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Dalton Transactions

The international journal for inorganic, organometallic and bioinorganic chemistry



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Dalton Trans., 2010, 39, 124 - 131, DOI: 10.1039/b913467k

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

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

A polynucleating oxygen donor ligand based on condensation of p-chlorophenylstibonic acid (ArSbO3H2) and t-butylphosphonic acid is reported. [(SbAr)2O(HO3PtBu)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(O2CMe)2(OMe)6], with the four copper centres arranged in a rhombus; a minor product is a tricopper complex, [Cu3O4(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, [Cu5Li4O6(SbAr)4(O3PtBu)6(O2CMe)2(OMe)4 (MeOH)4]. With 2,6-lutidine as base an octametallic complex is formed, [Cu8O4(SbAr)2(O3PtBu)6(O2CMe)4(lutidine)2]. Magnetic studies show both anti-ferromagnetic and weak ferromagnetic exchange between the copper centres in these new complexes.

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