Indium Sulfate Tellurites Synthesized

Indium Sulfate Tellurites Synthesized


Nonlinear optical (NLO) materials can, for example, double the frequency of light passing through them. This effect, also called second harmonic generation (SHG), can only occur in compounds with a non-centrosymmetric crystal structure. However, centrosymmetric structures are much more common than non-centrosymmetric ones in inorganic crystals.

Fang Kong, State Key Laboratory of Structural Chemistry, Chinese Academy of Sciences, Fuzhou, and colleagues have searched for new non-centrosymmetric structures in inorganic chemistry. The team synthesized two previously unknown indium sulfate tellurites: In2(SO4)(TeO3)(OH)2(H2O), which is centrosymmetric, and In3(SO4)(TeO3)2F3(H2O), which is non-centrosymmetric. The compounds were prepared via hydrothermal reactions of In2O3, TeO2, H2SO4, and HF (the latter only for the fluoride).

The team characterized the compounds using powder X-ray diffraction (PXRD) and infrared (IR) and UV–Vis–NIR spectroscopy, among other methods. They found that the fluoride-free compound has a 2D layered structure. In3(SO4)(TeO3)2F3(H2O) consists of indium tellurite layers which are bridged by sulfate tetrahedra to form a 3D network. It acts as an NLO but has a low frequency-doubling efficiency.


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