Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/17880
DC Field | Value | Language |
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dc.contributor.author | Lapinski, Leszek | - |
dc.contributor.author | Rostkowska, Hanna | - |
dc.contributor.author | Khvorostov, Artem | - |
dc.contributor.author | Yaman, Müjgan | - |
dc.contributor.author | Fausto, Rui | - |
dc.contributor.author | Nowak, Maciej J. | - |
dc.date.accessioned | 2011-12-13T11:55:57Z | - |
dc.date.available | 2011-12-13T11:55:57Z | - |
dc.date.issued | 2004-05 | - |
dc.identifier.uri | https://hdl.handle.net/10316/17880 | - |
dc.description.abstract | Dithiooxamide [rubeanic acid, NH2C(S)C(S)NH2)] monomers were studied by FTIR spectroscopy combined with the low-temperature matrix-isolation technique. The most stable dithione−diamino tautomer of the compound was exclusively observed in argon matrixes immediately after deposition. Upon UV (λ > 345 nm) irradiation the dithione−diamino form transformed, by a double-proton transfer, into the dithiol−diimino tautomer. Theoretically supported analysis of the infrared spectrum emerging upon UV irradiation allowed identification of one of the conformers of the dithiol−diimino tautomer as the dominating photoproduct. Smaller quantities of other conformers of the dithiol−diimino tautomer were also found to be photogenerated. For the UV-irradiated matrix kept subsequently at 10 K and in darkness, a dithiol−diimino → dithione−diamino tautomerization leading to partial recovery of the initial form of the compound was observed. The only possible mechanism of this ground-state transformation at cryogenic temperature is synchronous double-proton tunneling. The experimentally obtained time constant of this process was 18 h. | por |
dc.language.iso | eng | por |
dc.publisher | American Chemical Society | por |
dc.rights | openAccess | por |
dc.title | Double-Proton-Transfer Processes in Dithiooxamide: UV-Induced Dithione → Dithiol Reaction and Ground-State Dithiol → Dithione Tunneling | por |
dc.type | article | por |
degois.publication.firstPage | 5551 | por |
degois.publication.lastPage | 5558 | por |
degois.publication.title | J. Phys. Chem. A | por |
dc.peerreviewed | Yes | por |
dc.identifier.doi | 10.1021/jp049263w | - |
degois.publication.volume | 108 | por |
uc.controloAutoridade | Sim | - |
item.grantfulltext | open | - |
item.fulltext | Com Texto completo | - |
item.openairetype | article | - |
item.languageiso639-1 | en | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.cerifentitytype | Publications | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.orcid | 0000-0003-2896-4007 | - |
crisitem.author.orcid | 0000-0002-8264-6854 | - |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
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J.Physical Chemistry A, 108 (2004) 5551.pdf | 184.61 kB | Adobe PDF | View/Open |
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