Spectral modulation of a charge transfer reaction of 2-methoxy-4-(N,N-dimethylamino)benzaldehyde inside cyclodextrin nanocage

Preferential Molecular Encapsulation of an ICT Fluorescence Probe in the Supramolecular Cage of Cucurbit[7]uril and β-Cyclodextrin: An Experimental and Theoretical Approach

“…Hence, the possibility of nonradiative decay reduces to a greater extent as the guest molecules are less exposed to water due to encapsulation inside the hydrophobic micropockets of CB7 and β-CD. Decrease of polarity near the vicinity of the probe inside the cavity results in an increase in energy gap between the CT state and the triplet/ground states, thereby leading to a reduction in the nonradiative decay, and hence, CT emission is enhanced in the presence of these macrocyclic hosts . This decrease in polarity also results in an increase in the energy barrier for transition between the LE state and the ICT state, thereby enhancing the LE intensity .…”

“…Decrease of polarity near the vicinity of the probe inside the cavity results in an increase in energy gap between the CT state and the triplet/ ground states, thereby leading to a reduction in the nonradiative decay, and hence, CT emission is enhanced in the presence of these macrocyclic hosts. 43 This decrease in polarity also results in an increase in the energy barrier for transition between the LE state and the ICT state, thereby enhancing the LE intensity. 44 The main nonradiative channel of the local emission, via the ICT pathway, is restricted inside the nanocavity, which also causes an enhancement of the intensity of the LE band.…”