Hydrothermal synthesis, crystal structures, and optical properties of H[Bi3O(Te3O9)](NO3)2 and [Bi2(TeO3)2](SO4)

Abstract

Two new mixed bismuth (III) tellurite nitrate/sulfate, H[Bi3O(Te3O9)](NO3)2 and [Bi2(TeO3)2](SO4) were synthesized under hydrothermal conditions. H[Bi3O(Te3O9)](NO3)2 crystallizes in the hexagonal space group P6¯ 2 m (No. 189) with lattice parameters a = 9.8465(4), b = 9.8465(4), c = 4.1917(4) Å, V = 351.95(4) Å3, Z = 1, while [Bi2(TeO3)2](SO4) crystallizes in the monoclinic space group C2/c (No. 15) with lattice parameters a = 15.7657(13), b = 7.4285(5), c = 8.0959(6) Å, β = 112.693(2)°, V = 874.75(11) Å3, Z = 4. The structure of H[Bi3O(Te3O9)](NO3)2 features one-dimensional cationic 1∞[Bi3O(Te3O9)]+ chains along c axis, which are composed of [BiO7] and [TeO4] polyhedra by sharing corners and edges, whereas [Bi2(TeO3)2](SO4) possesses a new three-dimensional framework consisting of two-dimensional zigzag layers of 2∞[Bi2(TeO3)2]2+ that are linked by SO42- anions. Title compounds were characterized by single-crystal X-ray diffraction, powder X-ray diffraction, Raman spectra, infrared spectra and solid state UV-vis-NIR diffuse reflectance spectroscopy.