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Issue 1, 2006
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Coordination chemistry of 1,4-bis-carboxymethylcyclam, H2(1,4-bcc)

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Zinc metal reduction of the cobalt(III) complex [Co(1,4-bcc)]+ (1,4-bcc = 1,4-bis-carboxymethylcyclam) produces the corresponding cobalt(II) complex which crystallises as the coordination polymer {[Co(1,4-bcc)]ZnCl2}n. A method has been developed for removal of the cobalt(III) ion from [Co(1,4-bcc)]+ and isolation of the free ligand as its hydrochloride salt, H2(1,4-bcc)·4HCl. This has been used for the preparation of new metal complexes, and the syntheses and characterisation of the copper(II), nickel(II), zinc(II) and chromium(III) complexes containing the 1,4-bcc ligand are described. X-Ray crystal structures of {[Co(1,4-bcc)]ZnCl2}n·2.5H2O, {[Cu(1,4-bcc)]CuCl2}n·0.25MeOH·H2O and [Cu(1,4-bcc)H]ClO4 show the complexes to have the trans(O) geometry of the 1,4-bcc ligand, while the structure of [Cr(1,4-bcc)H0.5](ClO4)1.5·EtOH exhibits the cis(O) configuration.

Graphical abstract: Coordination chemistry of 1,4-bis-carboxymethylcyclam, H2(1,4-bcc)

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The article was received on 09 Sep 2005, accepted on 24 Oct 2005 and first published on 14 Nov 2005

Article type: Paper
DOI: 10.1039/B512798J
Citation: Dalton Trans., 2006,0, 152-158
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    Coordination chemistry of 1,4-bis-carboxymethylcyclam, H2(1,4-bcc)

    D. M. Tonei, D. C. Ware, P. J. Brothers, P. G. Plieger and G. R. Clark, Dalton Trans., 2006, 0, 152
    DOI: 10.1039/B512798J

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