5 Å3. The structures were refined to conventional R values of R = 0.040 from 1630 reflections for 1 and R = 0.033 from 976 reflections for 2. In both cases, the coordination geometry about the five-coordinate cobalt atom is approximately trigonal bipyramidal, with the NO group sharing the equatorial positions with the halide ligands. Structure 2 is disordered, which prevents any precise structural characterization
CoX 2(NO)(PMe 3)2配合物(X = Cl,Br,I,NO 2)表现出明显不同的ν(NO)拉伸频率和不同的几何形状。ω1的结构2(NO)(PME 3)2(1)和
氯化钴2(NO)(PME 3)2(2)已通过X射线衍射来确定。两者均在正交晶体系统中结晶,Pnma空间群在以下尺寸的单元中具有四个分子:对于1,a = 10.497(2),b = 10.694(2),Ç = 13.975(2)埃,ν = 1568.8,A 3 ; 为2,一个= 9.607(2),b = 10.689(2),C ^ = 13.512(3)埃,ν = 1387.5埃3。的结构进行了改进,以常规- [R的值[R = 0.040从1630反射为1和- [R = 0.033从976反射为2。在这两种情况下,关于五配位
钴原子的配位几何形状均近似为三角双锥体,其中NO基团与卤化物
配体共享赤道位置。结构2是无序的,这妨碍