Derivatives of the types [CCul{Sn2(OR)9}] (R = Et, 1; R = Pri, 2) and [Cu{Sn2(OR)9}2] (R = Et, 3; R = Pri, 4) have been synthesised by the reactions of anhydrous CuCl2 with NaSn2(OR)9 (R = Et, Pri) in 1: 1 and 1: 2 molar ratios in benzene, respectively. The chloro(nonaalkoxodistannato)-copper(II) complexes 1–2 yield, via chloride replacement reactions with a variety of monodentate (e.g., EtO–, PriO–) or chelating [e.g., Al(OEt)4–, Al(OPri)4–, Zr2(OPri)9–, and Nb(OPri)6–] ligands, novel heterometallic alkoxides of copper(II). All of the complexes 1–19 are highly moisture-sensitive, coloured solids, that are soluble in typical organic solvents. They are monomeric in benzene solution and are thermally unstable under reduced pressure.
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