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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2024-11-01
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| author | Hanna Rostkowska Maciej J. Nowak Igor Reva Leszek Lapinski |
| author_facet | Hanna Rostkowska Maciej J. Nowak Igor Reva Leszek Lapinski |
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| description | 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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| institution | Kabale University |
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| publishDate | 2024-11-01 |
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| spelling | doaj-art-9e89ca54f1204b2287d070570411423c2024-11-26T18:16:09ZengMDPI AGMolecules1420-30492024-11-012922547210.3390/molecules29225472Photochemical Hydroxyl Group Abstraction from <i>N</i>-Hydroxypyridine-2(1<i>H</i>)-thione Isolated in a Solid Hydrogen Matrix: Photogeneration of 2-MercaptopyridineHanna Rostkowska0Maciej J. Nowak1Igor Reva2Leszek Lapinski3Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, PolandInstitute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, PolandDepartment of Chemical Engineering, CERES, University of Coimbra, 3030-790 Coimbra, PortugalInstitute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, PolandMonomers 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>.https://www.mdpi.com/1420-3049/29/22/5472photochemistryIR spectrahydroxyl radical2-mercaptopyridine-<i>N</i>-oxidecage effectreactive matrix |
| spellingShingle | Hanna Rostkowska Maciej J. Nowak Igor Reva Leszek Lapinski 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 Molecules photochemistry IR spectra hydroxyl radical 2-mercaptopyridine-<i>N</i>-oxide cage effect reactive matrix |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | photochemistry IR spectra hydroxyl radical 2-mercaptopyridine-<i>N</i>-oxide cage effect reactive matrix |
| url | https://www.mdpi.com/1420-3049/29/22/5472 |
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