Tetraaquacopper( 11) diaquabis(malonato)cuprate( 11) has been synthesised and its structure determined by X-ray crystallography. Variable-temperature magnetic susceptibility measurements, as well as EPR and UV/VlS spectroscopic studies have also been carried out. The results show that in the solid state the compound exists as a binuclear entity, while in aqueous solution it appears to be mononuclear. This study sets at rest earlier conjectures about the structure of this interesting compound which is also found to exhibit antileukaemic activities in vivo.

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