Photochemical Hydroxyl Group Abstraction from <i>N</i>-Hydroxypyridine-2(1<i>H</i>)-thione Isolated in a Solid Hydrogen Matrix: Photogeneration of 2-Mercaptopyridine
Monomers of <i>N</i>-hydroxypyridine-2(1<i>H</i>)-thione were isolated in low-temperature matrices of solid normal hydrogen (n-H<sub>2</sub>). The matrix-isolated compound was irradiated with UV-B (λ = 305 nm) or UV-A (λ > 360 nm) light. Upon such irradiation,...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/29/22/5472 |
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| Summary: | Monomers of <i>N</i>-hydroxypyridine-2(1<i>H</i>)-thione were isolated in low-temperature matrices of solid normal hydrogen (n-H<sub>2</sub>). The matrix-isolated compound was irradiated with UV-B (λ = 305 nm) or UV-A (λ > 360 nm) light. Upon such irradiation, the initial form of <i>N</i>-hydroxypyridine-2(1<i>H</i>)-thione was completely consumed and converted into photoproducts. 2-Mercaptopyridine and water were identified as the main products of these photochemical transformations. Identification of photoproduced 2-mercaptopyridine is unquestionable. It is based on the identity of two sets of IR bands: (i) the bands observed in the IR spectrum recorded (in a separate experiment) for monomers of 2-mercaptopyridine trapped in an n-H<sub>2</sub> matrix and (ii) a set of IR bands observed in the spectrum recorded after UV irradiation of <i>N</i>-hydroxypyridine-2(1<i>H</i>)-thione. It should be emphasized that the UV-induced processes, occurring for <i>N</i>-hydroxypyridine-2(1<i>H</i>)-thione isolated in an n-H<sub>2</sub> matrix, lead to products that are significantly different from those generated from the compound trapped in solid Ar or in solid N<sub>2</sub>. |
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| ISSN: | 1420-3049 |