Blue Emitting Star-Shaped and Octasilsesquioxane-Based Polyanions Bearing Boron Clusters. Photophysical and Thermal Properties

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Cabrera González, Justo Enrique and Chaari, Mahdi and Teixidor, Francesc and Viñas, Clara and Núñez, Rosario (2020) Blue Emitting Star-Shaped and Octasilsesquioxane-Based Polyanions Bearing Boron Clusters. Photophysical and Thermal Properties. Molecules, 25 (5). p. 1210. ISSN 1420-3049

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Official URL: https://doi.org/10.3390/molecules25051210




Abstract

High boron content systems were prepared by the peripheral functionalisation of 1,3,5-triphenylbenzene (TPB) and octavinylsilsesquioxane (OVS) with two different anionic boron clusters: closo-dodecaborate (B12) and cobaltabisdicarbollide (COSAN). TPB was successfully decorated with three cluster units by an oxonium ring-opening reaction, while OVS was bonded to eight clusters by catalysed metathesis cross-coupling. The resulting compounds were spectroscopically characterised, and their solution-state photophysical properties analysed. For TPB, the presence of COSAN dramatically quenches the fluorescence emission (λem = 369 nm; ΦF = 0.8%), while B12-substituted TPB shows an appreciable emission efficiency (λem = 394 nm; ΦF = 12.8%). For octasilsesquioxanes, the presence of either COSAN or B12 seems to be responsible for ∼80 nm bathochromic shift with respect to the core emission, but both cases show low emission fluorescence (ΦF = 1.4–1.8%). In addition, a remarkable improvement of the thermal stability of OVS was observed after its functionalisation with these boron clusters.


Item Type:Article
Uncontrolled Keywords:boron clusters; boranes; metallacarboranes; triphenylbenzene; octasilsesquioxanes; luminescence
Subjects:Sciences > Chemistry > Chemistry, Organic
ID Code:66262
Deposited On:21 Jun 2021 10:51
Last Modified:21 Jun 2021 10:54

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