Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany.
Inorg Chem. 2013 Sep 3;52(17):9720-6. doi: 10.1021/ic3024315. Epub 2013 Aug 14.
Type-I clathrates Rb(8-x-t)K(x□t)Au(y)Ge(46-y) are synthesized from Rb4Ge9, K4Ge9, Au, and Ge. Crystal structures and compositions are determined by single-crystal and powder X-ray diffraction methods. The lattice parameters are 10.8103(2), 10.7956(2), 10.7850(2), and 10.7723(2) Å in space group Pm3n for Rb7.88(2)Au2.47(2)Ge43.53(2), Rb3.69(4)K4.31(4)Au2.17(2)Ge43.83(2), Rb1.66(5)K6.34(5)Au2.17(1)Ge43.83(1), and K6.71(4)Au2.28(2)Ge43.72(2), respectively. Bonding analysis for Rb8Au6Ge40 suggests ionic interaction of Rb with the framework besides covalent interactions between Ge and Au/Ge. Rb7.88Au2.47Ge43.53 and K6.71(4)Au2.28Ge43.72 are both diamagnetic. The heat capacity of K6.71Au2.28Ge43.72 is analyzed. Transport properties of Rb7.88Au2.47Ge43.53 reveal n-type conducting, and low thermal conductivity.
I 型笼合物 Rb(8-x-t)K(x□t)Au(y)Ge(46-y) 是由 Rb4Ge9、K4Ge9、Au 和 Ge 合成的。晶体结构和组成通过单晶和粉末 X 射线衍射方法确定。晶格参数分别为 10.8103(2)、10.7956(2)、10.7850(2)和 10.7723(2)Å，空间群为 Pm3n，对于 Rb7.88(2)Au2.47(2)Ge43.53(2)、Rb3.69(4)K4.31(4)Au2.17(2)Ge43.83(2)、Rb1.66(5)K6.34(5)Au2.17(1)Ge43.83(1)和 K6.71(4)Au2.28(2)Ge43.72(2)。对于 Rb8Au6Ge40 的键合分析表明，Rb 与骨架之间存在离子相互作用，除了 Ge 和 Au/Ge 之间的共价相互作用。Rb7.88Au2.47Ge43.53 和 K6.71(4)Au2.28Ge43.72 均为抗磁性。分析了 K6.71Au2.28Ge43.72 的热容。Rb7.88Au2.47Ge43.53 的输运性质表明为 n 型导电，热导率低。
