Synthesis and structural and magnetic characterisation of copper(II) complexes of mixed phosphonate-antimonate ligands

Shoaib Ali, Christopher A. Muryn, Floriana Tuna, Richard E P Winpenny

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    Abstract

    A polynucleating oxygen donor ligand based on condensation of p-chlorophenylstibonic acid (ArSbO3H2) and t-butylphosphonic acid is reported. [(SbAr)2O(HO3P tBu) 6] contains two antimony centres, bridged by an oxide and two hydrogen phosphonates. Reaction with copper acetate under solvothermal conditions produces four new polymetallic copper complexes. With pyridine used as a base the major product is a tetracopper cage, [Cu4O2 (SbAr)2(O3PtBu)2(O 2CMe)2(OMe)6], with the four copper centres arranged in a rhombus; a minor product is a tricopper complex, [Cu 3O4(SbAr)2 (O3PtBu) 4 (py)3]. With LiOMe as base the major product is again the tetranuclear cage, but the minor product is a heterometallic cage, [Cu 5Li4O6(SbAr) 4(O3P tBu)6(O2CMe)2(OMe)4 (MeOH)4]. With 2,6-lutidine as base an octametallic complex is formed, [Cu8O4(SbAr) 2(O3 P tBu)6(O2CMe)4(lutidine) 2]. Magnetic studies show both anti-ferromagnetic and weak ferromagnetic exchange between the copper centres in these new complexes. © The Royal Society of Chemistry 2010.
    Original languageEnglish
    Pages (from-to)124-131
    Number of pages7
    JournalDalton Transactions
    Volume39
    Issue number1
    DOIs
    Publication statusPublished - 2010

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