New indium selenite-oxalate and indium oxalate with two- and three-dimensional structures

Two new indium(III) compounds with extended structures, [In-2(SeO3)(2)(C2O4)(H2O)(2)] center dot 2H(2)O (I) and [NH3(CH2)(2)NH3][In(C2O4)(2) center dot 5H(2)O (II), have been prepared under mild hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction, thermogravimetric analysis and infrared spectroscopy. Compound 1 crystallizes in the triclinic system, space group P-1, with a = 5.2596(11)angstrom, b = 6.8649(14)angstrom, c = 9.3289(19)angstrom, alpha = 101.78(3)degrees, beta = 102.03(3)degrees, gamma = 104.52(3)degrees, while compound II crystallizes in the orthorhombic system, space group Fdd2, with a = 15.856(3)angstrom, b = 31.183(6)angstrom, c = 8.6688(17)angstrom. In compound I, indium-selenite chains are bridged by oxalate units to form two-dimensional (2D) In-2(SeO3)(2)C2O4 layers, separated by non-coordinating water molecules. In compound II, the indium atoms are connected through the oxalate units to generate a 3D open framework containing cross-linked 12- and 8-membered channels. (C) 2008 Elsevier Inc. All rights reserved.