metal-to-ligand charge transfer transition, probably a δ → π * transition. It was also found that the compounds Mo 2 X 4 (diimine) 2 react slowly with oxygen to form Mo 2 O 4 Cl 4 (diimine) 2 and then MoO 2 Cl 2 (diimine). The crystal and molecular structure of MoO 2 Cl 2 (4,4′-dimethyl-2,2′bipyridine), determined by a three-dimensional X-ray diffraction study, is reported.
摘要络合物Mo 2 X 4(diimine)2(X = Cl,Br,I和diimine =
2,2'-联吡啶,
4,4'-二甲基-2,2'-联吡啶,
2,2'-联吡嗪,通过Mo 2(OAc)4与(CH 3)3的反应制备了
3,3'-联吡啶,2,2'-联
嘧啶,1,10-
菲咯啉和4,7
-二苯基-1,10-
菲咯啉) SiX在过量的二
亚胺存在下。产物配合物显然含有非桥连的四
钼键。每个
钼配位成二齿二
亚胺和两个卤素原子。电子吸收和电
化学研究表明,δ→δ*能带的能量转移受该跃迁与
金属到
配体电荷转移跃迁(可能是δ→π*跃迁)混合的影响。还发现化合物Mo 2 X 4(二
亚胺)2与氧缓慢反应,形成Mo 2 O 4 Cl 4(二
亚胺)2,然后形成MoO 2 Cl 2(二
亚胺)。报道了通过三维X射线衍射研究确定的MoO 2 Cl 2(4,4'-二甲基-2,2'联
吡啶)的晶体和分子结构。