摘要
进行了系列同三核羧酸配合物〔M3O(O2CR)6Py3〕X(M=Cr,Mn,Fe;R=CH3,C2H5,C6H5;X=Cl-,ClO4-;Py为吡啶)的快原子轰击质谱(FAB-MS)研究。获得了包括配位吡啶在内的完整阳离子峰。在研究其断裂规律时,主要观察到4个系列碎片离子:Ⅰ.〔M3O(O2CR)n〕+,n=6~2;Ⅱ.〔M3O(O2CR)nO〕+,n=5~1;Ⅲ.〔M2O(O2CR)n〕+,n=3~1;Ⅳ.〔M2(O2CR)n〕+,n=4~2。通过对该系列配合物质谱断裂过程的比较和分析,获得了配合物稳定性随金属离子及配体的变化如下:金属离子,Cr>Mn>Fe;桥配基,-CH3CO2>-C2H5CO2>-C6H5CO2;端配基,Py>H2O。本研究及先前的工作〔1,8〕还为某些三核铬,铁羧酸配合物在以乙炔加水或加氢为探针反应中存在活性物种:〔Cr3O(O2CR)3~4〕。
A series of trinuclear carboxylato complexes M3O(O2CR)6Py3X (M=Cr, Mn, Fe; R=CH3, C2H5; X=Cl-, ClO4-; Py=pyridine) are studied by the Fast Atom Bombardment Mass Spectra (FABMS), and the results are reported in this paper. Five series of the fragmentation ions M3O(O2CR)n+(n=6 ̄2), M3O(O2CR)nO+ (n=5 ̄1), M2O(O2CR)n+(n=3 ̄1), M2(O2CR)n+(n=4 ̄2), M3O(O2CR)nNBA-1+(n=5 ̄3)(NBA=mnitrobenzyl alcohol) have been identified mainly from their mass spectra. On the basis of the study of fragmentation regularity some useful investigation on the structural chemistry and stability of the complexes are carried out.\;
基金
国家自然科学基金
关键词
快原子轰击质谱
羧酸配合物
铬
锰
铁
配合物
FABMS, carboxylato complex, chromium complex, manganese complex, iron complex