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标题簇合物系通过液相氧化低价钼(MoCl_3)制得。晶体属正交晶系,空间群为D_(2h)~(16)-Pmnb,晶胞参数:a=11.403(1),b=12.345(2),c=14.292(2)(?),V=2011.8(8)(?)~3。Z=4,D_c=2.396g·cm~(-3)。使用四圆衍射仪收集衍射数据,晶体结构用重原子法解出,经全矩阵最小二乘修正,R=0.050,R_w=0.056。簇阴离子结构属M1型三核钼簇构型,Mo—Mo键2.577■;Mo—O-μ_3键1.982■。还讨论了桥原子、键级以及配体对Mo—Mo键的影响。
The title cluster compounds are prepared by liquid phase oxidation of molybdenum (MoCl 3). The crystal belongs to the orthorhombic system with space group D 2h ~ (16) -Pmnb. The unit cell parameters are a = 11.403 (1), b = 12.345 (2) and c = 14.292 (2) = 2011.8 (8) (?) ~ 3. Z = 4, D_c = 2.396g · cm -3. Diffraction data were collected using a four-circular diffractometer. The crystal structure was solved by heavy atom method and corrected by least-squares of the whole matrix with R = 0.050 and R_w = 0.056. The cluster anion structure belongs to M1-type trinuclear molybdenum cluster, Mo-Mo bond 2.577 ■ Mo-O-μ3 bond 1.982 ■. The effects of bridging atoms, bonding sites and ligands on the Mo-Mo bond were also discussed.