New aspect of photophysics of 7,7,8,8-tetracyanoquinodimethane and its solvated complexes: intra- vs. inter-molecular charge-transfer.

ABSTRACT: We performed laser-induced fluorescence (LIF) spectroscopy of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and its solvated complexes with acetonitrile (ACN) and benzene (Bz), under the jet-cooled gas-phase condition. We also carried out fluorescence and its time profile measurements in TCNQ/Bz/hexane solution to compare with the gas-phase results. The LIF excitation spectrum of the S₁ (ππ*)-S₀ electronic transition of TCNQ monomer exhibited unusual vibronic structure with the maximum intensity at ∼3000 cm^-1 above the band origin. In addition, the fluorescence lifetime is more than 100 times longer than that in hexane solution with most of the bands showing double exponential decay. The unusual feature of the vibronic bands is intrinsic and not due to the presen

SUBMITTER: Muramatsu S 

PROVIDER: S-EPMC9034218 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature