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trans—(η~5—C_5Me_5)_2Mo_2(μ_2—S)_2(t—O)_2[Ⅰ]和cis—(η~5—C_5Me_5)Mo_2(μ_2—O)_2(t—O)_2(Ⅱ]是由Mo(CO)_6和C_5(CH_3)_5H的反应产物(η~5—C_5Me_5)_2Mo_2(CO)_4与(CH_2)_3S反应中同时得到的。晶体[Ⅰ]属四方晶系,空间群为P4_2/n,单胞参数;a=b=16.317,c=8.463,V=2253.16,Z=4。晶体[Ⅱ]亦属四方晶系,空间群为P42_1c,单胞参数:a=b=12.101,c=15.425,V=2258.54,Z=4 [Ⅰ]和[Ⅱ]分子分别具有C_1—T和C_2—2对称性。如把C_5Me_5-看成具有理想的园柱体对称性,则它们分别具有C_(2h)—2/m和C_(2v)—mm2对称性。在[Ⅰ]中Mo_2(μ_2—S)_2为菱形平面结构,而[Ⅱ]中则畸变成“蝶式”结构。由两个钼原子之间的距离(2.902和2.808)可以看出钼一钼间作用属于单键的范围内。所以它们是具有金属单键的双钼金属簇的两个立体异构体。
The effects of trans- (η ~ 5-C_5Me_5) _2Mo_2 (μ_2-S) _2 (t-O) _2 [Ⅰ] and cis- (η ~ 5-C_5Me_5) Mo_2 (μ_2-O) _2 ] Is obtained simultaneously from the reaction of (η ~ 5-C_5Me_5) _2Mo_2 (CO) _4 and (CH_2) _3S with Mo (CO) _6 and C_5 (CH_3) _5H.The crystal [Ⅰ] belongs to the tetragonal system, A = b = 16.317, c = 8.463, V = 2253.16, Z = 4. The crystal [Ⅱ] also belongs to the tetragonal system, the space group is P42_1c, the unit cell parameters are: a = b = 12.101, c = 15.425, V = 2258.54, Z = 4 [Ⅰ] and [Ⅱ] have C_1-T and C_2-2 symmetries, respectively.If C_5Me_5- is considered as an ideal cylinder symmetry, They have the symmetry C_ (2h) -2 / m and C_ (2v) -mm2 respectively. In [Ⅰ] Mo_2 (μ_2-S) _2 is a rhombic plane structure, Structure. It can be seen from the distance between the two molybdenum atoms (2.902 and 2.808) that the interaction between molybdenum and molybdenum is within the range of single bonds. So they are two stereoisomers of double molybdenum metal clusters with metal single bonds .