Web Release Date: March 20,
Flux Synthesis, Crystal Structures, and Solid-State NMR Spectroscopy of Two Indium Silicates Containing Varied In-O Coordination Geometries
and
Department of Chemistry, National Central University, Chungli, Taiwan 320, ROC, Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 300, ROC, and Institute of Chemistry, Academia Sinica, Nankang, Taipei, Taiwan 115, ROC
Received January 9, 2007
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) Å, b = 16.8849(3) Å, c = 10.2275(2) Å, V = 2157.1(1) Å3 and
Z = 4; 2, monoclinic, P21/n (No. 14), a = 8.4041(3) Å, b = 11.4919(4) Å, c = 10.4841(3) Å, 
= 90.478(2)
, V
= 1012.5(1) Å3 and Z = 2.
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