Research on in part "loosely" coordinated trinuclear molybdenum cluster compounds—— the synthesis and crystal structure of {Mo3（μ3-S）(μ-S)3[S2P（OEt）2]4·P（C6H5）3} （0.86CH2Cl2）

The synthesis and crystal structure of novel trinuclear molybdenum cluster compoundwith somewha "loose" coordination site {Mo（μ-S）(μ-S)[SP（OEt）]· P（CH）}’·（0.86 CHCl）have been reported. The cluster crystallizes in the spece group Pl with two molecules in a unit cellwhose parameters are a=10.472（4）, b=14.375（2）, c=21.695（3）; a=74.O4（1）°, β=76.50（2）°, γ=72.22（2）°, v=2950 and D=1.693 g.cm. On the basis of 4840 independent reflections with I≥2σ（1）.the structure was solved by heavy atom method and Fourier method and refined by full-matrixleast-squares techniques to a final R=0.058. The distances between Mo atoms in this cluster are 2.731（1）, 2.748（1） and 2.753（1） respetively.The mean value of Mo--Mo bond lengths is slighly shorter than those in other trinuclear Mo clusterswith "looscly coordinated" site. In addition, the PPhligand is loosely coordinated to one Mo atomin direction opposite to the μ-S with Mo--P bond length of 2.647（3）. This is different from theother strocturally analogous clusters, in which the loosely coordinated ligand is trans to μ--S. Asummary of Mo--Mo and Mo-L bonding for such clusters is given.