Organic template-directed indium phosphite-oxalate hybrid material: Synthesis and characterization of a novel 3D [C6H14N2][In-2(HPO3)(3)(C2O4)] compound with intersecting channels

A novel anionic three-dimensional indium phosphite-oxalate hybrid material, formulated as [C6H14N2][In-2(HPO3)(3)(C2O4)] (1) was prepared under hydrothermal conditions by using 1.4-diazabicyclo[2.2.2]octane (dabco) as a structure directing agent (SDA). Single-crystal X-ray diffraction analysis reveals that compound I crystallizes in the orthorhombic system space group Pna2(1) (No. 33) having unit cell parameters a = 12.4143(13) angstrom, b = 7.7166(8) angstrom, c = 18.327(2) angstrom, V = 1755.6(3) angstrom(3), and Z = 4 with R-1 = 0.0282, wR(2) = 0.0632. The novel 3D open framework is constructed from InO6 octahedra, HPO3 pseudo-tetrahedra and C2O4 units. The assembly of these building units generates intersecting 8- and 12-membered ring (MR) channels along two different directions. To the best of our knowledge, it is the first reported indium phosphite-oxalate hybrid material. Further characterization of compound 1 was performed using X-ray powder diffraction (XRD), infrared (IR) spectra, thermal gravimetric analyses (TGA), inductively coupled plasma (ICP) and elemental analyses. (C) 2009 Elsevier B.V. All rights reserved.