Syntheses, crystal structures and photo luminescence properties of three novel organically bonded indium selenates or selenites

Three new organically bonded indium(III) selenates or selenites, namely, In-2(2,2 '-bipy)(2)(SeO4)(3)(H2O)(2)center dot 2H(2)O (1), In-2(2,2 '-bipy)(2) (SeO4)(C2O4)(2)center dot 0.5H(2)O (2) and In-2(2,2 '-bipy)(2)(SeO3)(2)(C2O4) (3) (2,2 '-bipy = 2,2 '-bipyridine) have been synthesized by hydro/solvothermal reactions by using the in situ ligand synthesis technique (2 and 3) and structurally characterized. The structure of compound 1 features a dimer composed of two InO4N2 octahedra bridged by three SeO4 tetrahedra via cornering sharing. The structure of compound 2 shows a 2D inorganic-organic hybrid layer in which the indium (III) ions are bridged by both selenate and oxalate anions, whereas the structure of compound 3 possesses a 2D inorganic-organic hybrid layer composed of the indium (III) ions interconnected by both selenite and oxalate anions. The adjacent layers are further interconnected via pi...pi interactions between the bipy ligands. Compound 1 displays an intra-ligand luminescent emission band at lambda(max) = 360 rim whereas compounds 2 and 3 both exhibit intra-ligand luminescent emission bands at lambda(max) = 389 nm. (c) 2007 Elsevier Inc. All rights reserved.