Fluorescent carborane-vinylstilbene functionalised octasilsesquioxanes: Synthesis, structural, thermal and photophysical properties

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dc.contributor.authorCabrera González, Justo Enrique
dc.date.accessioned2024-01-30T10:55:19Z
dc.date.available2024-01-30T10:55:19Z
dc.date.issued2017-09-12
dc.description.abstractA new set of four different fluorescent boron-rich hybrids based on an octasilsesquioxane core (T8) are presented herein. The syntheses have been carried out starting from styrene-containing ortho- and meta-carboranes and an adequately substituted octasilsesquixane derivative (p-BrStyrenylOS) via Heck coupling reaction. The carborane clusters are attached to the T8 core through para-substituted stilbene spacers, which act as the main electronic donor of the molecule and as a result are responsible for the photoluminescence properties of the hybrids. These have been assessed in DCM solution, concluding that the presence of the carborane clusters plays a key role in the increase of the fluorescence emission displayed by the hybrids. A comparative study of different substituents (H, Me or Ph) linked to the adjacent carbon atom of the ortho-cluster revealed that the unsubstituted o-carborane derivative (POSS-H) has a much higher quantum yield in solution (ΦF = 59%) than its two counterparts. Besides, a comparison between two hybrids containing phenyl-substituted ortho- (POSS-Ph) and meta-carborane (POSS-mPh), demonstrated a significantly higher emission enhancement by the latter, backing the results we have previously reported for similar systems. In the solid state, the emission is largely quenched in all cases (ΦF = 4 to 7%) as well as bathochromically shifted due to considerable intermolecular interactions. Finally, the thermal resistances of these hybrids were tested by TGA under an inert atmosphere, unveiling weight losses as low as 15.8% and proving that the attachment of the carborane moieties to the T8 core outstandingly improves the thermal stability of the final POSS.
dc.description.departmentDepto. de Química en Ciencias Farmacéuticas
dc.description.facultyFac. de Farmacia
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (España)
dc.description.sponsorshipGeneralitat de Catalunya
dc.description.statuspub
dc.identifier.citationCabrera-González, Justo, et al. «Fluorescent Carborane–Vinylstilbene Functionalised Octasilsesquioxanes: Synthesis, Structural, Thermal and Photophysical Properties». J. Mater. Chem. C, vol. 5, n.o 39, 2017, pp. 10211-19. DOI.org (Crossref), https://doi.org/10.1039/C7TC03319B.
dc.identifier.doi10.1039/c7tc03319b
dc.identifier.essn2050-7534
dc.identifier.issn2050-7526
dc.identifier.officialurlhttps://doi.org/10.1039/c7tc03319b
dc.identifier.urihttps://hdl.handle.net/20.500.14352/96402
dc.journal.titleJournal of Materials Chemistry C
dc.language.isoeng
dc.page.final10219
dc.page.initial10211
dc.publisherRoyal Society of Chemistry
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/CTQ2016-75150-R
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/SEV-2015-0496
dc.relation.projectIDinfo:eu-repo/grantAgreement/2014/SGR/149
dc.rights.accessRightsrestricted access
dc.subject.ucmQuímica
dc.subject.unesco23 Química
dc.titleFluorescent carborane-vinylstilbene functionalised octasilsesquioxanes: Synthesis, structural, thermal and photophysical properties
dc.typejournal article
dc.type.hasVersionVoR
dc.volume.number5
dspace.entity.typePublication
relation.isAuthorOfPublication5fdca92d-6eb3-4245-bdfe-1bf73af9881b
relation.isAuthorOfPublication.latestForDiscovery5fdca92d-6eb3-4245-bdfe-1bf73af9881b
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