logo icmab ochoa 02 01 logo icmab ochoa 02 01
  • NEWS

Fluorescent carborane–vinylstilbene functionalised octasilsesquioxanes: synthesis, structural, thermal and photophysical properties

A 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.




See more posts on ICMAB related to: Materials for energy and enviroment

Related Topics: Materials for energy and enviroment

Also on ICMAB...

  • Three ICMAB researchers promoted to Research Scientists

    30 October 2017 447 hit(s)

    Gerard Tobias, Mariano Campoy-Quiles and Rosario Núñez have been successfully promoted to Research Scientists through a selective process by internal promotion, after a competitive test within the CSIC centers in the area of "Materials Science and Technology".
  • A manuscript from Prof. Clara Viñas highlighted in ChemistryViews

    11 August 2017 628 hit(s)

    One manuscript from Prof. Clara Viñas and her team has been chosen to be highlighted on the ChemistryViews website. The manuscript chosen is "Small-Molecule Kinase-Inhibitors-Loaded Boron Cluster as Hybrid Agents for Glioma-Cell-Targeting Therapy", published in Chemistry-A European Journal, and already qualified as Hot Paper and Frontispiece of the journal.
  • Francesc Teixidor, Invited Professor at the 2017 Boron-Chemistry Micro-Forum held in Nanjing University

    27 July 2017 747 hit(s)

    In the morning of July 17, the 2017 Boron-Chemistry Micro-Forum started in the School of Chemistry and Chemical Engineering, at Nanjing University (China). Prof. Francesc Teixidor from the Institute of Materials Science of Barcelona (ICMAB) was Invited Professor at this micro-forum, which was divided into two sections: one dedicated to Research Progress reports, and the other one to Academic Lectures.