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Hydrothermal synthesis of two layered indium oxalates with 12-membered apertures

2003; Elsevier BV; Volume: 173; Issue: 2 Linguagem: Inglês

10.1016/s0022-4596(03)00139-7

1095-726X

Zhenxia Chen, Yaming Zhou, Linhong Weng, Haoyu Zhang, Dongyuan Zhao,

Mesoporous Materials and Catalysis

Two layered indium oxalates, In(C2O4)2.5(C3N2H12)(H2O)3, I, and In(C2O4)1.5(H2O)3, II, have been hydrothermally synthesized. In I, the linkage between indium and oxalate units gives rise to a sheet with a rectangular 12-membered aperture (six indium atoms and six oxalate units). Indium atom of II has an unusual pentagonal bipyramidal coordination arrangement. The connectivity between indium and oxalate units forms a neutral puckered layer with 12- (along a-axis) and eight-membered (along b-axis) apertures. Crystal data for these two indium oxalates are as follows: I, triclinic, space group: P-1 (No. 2), a=8.725(3) Å, b=9.170(3) Å, c=9.901(3) Å, α=98.101(4)°, β=97.068(4)°, γ=102.403(4)°, V=756.3(4) Å3, Z=2, M=463.0(5), ρcalc=2.042 g/cm3, R1=0.0377, wR2=0.0834. II, monoclinic, space group: P21/c (No. 14), a=10.203(5) Å, b=6.638(1) Å, c=11.152(7) Å, β=95.649(4)°, V=751.7(4)Å3, Z=4, M=300.9(0), ρcalc=2.659 g/cm3, R1=0.0229, wR2=0.0488. TG analyses indicate the water molecules of I can be removed at 150°C. The dehydrated product retains structural integrity.