An open-framework three-dimensional indium oxalate: [In(OH)(C2O4)(H2O)]3·H2O

By hydrothermal reaction of In2O3 with H2C2O4·2H2O in the presence of H3BO3 at 155 °C, an open-framework three-dimensional indium oxalate of formula [In(OH)(C2O4)(H2O)]3·H2O (1) has been obtained. The compound crystallizes in the trigonal system, space group R3c   with a=18.668(3)Å, c=7.953(2)Å, V=2400.3(7)Å3, Z=6Z=6, R1=0.0352R1=0.0352 at 298 K. The small pores in 1 are filled with water molecules. It loses its filled water at about 180 °C without the change of structure, then the bounded water at 260 °C, and completely decompounds at 324 °C. The residue is confirmed to be In2O3.

Graphical abstractAn open-framework three-dimensional indium oxalate [In(OH)(C2O4)(H2O)]3·H2O (1) was synthesized by hydrothermal reaction. Disordered water molecules are filled into the channels. It crystallizes in the trigonal system with space group R3c  , a=18.668(3)Å, c=7.953(2)Å at 298 K.Figure optionsDownload full-size imageDownload as PowerPoint slide