State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China.
Dalton Trans. 2011 Mar 21;40(11):2562-9. doi: 10.1039/c0dt01512a. Epub 2011 Feb 4.
Six new phases in the alkali metal-Nb(V)/Ta(V)-Se(IV)/Te(IV)-O systems have been prepared by solid-state reactions at high-temperatures. Their structures were determined by single-crystal X-ray diffraction studies. AM(3)O(6)(QO(3))(2) (A = K, Rb, M = Nb, Ta, Q = Te; A = K, M = Nb, Q = Se) are isomorphous and their structures feature a 3D network with 1D 4- and 6-MRs tunnels along the a-axis which is composed of 2D layers of corner-sharing MO(6) octahedra bridged by QO(3) groups. The alkali metal ions are located at the above 1D tunnels of 6-MRs. The structure of Cs(3)Nb(9)O(18)(TeO(3))(2)(TeO(4))(2) features a thick Nb-Te-O layer built of corner-sharing NbO(6) octahedra, TeO(3) and TeO(4) groups. The 2D layer of the NbO(6) octahedra with 1D tunnels of 6-MRs along the c-axis are formed by 1D chains of NbO(6) chains along the c-axis and linear Nb(4)O(21) tetramers by corner-sharing. The TeO(3) and TeO(4) groups are grafted on both sides of the niobium-oxide layer via Nb-O-Te or/and Te-O-Te bridges. The caesium(i) ions are located at the above 1D tunnels of 6-MRs. TGA, UV-vis and infrared spectral measurements as well as electronic structure calculations have also been performed.
通过高温固相反应制备了碱金属-Nb(V)/Ta(V)-Se(IV)/Te(IV)-O 体系中的六个新相。通过单晶 X 射线衍射研究确定了它们的结构。AM(3)O(6)(QO(3))(2)（A=K、Rb、M=Nb、Ta、Q=Te；A=K、M=Nb、Q=Se）是同构的，它们的结构特征是具有一维 4-和 6-MR 隧道的 3D 网络，该网络沿 a 轴由 2D 层的角共享 MO(6)八面体桥接 QO(3)基团组成。碱金属离子位于一维 6-MR 隧道的上方。Cs(3)Nb(9)O(18)(TeO(3))(2)(TeO(4))(2)的结构具有由角共享 NbO(6)八面体、TeO(3)和 TeO(4)基团构建的厚 Nb-Te-O 层。具有一维 6-MR 隧道的二维 NbO(6)八面体层是由沿 c 轴的一维 NbO(6)链和通过角共享形成的线性 Nb(4)O(21)四聚体组成的。TeO(3)和 TeO(4)基团通过 Nb-O-Te 或/和 Te-O-Te 桥接接枝在铌氧化物层的两侧。Cs(i)离子位于一维 6-MR 隧道的上方。还进行了 TGA、UV-vis 和红外光谱测量以及电子结构计算。
