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First Direct Observation of the Higher Triplet Excited States of Substituted Oligothiophenes by Two‐Color Two‐Laser Flash Photolysis
Author(s) -
Fujitsuka Mamoru,
Oseki Yosuke,
Hara Michihiro,
Cai Xichen,
Sugimoto Akira,
Majima Tetsuro
Publication year - 2004
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200400169
Subject(s) - flash photolysis , picosecond , pentamer , trimer , excited state , chemistry , tetramer , photochemistry , flash (photography) , laser , photodissociation , dimer , optics , kinetics , reaction rate constant , atomic physics , organic chemistry , physics , biochemistry , quantum mechanics , enzyme
The higher triplet excited states (T n ) of oligothiophenes [trimer (3T), tetramer (4T), and pentamer (5T)] were directly observed for the first time during two‐color two‐laser flash photolysis employing a picosecond laser. The lifetimes of the T n states of the oligomers were a few tens of picoseconds. The internal conversion between T 2 –T 1 is the rate‐determining step for the oligothiophenes (see picture).