低价双核Mo—S—CO簇合物的质谱研究

本文报道了二个低价钼簇合物的快原子轰击(FAB)和电子轰击(EI)质谱:(Et_4N)_2Mo_2(CO)_8(μ-SPh)_2]的FAB和FAB—NI谱及Mo_2(CO)_8(μ-SPh)_2的FAB和EI谱。分别获得它们的完整的配位阳离子和阴离子峰。这类簇合物的大致裂断解途径可能是首先脱CO、然后脱C_6H_5—,在EI—MS谱中观察到双金属离子裂解为单金属碎片离子的反应。文中探讨了质谱条件下标题簇合物的氧化还原反应。研究结果同时表明,Mo价态明显影响碎片离子峰的相对丰度和Mo对配位体CO、—SPh、—S的络合能力。另外,还报道了Mo_2(CO)_6(μ-SPh)_2(CH_3CN)_2的FAB—MS和EIMS谱。

Studies on the Mass Spectra of Dinuclear Mo-S-CO Clusters Containing Low valence Mo Atoms

The Fast Atom Bomlardement (FAB) and Electron Impact (EI) mass spectra of two dinu-clear Mo-S-CO cluster containing low-valence Mo atoms ,Et4N]Mo2(CO)8(μ-SPh)2] and CMo2(CO)8(μ-SPh)2], have been measured and their complete cation and anion peaks have been obtained respectively. The fragmentation pathway of this type of clusters involves the elimination of CO at first and then of -C6H5. The cleavage of dimsetallic ion to monometallic fregment was observed in their EI mass spectra. The fedox reaction of this type of clusters under MS condition was discussed. The results indicated that the oxidation state of Mo atoms obviously influnced the relative abundance of the fregment ion peaks and the coordination ability of Mo atoms to the lig-ands CO, - SPh and - S. In addition, the FAB -MS and EINMS of Mo2 (CO)6 (μ-SPh)2 (CH3CN)2 was also reported.