摘要:
                                Reaction of acetone oxime with [NBu(n)4]4[alpha-Mo8O26] in refluxing methanol yielded [NBu(n)4]2[Mo4O12(Me2CNO)2] 1 while that with [MoO2(acac)2] (acac = acetylacetonate) at room temperature resulted in the formation of [Mo4O10(OMe)4(Me2CNHO)2] 2. The crystal structures of 1 and 2 have been determined [1, space group P1BAR, a = 9.009(1), b = 17.860(1), c = 16.769(1) angstrom, alpha = 91.624(5), beta = 101.1 58(7), gamma = 91.983(7)-degrees, R = 0.037 for 7429 reflections with I > 3sigma(I); 2, space group P2(1)/c, a = 9.437(1), b = 8.827(1), c = 13.727(3) angstrom, beta = 92.15(1)-degrees, R = 0.029 for 2821 reflections with I > 3sigma(I)]. The anion of 1 displays a cyclic (MoO2)4(mu-O)4 ring while 2 displays a Mo(VI)4(mu3-OMe)2 central core. The mu4-kappa2N:kappa2O co-ordination mode exhibited by the acetone oximate in 1 is unprecedented for such a ligand, so is the end-on co-ordination mode of zwitterionic acetone oxime in 2. The reactivity of 1 and 2 respectively towards hydrochloric acid and tetrabutylammonium hydroxide was studied.