THERMODYNAMIC STUDIES ON THE COMPLEXATION OF ALKALINE-EARTH METAL-IONS WITH ORTHO-PHENYLENEDIAMINE-N,N,N',N'-TETRAACETATE IN AQUEOUS-SOLUTIONS

被引：6

作者：

NAKASUKA, N

SAWARAGI, M

MATSUMURA, K

TANAKA, M

机构：

来源：

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN | 1992年 / 65卷 / 06期

关键词：

D O I：

10.1246/bcsj.65.1722

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Potentiometric and calorimetric studies were carried out for the complexation of o-phenylenediamine-N,N,N',N'-tetraacetate (PhDTA, L4-) with alkaline-earth metal ions (M2+) in aqueous solutions at 25.0-degrees-C and 1.0 M (NaClO4). The formation constants (log K(ML)) obtained are 6.48 (Be), 6.481 (Mg), 8.27 (Ca), 5.47 (Sr), and 3.99 (Ba), respectively. The changes in enthalpy (DELTA-H-degrees(ML)/kJ mol-1) are 45.5 (Be), 34.3 (Mg), -14.0 (Ca), 2.7 (Sr), and 2.5 (Ba), respectively.

引用

页码：1722 / 1724

页数：3

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