Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/91076
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Pinheiro, Daniela | - |
dc.contributor.author | Piñeiro, Marta | - |
dc.contributor.author | Pina, João | - |
dc.contributor.author | Brandão, Pedro | - |
dc.contributor.author | Galvão, Adelino M. | - |
dc.contributor.author | Melo, J. Sérgio Seixas de | - |
dc.date.accessioned | 2020-09-21T12:44:59Z | - |
dc.date.available | 2020-09-21T12:44:59Z | - |
dc.date.issued | 2020-04 | - |
dc.identifier.issn | 01437208 | pt |
dc.identifier.uri | https://hdl.handle.net/10316/91076 | - |
dc.description.abstract | The microwave-assisted synthesis of tryptanthrin from indigo in mild oxidation conditions, and a comprehensive study of the excited state properties of this compound in a variety of solvents with different polarity and viscosity values at room and low temperatures are reported. In contrast with indigo, emission of the triplet state of tryptanthrin is observed with a very efficient singlet oxygen sensitization quantum yield, indicating that the triplet state is efficiently populated. From time-resolved fluorescence and femtosecond transient absorption data, further supported with time-dependent density functional theory (TDDFT) calculations, two species, with S1 states with locally excited (LE) of π,π* nature and a charge transfer (CT) of n,π* characteristics, originated from an initially populated Frank-Condon S2 state (π,π*), are observed. The two electronically independent species are energetically nearly degenerate and inter-conversion is predicted (and rate constants determined) to occur between LE (S1) and CT (S1) species. Due to the low value of the fluorescence quantum yield (~10−3) and high triplet state yield (ϕT≥ϕΔ), the high stability of this compound is associated to the high efficiency of the radiationless deactivation processes which involve the formation of the CT state which efficiently converts, through S1 ~~> Tn intersystem crossing, to the T1 triplet state. | pt |
dc.language.iso | eng | pt |
dc.publisher | Elsevier | pt |
dc.relation | info:eu-repo/grantAgreement/RCUK/Innovate UK/103252/GB/HYLIGHT – HYbrid LIquefied petroleum Gas tanker witH magspliT | pt |
dc.relation | info:eu-repo/grantAgreement/UID/QUI/00313/2019 | pt |
dc.relation | info:eu-repo/grantAgreement/POCI-01-0145-FEDER-016387/SunStorage - Harvesting and storage of solar energy | pt |
dc.relation | info:eu-repo/grantAgreement/UID/QUI/00100/2019 | pt |
dc.relation | info:eu-repo/grantAgreement/SFRH/BD/74351/2010 | pt |
dc.relation | info:eu-repo/grantAgreement/PD/BD/128490/2017 | pt |
dc.rights | embargoedAccess | pt |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | pt |
dc.subject | Indigo | pt |
dc.subject | Tryptanthrin | pt |
dc.subject | Fluorescence | pt |
dc.subject | Singlet oxygen sensitization | pt |
dc.subject | TDDFT | pt |
dc.title | Tryptanthrin from indigo: Synthesis, excited state deactivation routes and efficient singlet oxygen sensitization | pt |
dc.type | article | - |
degois.publication.issue | 108125 | pt |
degois.publication.title | Dyes and Pigments | pt |
dc.relation.publisherversion | https://www.sciencedirect.com/science/article/pii/S0143720819320327 | pt |
dc.peerreviewed | yes | pt |
dc.identifier.doi | 10.1016/j.dyepig.2019.108125 | pt |
degois.publication.volume | 175 | pt |
dc.date.embargo | 2022-04-01 | * |
uc.date.periodoEmbargo | 730 | pt |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | Com Texto completo | - |
item.languageiso639-1 | en | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.orcid | 0000-0001-5897-6020 | - |
crisitem.author.orcid | 0000-0002-7460-3758 | - |
crisitem.author.orcid | 0000-0003-1848-1167 | - |
crisitem.author.orcid | 0000-0002-1455-7470 | - |
crisitem.author.orcid | 0000-0001-9708-5079 | - |
Appears in Collections: | I&D CQC - Artigos em Revistas Internacionais |
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File | Description | Size | Format | |
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DP_2020.pdf | 1.07 MB | Adobe PDF | View/Open |
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