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Fluorescent calix[4]arene-carbazole-containing polymers as sensors for nitroaromatic explosives

2020-12-10Journal article Open access
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dc.contributor.authorBarata, Patrícia
dc.contributor.authorPrata, José Virgílio
dc.date.accessioned2021-01-11T15:19:10Z
dc.date.available2021-01-11T15:19:10Z
dc.date.issued2020-12-10
dc.description.abstractTwo highly fluorescent calix[4]arene-containing phenylene-alt-ethynylene-carbazolylene polymers (Calix-PPE-CBZs) were used in the detection of explosives from the nitroaromatic compounds (NACs) family, in solution and in vapour phases. Both fluorophores exhibit high sensitivity and selectivity towards NACs detection. The quenching efficiencies in solution, assessed through static Stern-Volmer constants (K-SV), follow the order picric acid (PA) >> 2,4,6-trinitrotoluene (TNT) > 2,4-dinitrotoluene > (2,4-DNT) > nitrobenzene (NB). These correlate very well with the NACs electron affinities, as evaluated from their lowest unoccupied molecular orbitals (LUMOs) energies, indicating a photo-induced electron transfer as the dominant mechanism in fluorescence quenching. Moreover, and most interesting, detection of TNT, 2,4-DNT and NB vapours via thin-films of Calix-PPE-CBZs revealed a remarkably sensitive response to these analytes, comparable to state-of-the-art chemosensors. The study also analyses and compares the current results to previous disclosed data on the detection of NACs by several calix[4]arene-based conjugated polymers and non-polymeric calix[4]arenes-carbazole conjugates, overall highlighting the superior role of calixarene and carbazole structural motifs in NACs' detection performance. Density functional theory (DFT) calculations performed on polymer models were used to support some of the experimental findings.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBARATA, Patrícia D.; PRATA, José V. – Fluorescent calix[4]arene-carbazole-containing polymers as sensors for nitroaromatic explosives. Chemosensors. ISSN 2227-9040. Vol. 8, N.º 4 (2020), pp. 1-15pt_PT
dc.identifier.doi10.3390/chemosensors8040128pt_PT
dc.identifier.issn2227-9040
dc.identifier.urihttp://hdl.handle.net/10400.21/12599
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationUIDB/00616/2020 - FCT/MCTESpt_PT
dc.relationUIDP/00616/2020 - FCT/MCTESpt_PT
dc.subjectCalix[4]arenept_PT
dc.subjectConjugated polymerpt_PT
dc.subjectCarbazolept_PT
dc.subjectFluorescencept_PT
dc.subjectSensorpt_PT
dc.subjectExplosivespt_PT
dc.titleFluorescent calix[4]arene-carbazole-containing polymers as sensors for nitroaromatic explosivespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage15pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleChemosensorspt_PT
oaire.citation.volume8pt_PT
person.familyNameBarata
person.familyNamePrata
person.givenNamePatrícia
person.givenNameJosé Virgílio
person.identifier1090399
person.identifier191765
person.identifier.ciencia-idC019-9F30-0F99
person.identifier.ciencia-idC11A-9130-8981
person.identifier.orcid0000-0001-8274-633X
person.identifier.orcid0000-0002-9068-2847
person.identifier.ridB-7214-2008
person.identifier.scopus-author-id8968446000
person.identifier.scopus-author-id9276778400
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication4ab8a01f-c11d-4b3b-b0cf-b21e5b634170
relation.isAuthorOfPublication15e229f3-a619-4931-87eb-799091dc1601
relation.isAuthorOfPublication.latestForDiscovery15e229f3-a619-4931-87eb-799091dc1601

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