Institut für Nanotechnologie, Karlsruher Institut für Technologie, Postfach 3640, 76021 Karlsruhe, Germany.
J Chem Phys. 2010 Jun 7;132(21):211102. doi: 10.1063/1.3442411.
The gas phase structures of tin cluster anions Sn(n)(-) have been studied by a combination of trapped ion electron diffraction and density functional theory calculations. In the size range of n=18-25 these clusters comprise dimers of stable subunits. In particular Sn(18)(-) and Sn(20)(-) are homodimers of Sn(9) and Sn(10) subunits, respectively. In Sn(23)(-) two Sn(10) units are linked by three additional bridging atoms and Sn(25)(-) is a heterodimer of Sn(10) and Sn(15) subunits. This rather unexpected growth mode is rationalized by the extraordinary stability of the building blocks Sn(9), Sn(10), and Sn(15).
锡团簇负离子 Sn(n)(-) 的气相结构已通过被困离子电子衍射和密度泛函理论计算的组合进行了研究。在 n=18-25 的尺寸范围内，这些团簇由稳定亚基的二聚体组成。特别是 Sn(18)(-) 和 Sn(20)(-) 分别是 Sn(9) 和 Sn(10)亚基的同源二聚体。在 Sn(23)(-) 中，两个 Sn(10)单元通过三个额外的桥接原子连接，Sn(25)(-) 是 Sn(10)和 Sn(15)亚基的杂二聚体。这种相当出人意料的生长模式可以通过构建块 Sn(9)、Sn(10)和 Sn(15)的非凡稳定性来合理化。
