NEt_4V_2Fe_2S_4(Me_2dtc)_5族合物的FAB质谱研究(Me_2dtc=S_2CNMe_2)
Fast Atom Bombardment Mass Spectrometry of Metal Cluster Compound NEt_4V_2Fe_2S_4(Me_2dtc)_5(Me_2dtc=S_2CNMe_2)
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摘要: 本文报道了标题簇合物阴离子V2Fe2S4（Me2dtc）5-在FAB质谱条件下，存在两种不同的质谱断裂方式：（1）保持簇阴离子骨架，逐步失去配体Me2dtc或其它碎片NMe2而生成的各级碎片离子；（2）破坏簇阴离子V2Fe2S4（Me2dic）5的骨架，即沿簇阴离子的薄弱的M（金属）-S（无机硫）键，劈裂为两个亚簇而产生的碎片离子，以及由碎片重组反应而生成的碎片离子m／z296（8．47％）Fe（Me2dtc）2．本文还讨论了簇阴离子在簇解还原过程中，金属原子及其簇芯表观氧化态变化。Abstract: The paper reports two degradation patterns of metal cluster V2Fe2S4(Me2dtc)5-in FABMS: (1)the cluster skeleton is preserved but stepwisely lost the ligand Me2dtc or other fragment NMe2；(2)the cubane-like cluster V2Fe2S4(Me2dtc)5- is cracted into two sub-cluster fragment ions along the weaker metal -sulphur bonds in the cubane skeleton. These FABMS also exhibit fragment ion Fe (Me2dtc)5 resulting from the re-combination reactions of fragment species.
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