Ammonium hexamolybdenoindate(III) hydrate was synthesized and studied by IR
spectroscopy and X-ray crystallography. The crystals of the compound are o
rthorhombic with a = 11.034 Angstrom, b = 11.323 Angstrom, c = 5.903 Angstr
om (+/-0.003 Angstrom), Z = 1, d(calc) = 3.125 g/cm(3). According to the mo
lar conductivity of solutions and IR spectra, the compound is a poorly solu
ble crystal hydrate with the coordination formula (NH4)(3)[InMoO6O18(OH)(6)
] . 10H(2)O. Its solubility in water was determined. Thermal stability of t
he compound was studied by thermogravimetry.