

Investigation of Spectral Properties for Lanthanum-Chlorophosphonazo MK Complex Solution

在 p H1.89溶液中 ,镧 ( )与偶氮氯膦 MK(CPAMK)发生配位反应 ,本文应用光谱修正理论研究配合物溶液性质参数如络合物组成比、逐级摩尔吸收系数、稳定常数等的测定。结果表明 :所生成配合物为 L a(CPAMK) 6 ,在 6 6 8nm波长处真实摩尔吸收系数ε=1.13× 10 5lmol- 1 cm- 1 ,其累积稳定常数 K=3.6 6× 10 37。

The reaction between lanthanum (Ⅲ) and chlorophosphonazo MK (CPAMK) was sensiti ve at pH 1.89 . The spectra correction principle was used to investigate the properties of La-CPAMK complex, which involved the complexation ratio, stepwise absorptivity and stability constant. Results showed that the formed complex was expressed as: La (CPAMK) 6, its real (not apparent) absorptivity being 1.13×1 0 5lmol -1 cm -1 at 668nm and its cumulative stability constant b eing 3.66×10 37 .