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Issue 9, 2004
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Unexpected formation of a copper(II) 12-metallacrown-4 with (S)-glutamic-γ-hydroxamic acid: a thermodynamic and spectroscopic study in aqueous solution

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Abstract

The equilibria of copper(II) with (S)-glutamic-γ-hydroxamic acid (H2L) were investigated in aqueous solution by different techniques: glass electrode potentiometry; calorimetry; VIS and CD spectrophotometry; and ES-MS. An unexpected pentacopper(II) 12-metallacrown-4 [Cu5L4H−4]2− was detected, analogous to those well known formed by α- and β-aminohydroxamic acids, but of lower stability. Another five species were found: [CuLH]+; [CuL2H2]; [Cu2L2]; [CuL2H]; and [CuL2]2−. Their structures are proposed based on both spectroscopic and calorimetric data.

Graphical abstract: Unexpected formation of a copper(ii) 12-metallacrown-4 with (S)-glutamic-γ-hydroxamic acid: a thermodynamic and spectroscopic study in aqueous solution

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Publication details

The article was received on 19 Dec 2003, accepted on 04 Mar 2004 and first published on 24 Mar 2004


Article type: Paper
DOI: 10.1039/B316607D
Citation: Dalton Trans., 2004,0, 1329-1333
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    Unexpected formation of a copper(II) 12-metallacrown-4 with (S)-glutamic-γ-hydroxamic acid: a thermodynamic and spectroscopic study in aqueous solution

    M. Tegoni, F. Dallavalle, B. Belosi and M. Remelli, Dalton Trans., 2004, 0, 1329
    DOI: 10.1039/B316607D

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