article published yes Yuxi Li author Peter A. Hegarty author Michael Rüsing author 225010000-0003-4682-4577 Lukas M. Eng author Michael Ruck author <jats:title>Abstract</jats:title><jats:p>Pure samples of colorless, air‐stable Ba(BO<jats:sub>2</jats:sub>OH) crystals were obtained from Ba(NO<jats:sub>3</jats:sub>)<jats:sub>2</jats:sub> and H<jats:sub>3</jats:sub>BO<jats:sub>3</jats:sub> under the ultra‐alkaline conditions of a KOH hydroflux at about 250 °C. The product formation depends on the water‐base molar ratio and the molar ratio of the starting materials. B(OH)<jats:sub>3</jats:sub> acts as a proton donor (Brønsted acid) rather than a hydroxide acceptor (Lewis acid). Ba(BO<jats:sub>2</jats:sub>OH) crystallizes in the non‐centrosymmetric orthorhombic space group <jats:italic>P</jats:italic>2<jats:sub>1</jats:sub>2<jats:sub>1</jats:sub>2<jats:sub>1</jats:sub>. Hydrogen bonds connect the almost planar (BO<jats:sub>2</jats:sub>OH)<jats:sup>2−</jats:sup> anions, which are isostructural to HCO<jats:sub>3</jats:sub><jats:sup>−</jats:sup>, into a syndiotactic chain. IR and Raman spectroscopy confirm the presence of hydroxide groups, which are involved in weak hydrogen bonds. Upon heating in air to about 450 °C, Ba(BO<jats:sub>2</jats:sub>OH) dehydrates to Ba<jats:sub>2</jats:sub>B<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>. Moreover, the non‐centrosymmetric structure of Ba(BO<jats:sub>2</jats:sub>OH) crystals was verified with power‐dependent confocal Second Harmonic Generation (SHG) microscopy indicating large conversion efficiencies in ambient atmosphere.</jats:p> Wiley2022 eng Inorganic Chemistry 0044-2313 1521-374910.1002/zaac.202200193 64821 yes Li, Yuxi, et al. “Ba(BO2OH) – A Monoprotonated Monoborate from Hydroflux Showing Intense Second Harmonic Generation.” <i>Zeitschrift Für Anorganische Und Allgemeine Chemie</i>, vol. 648, no. 21, e2022001, Wiley, 2022, doi:<a href="https://doi.org/10.1002/zaac.202200193">10.1002/zaac.202200193</a>. Y. Li, P.A. Hegarty, M. Rüsing, L.M. Eng, M. Ruck, Zeitschrift Für Anorganische Und Allgemeine Chemie 648 (2022). @article{Li_Hegarty_Rüsing_Eng_Ruck_2022, title={Ba(BO2OH) – A Monoprotonated Monoborate from Hydroflux Showing Intense Second Harmonic Generation}, volume={648}, DOI={<a href="https://doi.org/10.1002/zaac.202200193">10.1002/zaac.202200193</a>}, number={21e2022001}, journal={Zeitschrift für anorganische und allgemeine Chemie}, publisher={Wiley}, author={Li, Yuxi and Hegarty, Peter A. and Rüsing, Michael and Eng, Lukas M. and Ruck, Michael}, year={2022} } Li, Y., Hegarty, P. A., Rüsing, M., Eng, L. M., &#38; Ruck, M. (2022). Ba(BO2OH) – A Monoprotonated Monoborate from Hydroflux Showing Intense Second Harmonic Generation. <i>Zeitschrift Für Anorganische Und Allgemeine Chemie</i>, <i>648</i>(21), Article e2022001. <a href="https://doi.org/10.1002/zaac.202200193">https://doi.org/10.1002/zaac.202200193</a> Li Y, Hegarty PA, Rüsing M, Eng LM, Ruck M. Ba(BO2OH) – A Monoprotonated Monoborate from Hydroflux Showing Intense Second Harmonic Generation. <i>Zeitschrift für anorganische und allgemeine Chemie</i>. 2022;648(21). doi:<a href="https://doi.org/10.1002/zaac.202200193">10.1002/zaac.202200193</a> Li, Yuxi, Peter A. Hegarty, Michael Rüsing, Lukas M. Eng, and Michael Ruck. “Ba(BO2OH) – A Monoprotonated Monoborate from Hydroflux Showing Intense Second Harmonic Generation.” <i>Zeitschrift Für Anorganische Und Allgemeine Chemie</i> 648, no. 21 (2022). <a href="https://doi.org/10.1002/zaac.202200193">https://doi.org/10.1002/zaac.202200193</a>. Y. Li, P. A. Hegarty, M. Rüsing, L. M. Eng, and M. Ruck, “Ba(BO2OH) – A Monoprotonated Monoborate from Hydroflux Showing Intense Second Harmonic Generation,” <i>Zeitschrift für anorganische und allgemeine Chemie</i>, vol. 648, no. 21, Art. no. e2022001, 2022, doi: <a href="https://doi.org/10.1002/zaac.202200193">10.1002/zaac.202200193</a>. 479872023-10-11T08:56:26Z2023-10-11T08:59:51Z