title: Flux synthesis, crystal structures, and solid-state NMR spectroscopy of two indium silicates containing varied In-O coordination geometries.
abstract: Two novel indium silicates, K5In3Si7O21 (1) and K4In2Si8O21 (2), have been synthesized by a flux-growth method and characterized by single-crystal X-ray diffraction. The structure of 1 consists of siebener single chains of corner-sharing SiO4 tetrahedra running along the b axis linked via corner-sharing by In2O9 face-sharing octahedral dimers and InO5 trigonal bipyramids to form a 3D framework. The structure of 2 consists of a 3D silicate framework containing 6- and 14-ring channels. InO5 square pyramids are located within the 14-ring channels sharing corners with the silicate framework. The solid-state 29Si MAS NMR spectrum of compound 1 was recorded; it shows the influence of the indium atoms in the second coordination sphere of the silicon on the chemical shift. Crystal data: 1, orthorhombic, Pna21 (No. 33), a = 12.4914(3) A, b = 16.8849(3) A, c = 10.2275(2) A, V = 2157.1(1) A3 and Z = 4; 2, monoclinic, P21/n (No. 14), a = 8.4041(3) A, b = 11.4919(4) A, c = 10.4841(3) A, beta = 90.478(2) degrees , V = 1012.5(1) A3 and Z = 2.
authors: Department of Chemistry, National Central University, Chungli, Taiwan 320, ROC.
authors: Ling-I
authors: LI
authors: Hung
authors: Sue-Lein
authors: SL
authors: Wang
authors: Hsien-Ming
authors: HM
authors: Kao
authors: Kwang-Hwa
authors: KH
authors: Lii
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D007204:Indium / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D012680:Sensitivity and Specificity; D017640:Silicates / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D017640:Silicates; D007204:Indium; D010100:Oxygen