Coordination Selectivity in Aluminum(III) Complex with 8-Hydroxy-7-[(2-hydroxy-5-carboxyphenyl)azo]-5-quinolinesulfonic Acid: Evidence for Linkage Isomerism
作者:Zhi-Ping Bai、Hisahiko Einaga、Jinsai Hidaka
DOI:10.1246/bcsj.61.1959
日期:1988.6
The coordination reaction of 8-hydroxy-7-[(2-hydroxy-5-carboxyphenyl)azo]-5-quinolinesulfonic acid (hcqs) to aluminum(III) has been investigated spectrophotometrically in a weakly acidic aqueous solution (pH 2–5) with 0.1 mol dm−3 NaCl at 22.0 °C; the thermodynamic stability, kinetics, and mechanism of the formation of the aluminum(III) complex were deduced. The ligand rapidly coordinates to aluminum(III)
8-羟基-7-[(2-羟基-5-羧基苯基)偶氮]-5-喹啉磺酸 (hcqs) 与铝 (III) 的配位反应已在弱酸性水溶液 (pH 2-5) 中进行了分光光度法研究) 使用 0.1 mol dm-3 NaCl 在 22.0 °C 下;推导出了铝(III)配合物的热力学稳定性、动力学和形成机制。配体与铝 (III) 及其 8-羟基喹啉 (O-N) 部分快速配位,形成黄色配合物(金属:配体 = 1:1),然后配合物缓慢变化,通过分子内重排,成为带有二羟基偶氮 (ONO) 部分的红色复合物,因此显示出连接异构现象。在第一次配位过程中,配合物主要通过 AlOH2+ 与 Hhcqs3- 的反应途径形成。铝(III)与相关配体的配位反应机理,