碘（8）砷（21）锗（25）
I(8)As(21)Ge(25).
作者信息
Ayouz Katia, Kars Mohammed, Rebbah Allaoua, Rebbah Houria
机构信息
Laboratoire Sciences des Matériaux USTHB, Faculté de Chimie, Université Houari-Boumedienne, BP 32 El-Alia, 16111 Bab-Ezzouar, Alger, Algérie.
出版信息
Acta Crystallogr Sect E Struct Rep Online. 2009 Feb 18;65(Pt 3):i15. doi: 10.1107/S1600536809004991.
Single crystals of octaiodine henacosarsenic pentacosagermanium were grown by chemical transport reactions. The structure is isotypic with the analogous clathrates-I. In this structure, the statistically occupied clathrand atoms (As,Ge)(46) form bonds in a distorted tetra-hedral coordination and their arrangement can define two polyhedra of different sizes; one is an (As,Ge)(20) penta-gonal dodeca-hedron, and the other is an (As,Ge)(24) tetra-kaideca-hedron. The guest atom (iodine) resides inside these polyhedra with site symmetry m3 (Wyckoff position 2a) and 2m (Wyckoff position 6d), respectively.
通过化学传输反应生长出了二十一砷二十五锗八碘的单晶。该结构与类似的笼形包合物-I同型。在这个结构中，统计占据的笼形主体原子（砷、锗）(46) 以扭曲的四面体配位形成键，它们的排列可以定义两个不同大小的多面体；一个是 (砷、锗)(20) 五角十二面体，另一个是 (砷、锗)(24) 十四面体。客体原子（碘）分别以点群对称性m3（Wyckoff位置2a）和2m（Wyckoff位置6d）位于这些多面体内。
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