Oxygen Abstraction Reactions of N-Substituted Hydroxamic Acids with Molybdenum(V) and Vanadium(III) and -(IV) Compounds
作者:David A. Brown、H. Bögge、R. Coogan、D. Doocey、T. J. Kemp、A. Müller、B. Neumann
DOI:10.1021/ic950819r
日期:1996.1.1
account for the tendency to form clusters in FABMS. In constrast, the electrospray MS of the vanadyl dihydroxamates, VO(OH)[PhN(O)C(O)(CH(2))(n)()C(O)N(O)Ph] (n = 3, 5) and VO(OH)[p-CH(3)C(6)H(4)N(O)C(O) (CH(2))(n)()C(O)N(O)C(6)H(4)-CH(3)) (n = 2, 4) show the presence of dimers in solution.
各种各样的N-取代的一羟基和二羟基肟酸在与V(III),V(IV)和Mo(V)化合物反应时会发生吸氧反应,分别与V(V)和Mo(VI)形成异羟肟酸酯相应的酰胺和二酰胺。在FABMS条件下,钼烯基和钒氧肟酸酯形成金属-氧簇。[MoO(2)CH(3)(CH(2))(n)()C(O)N(C(6)H(5))O}(2)的X射线晶体结构(1和2)(n = 4,5)显示具有结构反式作用的单体结构,从而削弱了Mo-O(配体)键,这可能解释了FABMS中形成簇的趋势。相比之下,钒酸二氢氧肟酸酯VO(OH)[PhN(O)C(O)(CH(2))(n)()C(O)N(O)Ph]的电喷雾MS(n = 3 5)和VO(OH)[p-CH(3)C(6)H(4)N(O)C(O)(CH(2))(n)()C(O)N(O)C (6)H(4)-CH(3))(n = 2,4)显示溶液中存在二聚体。