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Issue 1, 1982
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Ternary co-ordination complexes of copper(II) with L-histidine and some selected amino-acids

Abstract

The multiple equilibria involved in some ternary systems of copper(II) containing L-histidine (A) and DL-2-aminobutyric acid, DL-3-aminobutyric acid, 4-aminobutyric acid, DL-4-amino-3-hydroxybutyric acid, DL-2,3-diaminopropionic acid, DL-2,4-diaminobutyric acid, or DL-ornithine (B) have been investigated by pH titrimetry in aqueous perchlorate media at 37 °C and l= 0.15 mol dm–3(Na[ClO4]). Ternary complex species of the type [CuAB], [CuABH], and [CuABH2] were detected. In every system studied, greater stability than would be expected statistically is observed. L-Histidine (A) binds in a tridentate manner in all the systems. Among the potentially tridentate secondary ligands (B) used, DL-2,3-diaminopropionic acid, DL-2,4-diaminobutyric acid, and DL-ornithine bind in a tridentate manner, while DL-4-amino-3-hydroxybutyric acid appears to be bidentate. The probable sites of protonation in the [CuABH] and [CuABH2] complexes are discussed in terms of their stability-constant data.

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Article information


J. Chem. Soc., Dalton Trans., 1982, 55-60
Article type
Paper

Ternary co-ordination complexes of copper(II) with L-histidine and some selected amino-acids

M. S. Nair, K. Venkatachalapathi, M. Santappa and P. K. Murugan, J. Chem. Soc., Dalton Trans., 1982, 55
DOI: 10.1039/DT9820000055

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