一个立方烷簇合物的合成、结构与光限幅性质(英文)

Synthesis, Structure and Optical Limiting Property of a Cubane-like Cluster (μ_3-Br)(μ_3-WSe_4)(AgPCy_3)_3

[Et4N]2[WSe4]与AgBr在三环己烷基膦(PCy3)存在下的反应得到典型的立方烷簇合物(μ3-Br)(μ3-WSe4)(AgPCy3)3,经单晶X-射线衍射测定了其结构,此结构包括一个高度扭曲的立方烷中心{WAg3Se3Br}结构,中心钨原子和每个银原子的配位几何均呈四面体构型,W…Ag平均间距为0.3027(9)nm,在激光脉冲为7ns、激光波长为532nm的条件下,最大光限幅性阈值为0.42J/cm2。

A typical cubane-like cluster,（u3-Br）（u3-WSe4）（AgPCy3）3, was synthesized from interaction of [Et,N]2[WSe4] and AgBr in the presence of PCy3 （Cy=cyclohexyl） and structurally characterized by single-crystal X-ray diffraction. The structure contains a highly distorted cubane-like {WAgsSe3Br） core. The coordination geometries of the tungsten center and each silver atom are tetrahedral. The mean W Ag separation is 0.302 7（9） nm. Large optical limiting effect with threshold of 0.42 J/cm^2 was observed with the laser pulses of 7 ns at 532 nm.