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Studies towards the living polymerisation of phenylethynyl-calix[4]arene compounds with rhbased ternary catalytic systems

2008-01Journal article Restricted access
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dc.contributor.authorCosta, Alexandra I.
dc.contributor.authorPrata, José V.
dc.date.accessioned2020-06-09T15:05:25Z
dc.date.available2020-06-09T15:05:25Z
dc.date.issued2008-01
dc.description.abstractThe living polymerisation of mono and difunctional phenylethynylcalix[4]arene compounds 1 and 2 by Rh(I) ternary catalytic systems (TCS) was examined. Two TCS were tentatively prepared in situ, adapting known methodologies: (1) Rh(CuCPh)(norbornadiene)(PPh3) and (2) Rh(C(Ph)CvCPh2)(norbornadiene)(PPh3). Using the first TCS, the conjugated polymers poly 1 and poly 2 could be obtained in very good yields (77–86%), in short reaction times and freed from low-molecular-weight products, only when NEt3 was used as a co-catalyst. With the second TCS, excellent results were obtained. Indeed,thiscatalyticsystemprovedtobequiteefficientin thepolymerisation ofcalix[4]arenes 1and 2, affording the correspondent poly 1 and poly 2 essentially in almost quantitative yields (by GPC analysis), under appropriate conditions. The living nature of the polymerisation has been proved. For instance, in the case of calix[4]arene 1, the Mn of the polymer obtained at high monomer conversion increased proportionally with the [1]:[Rh] molar ratio in the feed, keeping [1]o constant, thus showing that irreversible chain transfer or termination reactions did not occur to a major extent. Under the most favourable conditions {[1]:[Rh] 5 50 and [2]:[Rh] 5 50}, the polydispersities of poly 1 and poly 2 were kept in a narrow range (1.16–1.30).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCOSTA, Alexandra I.; PRATA, José V. – Studies towards the living polymerisation of phenylethynyl-calix[4]arene compounds with rhbased ternary catalytic systems. Supramolecular Chemistry. ISSN 1061-0278. Vol. 20, N.º 1-2 (2008), pp. 95-108pt_PT
dc.identifier.doi10.1080/10610270701762684pt_PT
dc.identifier.issn1061-0278
dc.identifier.issn1029-0478
dc.identifier.urihttp://hdl.handle.net/10400.21/11807
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherTaylor & Francispt_PT
dc.relation.publisherversionhttps://www.tandfonline.com/doi/pdf/10.1080/10610270701762684?needAccess=truept_PT
dc.subjectCalixarenept_PT
dc.subjectConjugated polymerspt_PT
dc.subjectLiving polymerisationpt_PT
dc.subjectRhodiumpt_PT
dc.subjectTransition metal catalystpt_PT
dc.subjectDimerisationpt_PT
dc.titleStudies towards the living polymerisation of phenylethynyl-calix[4]arene compounds with rhbased ternary catalytic systemspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage108pt_PT
oaire.citation.issue1-2pt_PT
oaire.citation.startPage95pt_PT
oaire.citation.titleSupramolecular Chemistrypt_PT
oaire.citation.volume20pt_PT
person.familyNameCosta
person.familyNamePrata
person.givenNameAlexandra
person.givenNameJosé Virgílio
person.identifier191765
person.identifier.ciencia-id4212-F7BF-D971
person.identifier.ciencia-idC11A-9130-8981
person.identifier.orcid0000-0002-5518-6506
person.identifier.orcid0000-0002-9068-2847
person.identifier.ridB-7214-2008
person.identifier.scopus-author-id8968446100
person.identifier.scopus-author-id9276778400
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication5f3891cc-260d-41d3-b803-4fd17e3734bd
relation.isAuthorOfPublication15e229f3-a619-4931-87eb-799091dc1601
relation.isAuthorOfPublication.latestForDiscovery15e229f3-a619-4931-87eb-799091dc1601

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