The complexing of indium(III) by cysteine: evidence for sulfurbridged and protonated complexes.
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概要
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The complex formation of the cysteine–In(III) system has been investigated by potentiometric titration and by PMR, IR, and UV spectroscopic measurements. The InL, InL<SUB>2</SUB> and InLH species are predominantly formed at the metal concentrations from 0.00025 to 0.0005 M. At higher concentrations of the metal ion (0.0025–0.005 M), however, the InL species is negligible and the InL<SUB>2</SUB>, InL<SUB>3</SUB>, InL(LH), and In(LH)<SUB>2</SUB> species are predominant. The formation constants calculated with a non-linear, least-squares program were logβ<SUB>110</SUB>=14.12, logβ<SUB>120</SUB>=27.26, logβ<SUB>130</SUB>=32.20, logβ<SUB>11−1</SUB>=18.46, logβ<SUB>12−1</SUB>=31.78, and logβ<SUB>12−2</SUB>=35.74 for InL, InL<SUB>2</SUB> InL<SUB>3</SUB>, InLH, InL(LH), and In(LH)<SUB>2</SUB> respectively. The IR and UV spectra revealed that the amino group of the coordinating cysteine was protonated. The [In<SUB>3</SUB>L<SUB>4</SUB>(OH)(H<SUB>2</SUB>O)] complex was isolated.
- 公益社団法人 日本化学会の論文
著者
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Sugiura Yukio
Faculty Of Pharmaceutical Science Kyoto University
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Tanaka Hisashi
Faculty Of Engineering University Of Miyazaki
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Kojima Nakao
Faculty of Pharmaceutical Sciences, Kyoto University
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