Ba(BO2OH) – A Monoprotonated Monoborate from Hydroflux Showing Intense Second Harmonic Generation
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
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.
Details
Original language | English |
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Article number | e202200193 |
Journal | Zeitschrift fur Anorganische und Allgemeine Chemie |
Volume | 648 |
Issue number | 21 |
Publication status | Published - 15 Nov 2022 |
Peer-reviewed | Yes |
External IDs
ORCID | /0000-0002-2391-6025/work/142250233 |
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ORCID | /0000-0002-2484-4158/work/142257561 |
Keywords
ASJC Scopus subject areas
Keywords
- borates, crystal structure, hydroflux, pseudosymmetry, SHG effect