RT Journal Article
T1 Blue Emitting Star-Shaped and Octasilsesquioxane-Based Polyanions Bearing Boron Clusters. Photophysical and Thermal Properties
A1 Cabrera González, Justo Enrique
A1 Chaari, Mahdi
A1 Teixidor, Francesc
A1 Viñas, Clara
A1 Núñez, Rosario
AB 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.
PB MDPI
SN 1420-3049
YR 2020
FD 2020-03-07
LK https://hdl.handle.net/20.500.14352/8244
UL https://hdl.handle.net/20.500.14352/8244
LA eng
NO Ministerio de Economía y Competitividad (MINECO)
NO Generalitat de Catalunya
DS Docta Complutense
RD 17 abr 2025