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Open AccessArticle

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

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus U.A.B., 08193 Bellaterra, Barcelona, Spain
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Author to whom correspondence should be addressed.
Dedicated to Professor Bohumil Štibr (1940-2020), who unfortunately passed away before he could reach the age of 80, in the recognition of his outstanding contributions to boron chemistry. F.T. and C.V. express their sincere condolences on the loss of a great friend.
Academic Editors: Igor B. Sivaev, Narayan S. Hosmane and Bohumír Grüner
Molecules 2020, 25(5), 1210; https://doi.org/10.3390/molecules25051210
Received: 19 February 2020 / Revised: 5 March 2020 / Accepted: 5 March 2020 / Published: 7 March 2020
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. View Full-Text
Keywords: boron clusters; boranes; metallacarboranes; triphenylbenzene; octasilsesquioxanes; luminescence boron clusters; boranes; metallacarboranes; triphenylbenzene; octasilsesquioxanes; luminescence
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Cabrera-González, J.; Chaari, M.; Teixidor, F.; Viñas, C.; Núñez, R. Blue Emitting Star-Shaped and Octasilsesquioxane-Based Polyanions Bearing Boron Clusters. Photophysical and Thermal Properties. Molecules 2020, 25, 1210.

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