Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 38-39, Pages 4575-4580Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201700453
Keywords
Boron clusters; Carboranes; Luminescence; Stilbene; Density functional calculations
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Funding
- Spanish Ministerio de Economia y Competitividad, MINECO [CTQ2013-44670-R]
- Severo Ochoa Program for Centers of Excellence in RD [SEV-2015-0496]
- Generalitat de Catalunya [2014/SGR/149]
- MINECO [CTQ2014-58801]
- Campus of International Excellence (CEI) UAM+CSIC
- PAIP
- PAPIIT (UNAM) [IN216616]
- CONACyT
- CSIC
- EC through the CO-FUND program AMAROUT
- Severo Ochoa program for Centers of Excellence in RD (MINECO) [SEV-2016-0686]
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The synthesis and spectroscopic characterization of the first set of tetrakis{[(p-dodecacarboranyl)methyl]stilbenyl}ethylenes (TDSE), substituted either with a methyl or a phenyl group in the 2-position (C-cluster) of the ortho-carborane, are described. The complex absorption properties are elucidated by TD-DFT calculations, stressing the importance of through-bond conjugation. Enhanced conjugation and restriction of the conformational space are identified as the main factors for boosted luminescence properties in solution, compared with the tetraphenylethylene (TPE) core, effectively reducing internal conversion (IC). IC is further reduced when aggregate suspensions of our compounds are formed in water, providing highly luminescent materials of quasi-isolated (very weakly interacting) emitters.
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