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Heteronuclear alcoholate complexes [M{Al(OiPr) 4 } 2 (bipy)] (2-M, M = Fe, Co, Ni, Cu, Zn) and [M{Al(OcHex) 4 } 2 (bipy)] (3-M, M = Fe, Co, Ni, Zn) are formed by adduct formation of [M{Al(OiPr) 4 } 2 ] (1-M, M = Fe, Co, Ni, Cu, Zn) with 2,2Ј-bipyridine and transesterification reaction with cHexOAc. According to crystal structure analyses, in 2-M and 3-M the central transition metal ion M 2+ is coordinated by two chelating Al(OR) 4 moieties and one bipyr