Bi2(IO3)(IO6): First combination of [IO3]− and [IO6]5− anions in three-dimensional framework

A new bismuth (III) iodate periodate , Bi 2 (IO 3 )(IO 6 ) was obtained from hydrothermal reactions using Bi(NO 3 ) 3 ·5H 2 O, and H 5 IO 6 as starting materials. Bi 2 (IO 3 )(IO 6 ) crystallizes in the monoclinic space group P 2 1 / c (No. 14) with lattice parameters ɑ  = 8.1119(6), b  = 5.4746(4), c  = 16.357(1) Å, β  = 99.187(2)°, V  = 717.07(9) Å 3 , Z  = 4. The structure of Bi 2 (IO 3 )(IO 6 ) features a three-dimensional framework which is a combination of [Bi(1)O 5 ] tetragonal pyramids, [Bi(2)O 8 ] bicapped trigonal prisms and [IO 3 ] − and [IO 6 ] 5− anions. Thermal analysis shows that the compound is thermally stable up to about 350 °C. The solid state UV-vis-NIR diffuse reflectance spectrum indicates that Bi 2 (IO 3 )(IO 6 ) is a semiconductor with a band gap of 2.76 eV.