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Selenite and tellurite compounds have garnered a lot of attention in both fundamental and applied chemistry. Se4+ and Te4+ cations possess lone pair electrons, which change the coordination environments and performance of these compounds. Here, three new transition metal selenite and tellurite compounds, MSe2O6 (M = Zr, Hf) and HfTe3O8, have been obtained by conventional hydrothermal reactions. The crystallographic structures of the three compounds are discussed in detail; meanwhile, thermal analysis, optical spectra, birefringence and theoretical calculations are also reported. Isostructural ZrSe2O6 and HfSe2O6 exhibit partially distorted octahedral and tetrahedral configurations. Moreover, ZrSe2O6 and HfSe2O6 have birefringence (Δn = 0.1052, 0.096) and short UV cut-off edges (212, 208 nm), and compared with ZrSe2O6, the thermal stability of HfSe2O6 is slightly larger. ZrSe2O6 and HfSe2O6 are adequate candidates as birefringent crystals in the UV region. Remarkably, HfTe3O8 not only has high thermal stability, but also provides a short UV cut-off edge (234 nm). It can meet the multiple requirements of the developing photoelectric system for UV window materials and has broad application prospects. Furthermore, the intrinsic relationship between the physical properties of the three crystals and their unique electronic structures is revealed. [ABSTRACT FROM AUTHOR]

Selenite and tellurite compounds have garnered a lot of attention in both fundamental and applied chemistry. Se4+ and Te4+ cations possess lone pair electrons, which change the coordination environments and performance of these compounds. Here, three new transition metal selenite and tellurite compounds, MSe2O6 (M = Zr, Hf) and HfTe3O8, have been obtained by conventional hydrothermal reactions. The crystallographic structures of the three compounds are discussed in detail; meanwhile, thermal analysis, optical spectra, birefringence and theoretical calculations are also reported. Isostructural ZrSe2O6 and HfSe2O6 exhibit partially distorted octahedral and tetrahedral configurations. Moreover, ZrSe2O6 and HfSe2O6 have birefringence (Δn = 0.1052, 0.096) and short UV cut-off edges (212, 208 nm), and compared with ZrSe2O6, the thermal stability of HfSe2O6 is slightly larger. ZrSe2O6 and HfSe2O6 are adequate candidates as birefringent crystals in the UV region. Remarkably, HfTe3O8 not only has high thermal stability, but also provides a short UV cut-off edge (234 nm). It can meet the multiple requirements of the developing photoelectric system for UV window materials and has broad application prospects. Furthermore, the intrinsic relationship between the physical properties of the three crystals and their unique electronic structures is revealed. [ABSTRACT FROM AUTHOR]