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Formation of a supramolecular charge-transfer complex. Ultrafast excited state dynamics and quantum-chemical calculations

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dc.contributor.authorVolchkov, Valery V.
dc.contributor.authorKhimich, Mikhail N.
dc.contributor.authorRusalov, Mikhail V.
dc.contributor.authorGostev, Fedor E.
dc.contributor.authorFreidzon, Alexandra Ya.
dc.contributor.authorФрейдзон, Александра Яковлевна
dc.date.accessioned2024-11-20T09:26:12Z
dc.date.available2024-11-20T09:26:12Z
dc.date.issued2019
dc.description.abstractThe formation of a supramolecular complex of bis(18-crown-6) stilbene (1) and 4,4'-bipyridine with two ammoniopropyl N-substituents (3) and the substitution reaction between 1 center dot 3 and alkali and alkaline-earth metal perchlorates have been studied using absorption, steady-state fluorescence, and femtosecond transient absorption spectroscopy. The formation of 1 center dot(Mn+)(2) complexes in acetonitrile was demonstrated. The weak long-wavelength charge-transfer absorption band of 1 center dot 3 completely vanishes upon complexation with metal cations because of disruption of the pseudocyclic structure. The spectroscopic and luminescence parameters, stability and substitution constants were calculated. The relaxation scheme of the 1 center dot 3 singlet state excited by a 25 fs laser pulse was proposed. It includes very fast vibrational relaxation and direct (tau(CT-d) = 0.32 ps) and back (tau(CT-b) = 0.51 ps) electron transfer resulting in complete fluorescence quenching. The quantum-chemistry calculations revealed the species taking part in the ET process and elucidated the mechanism of relaxation of the excited complex.
dc.format.extentС. 232-241;
dc.identifier.citationFormation of a supramolecular charge-transfer complex. Ultrafast excited state dynamics and quantum-chemical calculations / Volchkov, ValeryV [et al.] // Photochemical and Photobiological Sciences. - 2019. - 18. - № 1. - P. 232-241;. - 10.1039/c8pp00328a
dc.identifier.doi10.1039/c8pp00328a
dc.identifier.urihttps://www.doi.org/10.1039/c8pp00328a
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85058406970&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000457260400022
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/16509
dc.relation.ispartofPhotochemical and Photobiological Sciences
dc.titleFormation of a supramolecular charge-transfer complex. Ultrafast excited state dynamics and quantum-chemical calculations
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue1
oaire.citation.volume18
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relation.isAuthorOfPublication.latestForDiscovery05de5b18-263a-422f-b27e-994a5d845350
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