Interaction of Co(acac)_2 and Ta(OMe)_5: isolation and single crystal study of hte products. M~(II)_2M~V_2(acac)_2(OMe)_(12), M~(II) = Co, Ni, Zn, or Mg and M~V = Ta or Nb: A new class of heterometallic heteroleptic alkoxide complexes

摘要

The interaction of Co(acac)_2 and Ta(Ome)_5 in dry toluene led to formation of crystalline [Co_2Ta_2(acac)_2(OMe)_(12)] 1 and [Ta(acac)(Ome_4)] 2 complexes. If the starting material is not completely water-free the products obtained are [Co_4(acac)_6(OMe)_2(MeOH)_2] 3 and Co(acac)_2(centre dot)2MeOH 4 due to hydrolysis of Ta(Ome)_5 producing free methanol and thus altering the reaction pathway. The interaction of M~(II)(acac)_2, M~(II) = Co, Ni, Zn or Mg, and M~V (Ome)_5, M~V = Ta or Nb, in dry toluene was found generally to provide M~(II)_2M~V_2(acac)_2(Ome)_(12) 5-8, a new class of heterometallic hereoleptic alkoxide complexes. The crystal structures of 1-8 have been determined.