Abstract
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.
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