Anew noncentrosymmetric polyborate, Ba-2[B6O9(OH)(4)], has been synthesized under a hydrothermal condition. The polyborate contains chirallayers constructed by two kinds of helical chains and also form newB18O42 circles basedon B3O8 units [(3: Delta+2T)]. One kind of Ba atom locates in the cavity surrounded by the B11O11 ring within the anion layer, and the other kind of Ba atom inserts between two adjacent layers. UV-vis diffuse reflectance spectroscopy demonstrates that the compound has a cutoff edge below 190 nm and has a large second-harmonic generation (SHG) effect, which is approximately 3 times that of KH2PO4 (KDP) and is type-I phase matchable
Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Xinjiang Key Lab Elect Informat Mat & Devices, Urumqi 830011, Peoples R China;Xinjiang Normal Univ, Coll Chem & Chem Engn, Urumqi 830054, Peoples R China
Wang Li,Pan Shilie,Chang Lixian,et al. UV Nonlinear Optical Crystal Ba2[B6O9(OH)4] Featuring Unique Chiral Layers with a New B18O42 Circle Based on BO3 and BO4 Units[J]. INORGANIC CHEMISTRY,2012,51(3):1852-1858.