Abstract
Intramolecular charge transfer (ICT) of confined 1-tert-butyl-6-cyano-1, 2, 3, 4-tetrahydroquinoline (NTC6) is determined with a single time constant of ~1 ps regardless of solvents, although ICT of 4-(dimethylamino)benzonitrile (DMABN) shows dispersive dynamics in solvents.
Highlights
Intramolecular charge transfer (ICT) of confined 1-tert-butyl-6-cyano-1, 2, 3, 4-tetrahydroquinoline (NTC6) is determined with a single time constant of ~1 ps regardless of solvents, ICT of 4-(dimethylamino)benzonitrile (DMABN) shows dispersive dynamics in solvents
Our recent time-resolved fluorescence (TRF) and timeresolved fluorescence spectra (TRFS) of DMABN proposed a multi-faceted ICT process controlled in part by the conformational distribution of the ground state [6]. 1-tert-butyl-6-cyano-1, 2, 3, 4-tetrahydroquinoline (NTC6), a planarized analogue of DMABN, shows dual fluorescence and it has been considered to be an important evidence for the planar ICT (PICT) model [3]
Gómez et al showed that the PICT concept cannot be excluded in the ICT reaction [7], a recent work by Hättig et al indicated that the ICT reaction of the planarized NTC6 proceeds along the twisting coordinate because of the flexibility of the amino group to some extent [8]
Summary
Intramolecular charge transfer (ICT) of confined 1-tert-butyl-6-cyano-1, 2, 3, 4-tetrahydroquinoline (NTC6) is determined with a single time constant of ~1 ps regardless of solvents, ICT of 4-(dimethylamino)benzonitrile (DMABN) shows dispersive dynamics in solvents. Since Lippert’s work [1], several models have been proposed such as twisted ICT (TICT) [2] and planar ICT (PICT) [3]. The TICT model, where fully twist of the dimethylamino group is required to undergo the ICT reaction, was widely accepted.
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