The boroselenites are heteropoly anion chemical compounds containing selenite and borate groups linked by common oxygen atoms. They are not to be confused with the boroselenates with have a higher oxidation state for selenium, and extra oxygen. If selenium is replaced by sulfur, it would be a borosulfite. Boroselenites are distinct from selenoborates in which selenium replaces oxygen in borate, or perselenoborates which contain Se-Se bonds as well as Se-B bonds. The metal boroselenites were only discovered in 2012.
List namechemmwcrystal system space groupunit cell ÅvolumedensitycommentreferencesboroseleniteselenateB2Se3O10monoclinicP21/ca = 4.3466, b = 7.0237, c = 22.1460, β = 94.922; Z = 4Se2B2O7291.54orthorhombicP212121a=7.4815 b=7.8984 c=9.0478 Z=4534.653.622NLO 2.2 x KDP; band gap 4.64 eV; colourlessLi2SeB8O15419.32monoclinicP21/ca=8.641 b=16.282 c=8.415 β=94.426 Z=41180.42.3503D;stable to 280 °C; band gap 4.81 eVNaSeB3O7246.38monoclinicP21/ca=4.470 b=15.810 c=8.645 β=98.75 Z=4603.82.710layered;stable to 290 °C; band gap 4.36KSeB3O7262.49monoclinicP21/ca=4.5569 b=17.601 c=8.669 β=95.92 Z=4691.62.521layered stable to 280 °C; band gap 4.30K2Se3B2O10496.70orthorhombicPnmaa=14.1842 b=15.7516 c=4.7103 Z=41052.393.1351D; stable to 330 °C; band gap 4.75 eVRbSe3B2O9(OH)orthorhombicP212121a=4.6591 b=11.9288 c=16.332 Z=2907.73.695band gap 3.79 eVCsSe3B2O9(OH)orthorhombicP212121a=4.671 b=12.236 c=16.417 Z=21104.843.911band gap 4.17 eV; SHG 0.8 x KDPBi2[B2(SeO3)6]600.67monoclinicP21/ca=7.4594 b=7.5056 c=13.2486 β=90.04 Z=4741.755.379birefringence at 1064 nm is 0.090; 0D
References