四核钴铁簇合物Co_3Fe(mp)_4(Hmp)(PBu_3~n)_3的FAB质谱研究(Hmp=2-巯基苯酚,Pbu_3~n=三正丁基膦

Fast Atom Bombardment (FAB) Mass Spectra Studies of Polynuclear Metal Cluster Complex [Co_3Fe (mp)_4 (Hmp) (Pbu_3~n)_3]

本文选择质量为1460μ且金属原子具有三种不同配位环境的四核钴铁簇合物Co3Fe（mp）4（Hmp）（PBu）3（Hmp＝2-巯基苯酚，PBu＝三了基膦）为研究对象，以快原子轰击软电离方法，研究其质谱断裂行为及其可能的裂解途径。

The positive Ion FAB-MS of Cluster complex Co3Fe (mp)4 (Hmp) (PBu)3 (H2mp＝2－mercaptophenol, PBu＝tri－n－butylph0sphine ) are reported. In the light of thespectra and the molecular structural date the major fragmentation pathways are proposed.The peak is represented by m/z 1463 which corresponds to the cation[Co3Fe (mp)4(Hmp) (PBu)3]·3H or[Co4Fe (mp)4 (Hmp) (PBu)3]. The latter ion may be ratherrational and it is related to the metal exchange reaction of Co/Fe occurring in the matrixas a result of exposure to the FAB beam. The Competitive cleavage of Hmp and PBufrom the molecular ion occurred later and the cations [FeCo3 (mp)4 (PBu)3]＋(m/z1335) and [FeCo3 (mp)4(Hmp) (PBu)2]＋(m/z 1258 ) were observed, respectively. Thelatter ion then cleaved by either Hmp or Fe (Hmp) and PBu to give [Co3Fe (mp)4(PBu)2] (m/z 1133 )or [Co3 (mp)4 (PBu)]＋(m/z 875 ), respectively.