Abstract
The effect of cyclodextrin inclusion complex formation on the intramolecular charge transfer (ICT) of the included 4-N,N-dimethylamino-2-strylquinoline (2-StQ-NMe2) has been studied in detail. 2-StQ-NMe2 in presence of α-, β-, γ- and HP-α- and Hp-β-CDs predominantly exhibits ICT fluorescence predominantly than the emission from locally excited state, whereas in presence of HP-γ-CD the later is observed. In presence of α-CD, 2:1 complexation of the 2-StQ-NMe2 is observed in addition to 1:1 complexation. The observed results are explained by the CD cavity size and an active role for the secondary hydroxyl groups present in the wider rim of the CD cavity and also which finds support from absorption, emission, lifetime and molecular modeling studies.
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