Excited-state relaxation processes of three newly synthesized multi-branched alkyl-triphenylamine end-capped triazines
Abstract
The excited-state relaxation processes of three newly synthesized multi-branched alkyl-triphenylamine end-capped triazines ATT-(1-3) are characterized in different solvents by steady-state and time-resolved spectroscopy. In toluene, a weakly polar solvent, the emission originates from the intramolecular charge transfer (ICT) state; in tetrahydrofuran (THF), a strongly polar solvent, the existence of a nonradiative channel from ICT to twisted intramolecular charge transfer (TICT) accelerates the relaxation rate of the ICT state. The rate of the evolution process of ATT-(1-3) increases with increasing number of donor branches, which could ascribed to enhancements in the electron donor and acceptor abilities of the triazines.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- December 2019
- DOI:
- 10.1016/j.cplett.2019.136800
- Bibcode:
- 2019CPL...73636800L
- Keywords:
-
- Intramolecular charge transfer (ICT);
- Fluorescence dynamic;
- Multi-branched structure;
- Solvent effect