| Autor: |
Li, Yuxi, Hegarty, Peter A., Rüsing, Michael, Eng, Lukas M., Ruck, Michael |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Druh dokumentu: |
Článek |
| ISSN: |
1521-3749 |
| DOI: |
10.1002/zaac.202200193 |
| Popis: |
Pure samples of colorless, air-stable Ba(BO2OH) crystals were obtained from Ba(NO3)2 and H3BO3 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)3 acts as a proton donor (Brønsted acid) rather than a hydroxide acceptor (Lewis acid). Ba(BO2OH) crystallizes in the non-centrosymmetric orthorhombic space group P212121. Hydrogen bonds connect the almost planar (BO2OH)2− anions, which are isostructural to HCO3−, 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(BO2OH) dehydrates to Ba2B2O5. Moreover, the non-centrosymmetric structure of Ba(BO2OH) crystals was verified with power-dependent confocal Second Harmonic Generation (SHG) microscopy indicating large conversion efficiencies in ambient atmosphere. |
| Databáze: |
Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
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