Specific hydrogen bonding interaction versus the “free volume” model for TICT molecules in polymeric matrices

The absence of TICT emission in non-hydrogen-bonded polymers is confirmed. In such polymers the abnormal fluorescence F a appears when water traces are introduced at the same time as the solute. Contrary to the recent results of Al-Hassan and Azumi a very intense TICT fluorescence (long-lived) is ob...

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Published in:Chemical physics letters 1989-05, Vol.157 (5), p.393-397
Main Authors: Cazeau-Dubroca, C., Peirigua, A., Brahim, M.Ben, Nouchi, G., Cazeau, Ph
Format: Article
Language:English
Subjects:
Physics
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Summary:The absence of TICT emission in non-hydrogen-bonded polymers is confirmed. In such polymers the abnormal fluorescence F a appears when water traces are introduced at the same time as the solute. Contrary to the recent results of Al-Hassan and Azumi a very intense TICT fluorescence (long-lived) is observed for p-dimethylaminobenzonitrile (DMABN) in polyvinylalcohol (PVA). We explain this discrepancy by the quenching of the TICT fluorescence by acetic acid contained as an impurity in their PVA. The quasi-independence of the emission on molecular weight for the same kind of polymer, and the significant decrease of F a by softening the matrix, rule out the “free volume” model as being solely responsible for the TICT emission in polymeric matrices. The specific solute solvent interaction has to be retained.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(89)87269-0