羰基原子簇化合物M3(CO)12(M=Fe,Ru,Os)的激光解离研究

在自制的仪器上以冲激光溅射铁、钌、锇的三核羰基原子簇化合物。由原位质谱观察和分析溅射产生的正负离子。比较了解离碎片及分布发现羰基锇原子簇化合物具有特殊的结构稳定性。它们不仅具有很强的金属键，而且锇与羰基分子还形成了很强的配位键。

Laser-induced Dissociation of Carbonyl Cluster Compounds, M3(CO)12 (M=Fe,Ru,Os)

Trinuclear carbonyl cluster compounds of Fe, Ru and Os were vaporized, ionized and dissociated by pulsed laser beam. The positive and negative ions were observed and studied by in situ mass spectroscopy. After comparison of their fragments distribution, it can be found that the osmium clusters have the special structural stability. Not only do they have the strong metal metal bonds, but also very strong coordination bonds formed between the metal atoms and the carbonyl groups. Therefore, when the cluster dissociates, it loses a pair of oxygen atoms at first and forms a C 2 bridged compound, unlike the clusters of iron or ruthenium which loses the carbonyl groups and fragments into dinuclear or even single nuclear radicals. The spectra also revealed the significant difference between the positive ions and the negative ones. In the recorded mass spectra, the molecular ion peak of the positive ions can be observed, but only fragment ions of the negative ions can be observed.