甲川三钴九羰基衍生物的质谱研究

本文报导了四个甲川三钻九羰基衍生物Co_3(CO)_9CR(R=H,Cl,CH_3和C_6H_5)的质谱研究,并根据它们的结构和在第一无场区亚稳离子的测量结果讨论它们的主要断裂特征。这些衍生物在EI条件下均可获得明显的分子离子。在连续丢失CO后形成一系列碎片离子Co_3(CO)_(9-n)CR]~+(n=0—9);Co_3CR]~+的二次断裂反应先是Co—Co键断裂,接着失去一个Co原子形成相应的碎片离子,这些产物离子多数以含金属碳化物离子出现;含苄川基金属碎片离子的二次断裂则以连续失去C_2H_2为特征。

Studies of Mass Spectra of Methenyltricobaltennea carbonyls

The mass Spectra of four methenyltricobaltenneacarbonyls,Co3 (CO)9CR(R = H,CL,CH3 and C6H5) ,are reported. Their fragmentation pathways are proposed based on their known structure and the measurement of the metastable transition. The molecular ion peaks of four derivatives are clearly ob- served. Initially,the parent ions progressively lose carbon monoxide to form CCo3(CO)9-nCR]+(n=1 ~9). Secondary cleavage reaction of Co3CR+ ions is characteristic of prior breaking the Co-Co bond and losing a cobalt atom to form the relative fragment. The ionic products in these cleavage reactions are mainly the metal-containing carbide ions. While the fragmentation of benzylidyne-containing metal fragments is charactered by loss of C2H2.