摘要
本文通过电子轰击谱,并借助于同位素丰度分析和亚稳跃迁数据,阐述了标题衍生物(MeCp)Zr(S_2CN(C_7H_7)_2)_3(Ⅰ)、CpZr(S_2CN(C_7H_7)_2)_3(Ⅱ)、(MeCp)_2ZrCl(S_2CN(C_7H_7)_2)(Ⅲ)和Cp_2ZrCl(S_2CN(C_7H_7)_2)(Ⅳ)的质谱断裂途径。对于配合物(Ⅰ)和(Ⅱ),可看到从分子离子中首先丢失N,N-二苄基氨荒酸配体或该配体的部分碎片离子(C_7H_7^+),构成两个配合物的主要断裂途径。而丢失Cp或MeCp配体,在两种配合物质谱中则有差别。一般地说,Cp较MeCp易于丢失。这可能由于MeCp比Cp有较强给电子能力,因而使配体与金属间键得以加强。对于配合物(Ⅲ)和(Ⅳ),上述关系不明显。在配合物(Ⅳ)中,通过同位素丰度分析,指明m/z 462和m/z 463两种不同离子组成的两簇峰相互重叠,构成观察到的一簇叠加同位素峰。
Electron bombardment mass spectra of the title complexes are studied by the isotopic abundance analysis and the data of metastable transition. The investigation on complexes (Ⅰ) and (Ⅱ) indicates that the molecular ion loses first the (N ,N-dibenzyldithiocarbamato) ligand or partial fragment ion of that ligand (C7H7+). On the other hand , the situation of the loss of C5H5 or CH3C5H4 ligand is different from each other for the complexes (Ⅰ) and (Ⅱ). Generally, ligand CH3C5H4 is stronger than C5H5 when bonded to metal atom. For complexes ( Ⅲ ) and ( Ⅳ ), however, there is no such clean-cut relation between them. The isotopic abundance analysis of the complex (Ⅳ ) shows that the m/z 463 and m/z 462 represent distinct cluster peaks of two chemical species which overlap with each other to form m/z 462 -m/z 471 cluster peaks of the observation.
