含全双硫螯合配体簇合物的研究——Ⅱ.[Mo_2Fe_2(μ_3-S)_4(S_2CNEt_2)_5]·CH_3CN的合成、结构和性质

A Study on the Cluster Compounds with All-dithio-chelate Ligauds——II. Synthesis, Structure and Properties of [Mo_2Fe_2 (μ_3-S)_4(S_2CNEt_2)_5]·CH_3CN

在无氧非水介质中,以(NH_4)_2MoS_4,FeCl_3和NaS_2CNEt_2为原料合成了簇合物 [Mo_2Fe_2S_4(S_2CNEt_2)_5]·CH_3CN.X射线单晶结构测定表明,它具有[Mo_2Fe_2S_4]^(5+)类立方烷核心骨架。每个金属原子有一螯合基团S_2CNEt_2配位。第五个S_2CNEt_2基团在两个Mo原子间跨桥配位。XPS和Mossbauer谱的测定及M-S(M=Fe或Mo)键长比较表明,簇合物中Fe原子的氧化态是不同的,而两个Mo原子则具有相同的氧化态。该簇合物为顺磁性物质,μ_m=4.27μ_B。此外,还测定了它的红外光谱,紫外-可见光谱和催化乙炔还原活性。

In anaerobic and non-aqueous system, the cluster compound [Mo_2Fe_2S_4(S_2CNEt_2)_5]· CH_3CN has been synthesized from (NH4_)_2MoS_4, FeCl_3 and NaS_2CNEt_2. It was shown to contain a [Mo_2Fe_2S_4]^(5+) cubane-like core with a chelating ligand S_2CNEt_2 per metal atom, and both Mo atoms are bridged by the fifth S_2CNEt_2 group. XPS and Mossbauer spectral study and comparision of M—S (M=Fe or Mo) bond lengths show that both Fe atoms display different oxidation states, but both Mo atoms have the same oxidation state. The compound is paramagnetic matter, μ_m=4.27μ_B. In addition, infrared, UV- Vis spectra and catalytic activity in acetylene reduction of the compound were also determined.