三核钼簇合物的质谱研究

study on Mass Spectra of Trinuclear Molybdenum Clusters

本文通过快原子轰击质谱研究[Mo_3S_7(dtp)_3]Cl(dtp=S_2P(OEt)_2),获得去Cl原子含有簇芯Mo_3S_7的系列碎片离子。又通过化学衍生方法,对难汽化的[Mo_2S_4(dtp)_4)Py簇合物进行化学修饰,获得易挥发的[Mo_3S_4(RCO_2)(dtp)_3]Py,其中R=H,C_2H_5,Py=NC_5H_5。该簇合物的电子轰击谱表明,除按正常的单分子分解而出现的系列碎片离子外,还发现该簇合物中μ_3—S被μ_3—O取代质量数相差16amu系列碎片离子簇峰即[Mo_3OS_3(RCO_2)_(1→0)(dtp)_(3→2)]^+。最后,对O帽取代S帽的可能机制作了探讨。

The paper reported fast bombardment mass spectra of [Mo_3 S_7 (S_2P(OEt)_2)_3] C1 and obtained satistactory mass spectra. The spectra exhibit six very broad peak groups over a wide range of m/z values for each ion species due to the polyisotopic character of Mo but also ^(13)C and ^(24)S. We also obtained satisfactory mass spectra when using conventional electron impact ionization mass spectra for [Mo_3 S_4 (RCO_2) (S_2P (OEt)_2)_3] Py (R=H, C_2H_5, Py=NC_5H_5). It is found that two types of broad peak groups which come from [Mo_3 OS_3(RCO_2)(S_2P(OEt_2)_3]Py due to theμ_3—S atom exchanged with μ_3—O atom in [Mo_3S_4(RCO_2)(S_2P(OEt)_2)_3Py and according to normal unimolecular ion decomposition of [Mo_3S_4 (RCO_2) (S_2P (OEt)_2)_3]Py. Finally we discussed the problem about the 'oxygen-source' in the experiment of mass spectrometry.