Hung Ling-I, Wang Sue-Lein, Chen Yen-Hung, Lii Kwang-Hwa
Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 300, Republic of China.
Inorg Chem. 2006 Mar 6;45(5):2100-3. doi: 10.1021/ic052154r.
A new cobalt-indium silicate, Rb6(InCo)2(Si9O26), has been synthesized via a high-temperature, high-pressure hydrothermal method and characterized by single-crystal X-ray diffraction. It crystallizes in the noncentrosymmetric orthorhombic space group Aba2 (No. 41) with a = 20.779(1) A, b = 12.0944(6) A, c = 10.7761(5) A, V =2708.1(2) A(3), and Z = 4. The structure consists of 20-membered-ring silicate single layers of corner-sharing SiO4 tetrahedra interconnected by dimers of edge-sharing CoO4 tetrahedra and InO6 octahedra into a 3D framework. The Si:O ratio for the title compound is the lowest among the known single-layer silicates. Magnetic susceptibility confirms the divalent state of the cobalt ion. The powder sample has a second-harmonic-generation signal, confirming the absence of a center of symmetry in the structure.
一种新型钴铟硅酸盐Rb6(InCo)2(Si9O26)已通过高温高压水热法合成，并通过单晶X射线衍射进行了表征。它结晶于非中心对称的正交空间群Aba2（编号41），a = 20.779(1) Å，b = 12.0944(6) Å，c = 10.7761(5) Å，V = 2708.1(2) ų，Z = 4。该结构由20元环硅酸盐单层组成，其中角共享的SiO4四面体通过边共享的CoO4四面体二聚体和InO6八面体相互连接，形成三维框架。标题化合物的Si:O比在已知的单层硅酸盐中是最低的。磁化率证实了钴离子的二价态。粉末样品具有二次谐波产生信号，证实了结构中不存在对称中心。
