Pure Boric Acid Does Not Show Room-Temperature Phosphorescence (RTP)
Please always quote using this URN: urn:nbn:de:bvb:20-opus-318308
- Boric acid (BA) has been used as a transparent glass matrix for optical materials for over 100 years. However, recently, apparent room-temperature phosphorescence (RTP) from BA (crystalline and powder states) was reported (Zheng et al., Angew. Chem. Int. Ed. 2021, 60, 9500) when irradiated at 280 nm under ambient conditions. We suspected that RTP from their BA sample was induced by an unidentified impurity. Our experimental results show that pure BA synthesized from B(OMe)\(_{3}\) does not luminesce in the solid state when irradiated atBoric acid (BA) has been used as a transparent glass matrix for optical materials for over 100 years. However, recently, apparent room-temperature phosphorescence (RTP) from BA (crystalline and powder states) was reported (Zheng et al., Angew. Chem. Int. Ed. 2021, 60, 9500) when irradiated at 280 nm under ambient conditions. We suspected that RTP from their BA sample was induced by an unidentified impurity. Our experimental results show that pure BA synthesized from B(OMe)\(_{3}\) does not luminesce in the solid state when irradiated at 250–400 nm, while commercial BA indeed (faintly) luminesces. Our theoretical calculations show that neither individual BA molecules nor aggregates would absorb light at >175 nm, and we observe no absorption of solid pure BA experimentally at >200 nm. Therefore, it is not possible for pure BA to be excited at >250 nm even in the solid state. Thus, pure BA does not display RTP, whereas trace impurities can induce RTP.…
Author: | Zhu Wu, Juan Carlos Roldao, Florian Rauch, Alexandra Friedrich, Matthias Ferger, Frank WürthnerORCiDGND, Johannes Gierschner, Todd B. Marder |
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URN: | urn:nbn:de:bvb:20-opus-318308 |
Document Type: | Journal article |
Faculties: | Fakultät für Chemie und Pharmazie / Institut für Anorganische Chemie |
Fakultät für Chemie und Pharmazie / Institut für Organische Chemie | |
Language: | English |
Parent Title (English): | Angewandte Chemie |
Year of Completion: | 2022 |
Volume: | 61 |
Issue: | 15 |
Article Number: | e202200599 |
Source: | Angewandte Chemie 2022, 61(15):e202200599. DOI: 10.1002/anie.202200599 |
DOI: | https://doi.org/10.1002/anie.202200599 |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 546 Anorganische Chemie |
Tag: | boric acid; optical materials; room-temperature phosphorescence (RTP) |
Release Date: | 2023/07/04 |
Licence (German): | CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |