S. Natarajan, R. Vaidhyanathan, C. Rao
May 21, 1999
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Journal
Chemistry of Materials
Abstract
Two layered tin(II) oxalate structures have been prepared by hydrothermal methods in the presence of structure-directing organic amines. The crystal data for these structures are as follows: oxalate I, [(CH3)2NH(CH2)2NH(CH3)2]2+[Sn2(C2O4)3]2-·H2O, monoclinic, space group C2/c (no. 15), a = 16.567 (8) A, b = 10.851 (6) A, c = 11.652 (6) A, β = 102.62 (3)°, V = 2039.0 (1) A3, Z = 4, M = 637.4(1), Dcalc = 2.825 g cm-3, Mo Kα, RF = 0.04; oxalate II, [C(NH2)3]2+[Sn4(C2O4)5]2-·2H2O, orthorhombic, space group Pbca (no. 61), a = 11.390 (1) A, b = 14.742 (1) A, c = 16.755 (1) A, V = 2813.1 (1) A3, Z = 8, M = 1070.8(1), Dcalc = 2.844 g cm-3, Mo Kα, RF = 0.06. In I, pseudo-pentagonal-bipyramidal SnO6 units form a puckered layered structure by sharing oxygens with the oxalate anions. The layers contain 8- and 12-membered apertures, and the amine (protonated N,N,N‘N‘-tetramethyl-1,2-diaminoethane) and water molecules are in the interlamellar region where they interact with the framework and with each other by hydroge...