Layered Compounds BaM2Ge4Ch6 (M = Rh, Ir and Ch = S, Se) with Pyrite-Type Building Blocks and Ge鈥揅h Heteromolecule-Like Anions
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- 作者：Hechang Lei ; Jun-ichi Yamaura ; Jiangang Guo ; Yanpeng Qi ; Yoshitake Toda ; Hideo Hosono
- 刊名：Inorganic Chemistry
- 出版年：2014
- 出版时间：June 2, 2014
- 年：2014
- 卷：53
- 期：11
- 页码：5684-5691
- 全文大小：502K
- 年卷期：v.53,no.11(June 2, 2014)
- ISSN：1520-510X
文摘
The structures and chemical features of layered compounds BaM2Ge4Ch6 (M = Rh, Ir; Ch = S, Se) synthesized by high-pressure and high-temperature methods have been systematically studied. These compounds crystallize in an orthorhombic phase with space group Pbca (No. 61). These compounds have the remarkable structural feature of M鈥揋e鈥揅h pyrite-type building units, stacking with Ba鈥揅h layers alternatively along the c axis. It is very rare and novel that pyrite-type subunits are the building blocks in layered compounds. Theoretical calculations and experimental results indicate that there are strongly polarized covalent bonds between Ge and Ch atoms, forming heteromolecule-like anions in these compounds. Moreover, Ge atoms in this structure exhibit an unusual valence state (+1) due to the tetrahedral coordination environment of Ge atoms along with M and Ch atoms simultaneously.