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Diffuse reflectance studies of β-phenylpropiophenone and benzophenone inclusion complexes with calix[4], [6] and [8]arenes

2001-12-05Journal article Restricted access
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dc.contributor.authorFerreira, Luís F. Vieira
dc.contributor.authorFerreira, Margarida R. Vieira
dc.contributor.authorOliveira, Anabela S.
dc.contributor.authorBranco, T. J. F.
dc.contributor.authorPrata, José V.
dc.contributor.authorMoreira, J. C.
dc.date.accessioned2020-06-09T17:54:32Z
dc.date.available2020-06-09T17:54:32Z
dc.date.issued2001-12-05
dc.description.abstractThe formation of inclusion complexes of β-phenylpropiophenone and benzophenone with p-tert-butylcalix[4], [6] and [8]arenes (powdered solid samples) was studied with the use of diffuse reflectance techniques. Experimental evidence was obtained for inclusion in all cases. The benzophenone n → π* absorption band exhibits hypsochromic shifts with an increase of the calixarene ring aperture, providing evidence for an increase in cavity polarity. β-Phenylpropiophenone exhibits strong room temperature phosphorescence in contrast to its solution behaviour, and this is a clear evidence for the inclusion of this probe within the calixarene molecules. Calix[4]arene and calix[8]arene provide a more rigid environment to β-phenylpropiophenone whereas calix[6]arene appears to be more flexible. Transient absorption spectra of inclusion complexes with benzophenone (1 : 1 mol : mol, excited at 355 nm) show major triplet formation in the calix[4]arene case, while the ketyl radical of benzophenone is formed in the calix[6]arene case and is predominant in the calix[8]arene case. Phenoxyl radical transient absorption also becomes evident in the last two cases. For β-phenylpropiophenone (1 : 1 mol : mol) phenoxyl radicals are formed but no evidence was found for triplet or ketyl radical formation of this ketone in the calix[4]arene case. However, strong support for the ketyl radical of the aryl alkyl ketone was found for calix[6]arene and calix[8]arene inclusion complexes.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFERREIRA, Luís F. Vieira; [et al] – Diffuse reflectance studies of β-phenylpropiophenone and benzophenone inclusion complexes with calix[4], [6] and [8]arenes. Physical Chemistry Chemical Physics. ISSN 1463-9076. Vol. 4, N.º 2 (2002), pp. 204-210pt_PT
dc.identifier.doi10.1039/b106760ppt_PT
dc.identifier.issn1463-9076
dc.identifier.urihttp://hdl.handle.net/10400.21/11814
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherRoyal Society of Chemistrypt_PT
dc.relation.publisherversionhttps://pubs.rsc.org/en/content/articlepdf/2002/cp/b106760ppt_PT
dc.subjectβ-phenylpropiophenonept_PT
dc.subjectBenzophenonept_PT
dc.subjectInclusionpt_PT
dc.subjectCalixarenept_PT
dc.titleDiffuse reflectance studies of β-phenylpropiophenone and benzophenone inclusion complexes with calix[4], [6] and [8]arenespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage210pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage204pt_PT
oaire.citation.titlePhysical Chemistry Chemical Physicspt_PT
oaire.citation.volume4pt_PT
person.familyNamePrata
person.givenNameJosé Virgílio
person.identifier191765
person.identifier.ciencia-idC11A-9130-8981
person.identifier.orcid0000-0002-9068-2847
person.identifier.ridB-7214-2008
person.identifier.scopus-author-id9276778400
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication15e229f3-a619-4931-87eb-799091dc1601
relation.isAuthorOfPublication.latestForDiscovery15e229f3-a619-4931-87eb-799091dc1601

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