物理化学学报 >> 1993, Vol. 9 >> Issue (06): 808-814.doi: 10.3866/PKU.WHXB19930616

研究论文 上一篇    下一篇

铁硫二元团簇的产生及其紫外光解

于忠德; 张南; 冯万勇; 武小军; 高振; 朱起鹤; 孔繁敖; 郑兰荪; 黄荣彬   

  1. 分子反应动力学国家重点实验室,中国科学院化学研究所,北京 100080;厦门大学化学系厦门 361006
  • 收稿日期:1992-08-09 修回日期:1993-12-16 发布日期:1993-12-15
  • 通讯作者: 高振

The Production and UV Photodissociation of Iron-sulfur Binary Clusters

Yu Zhong-De; Zhang Nan; Feng Wan-Yong; Wu Xiao-Jun; Gao Zhen; Zhu Qi-He; Kong Fan-Ao; Zheng Lan-Sun; Huang Rong-Bin   

  1. State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080; Department of Chemistry, Xiamen University, Xiamen 361006
  • Received:1992-08-09 Revised:1993-12-16 Published:1993-12-15
  • Contact: Gao Zhen

摘要: 用激光蒸发固体样品的方法产生了各种铁硫原子簇离子Fe_nS_m~+(n=1—13, m=1—13), 并且用串级飞行时间质谱仪研究了这些团簇离子的紫外激光解离规律. 实验发现, 所有组成为m=n, m=n-1与m=n+5的离子均具有较大的丰度, 表明它们具有较好的稳定性. 各种Fe_nS_m~+离子的紫外光解结果显示出, 当n<n)离子的结构为在Fe_nS_n~+核心外围再键合上其他的S原子.

关键词: 铁硫原子簇, 激光蒸发, 紫外光解, 串级飞行时间质谱仪

Abstract: The iron-sulfur cluster ions, Fe_nS_m~+(n=1-13, m=1-13), were produced by diredt laser vaporization of a solid sample containing a mixture of iron and sulfur powder. UV photodissociation of the cluster ions was studied with a tandem time-of-flight mass spectrometer. It was found that all the cluster ions with compositions of m=n, m=n-1 or m=n+5 have relatively larger abundaces, indicating that they were more stable. The photodissociation results of Fe_nS_m~+ ions showed that, when n≈m, the main channels were losses of neutral S atoms until n≈m, while for parent ions with n≈m, the main product ions have the m=n or m=n-1 compositions. Form these experimental results, it was proposed that the Fe_nS_n~+ ions might have structures similar to those of the Fe_nS_n cores in iron-sulfur proteins, while the structures of the Fe_nS_m~+ (m>n) cluster ions could be considered to have a pattern of the Fe_nS_n~+ cores with some peripheral S atoms.

Key words: Iron-surfur clusters, UV-Photodissociation, Laser vaporization, Tandem time-of-flight mass spectrometer