Synthetic approaches to mixed-metal heteroleptic derivatives of late transition metals

The approach based on isomorphous substitution permitted preparation of (Co, Ni)(4)(acac)(4)(mu (3)-OMe)(4) (MeOH)(4)(I) via interaction of individual M-4(acac)(4)(mu (3)-OMe)(4)(MeOH)(4) in toluene/methanol media. The oxidation of I in air in solution in MeOH in the presence of NaOAc and aminoalcohols as catalysts gives Co2Ni2-(acac)(4)(mu (3)-OMe)(4)(OAc)(2)(II). The symmetrization reaction between a complex formed by a hard Pearson acid and a soft Pearson base and that formed by a soft acid and a hard base led to CuNi2(OCOC2H5)(3)(ORN)(3)-((ROH)-O-N)(III) and Ni(Ni0.25Cu0.75)(2)(mu (3)-OH)(mu (2)-OAc)(OAc)(2)(mu (2), eta (2)-ORN)(3)(eta (2)-(ROH)-O-N)(IV) R-N = CH(CH3)-CH2NMe2 via interaction of Ni(ORN)(2) with copper propionate and copper acetate hydrate respectively in hydrocarbon media.