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The Photophysics of Dibenzo[ a,j ]phenazine
Author(s) -
Thom Kristoffer A.,
Förster Tom,
Weingart Oliver,
Goto Shimpei,
Takeda Youhei,
Minakata Satoshi,
Gilch Peter
Publication year - 2021
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.202000250
Subject(s) - intersystem crossing , phenazine , excited state , photochemistry , cyclohexane , singlet state , triplet state , chemistry , acetonitrile , spectroscopy , singlet fission , dichloromethane , solvent , phosphorescence , fluorescence , physics , atomic physics , organic chemistry , quantum mechanics
The photophysics of dibenzo[ a,j ]phenazine (DBPHZ) in solution was investigated by steady‐state and time‐resolved spectroscopy. The nature of the solvent (methanol, acetonitrile, dichloromethane and cyclohexane were considered) only weakly affects the photophysical properties. The first excited singlet state features a lifetime of the order of 1 ns. Its fluorescence emission is centered around 420 nm and occurs with moderate yields of ≈0.1. The lowest triplet state is populated with yields of ≈0.3. Quantum chemical computations suggest that a3 n π*state energetically close to the primarily excited singlet state is responsible for the efficient intersystem crossing towards the triplet manifold.