Abstract
Absorption and steady-state and time-resolved emission studies of p- N, N-dimethylaminobenzaldehyde (DMABA) in aqueous α-cyclodextrin (αCD) solutions are reported. The twisted intramolecular charge transfer (TICT) emission is extremely poor in pure water, but is greatly enhanced upon complexation with αCD. The cavity size of αCD is insufficient to encapsulate the entire fluorophore; rather it embeds DMABA only partially, keeping the dimethylamino group open in bulk water. The enhancement in the TICT emission is attributed to the reduced polarity provided by the CD environment.
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