Crystal and molecular structures of tetracarbonyl(3,3′-dimethyl-2,2′-bipyridine)-chromium(0) and -molybdenum(0) benzene solvates and the unsolvated tungsten(0) analogue
作者:Paul N.W. Baxter、Joseph A. Connor、John D. Wallis、David C. Povey、Anne K. Powell
DOI:10.1016/s0277-5387(00)83237-4
日期:1992.1
The crystalstructures of the complexes of 3,3-dimethyl- 2,2′-bipyridine (L), cis-[W(CO)4L], cis-[MO(CO)4L] · C4H6 and cis-[Cr(CO)4L] · C6H6 have been determined by X-ray diffraction. These structures show that repulsion between the methyl groups is principally responsible for the geometric distortion in each complex. Within the ligand, L, the two pyridine rings suffer distortion, in opposite directions
3,3-二甲基-2,2'-联吡啶(L),顺式-[W(CO)4 L],顺式-[MO(CO)4 L]·C 4 H 6和顺式-[Cr(CO)4 L]·C 6 H 6已经通过X射线衍射确定。这些结构表明,甲基之间的排斥主要是每个复合物中的几何变形的原因。在配体L中,两个吡啶环在相反的方向上发生扭曲,形成假船构象,从而优化了金属与氮的结合。苯溶剂分子以与金属络合物的单元交替的层结构排列。在每种情况下,金属络合物分子都不会与苯溶剂分子发生范德华接触。