Fluorescence of Radical Ions in Liquid Solution: Wurster's Blue as a Case Study
Journal article published in 2011 by
Jakob Grilj,
Elena N. Laricheva,
Massimo Olivucci 
,
Eric Vauthey
,
Eric Vauthey
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Abstract
The fluorescence lifetime of the radical cation of N,N,N′,N′- tetramethyl-p-phenylenediamine (Wurster's blue) decreases from 260 ps at 82 K to 200 fs at room temperature. Calculations indicate a small barrier between the excited-state minimum (D 1 min) and a conical intersection (CI) of the excited and ground state potentials. The intersection is reached within 200 fs upon torsion of one of the C-N bonds.