A new three-dimensional microporous indium arsenate has been synthesized for the first time from the hydrothermal reaction of H2O, InCl3.4H2O, H3AsO4 and C6H12N2.6H2O. Single crystal X-ray diffraction studies show that it has an orthorhombic (symmetry space group Pbca), with a=0.9090(4) nm, b=1.0344(4) nm, c=1.0468(4) nm. It's asymmetry unit is InAsO4(H2O)2, which produces a 4-ring and 6-ring 1D channel along the a and b axis, respectively. It also contains a cage-like structrue surrounded by 4, 6, 8-rings. The organic amine is not occluded in the structure. This structure is the first indium arsenate analog of InPO4-1.

Key words: MICROBORE MATERIALS, DIRECTING AGENT, HYDRO-THERMAL METHOD, PROPANAMINE P, THREE DIMENSIONAL STRUCTURE, CRYSTAL STRUCTURE, INDIUM COMPOUNDS, ARSENATE