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

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 S (ππ*)-S electronic transition of TCNQ monomer exhibited unusual vibronic structure with the maximum intensity at ∼3000 cm above the band origin.

Laser Spectroscopy and Lifetime Measurements of the S State of Tetracyanoquinodimethane (TCNQ) in a Cold Gas-Phase Free-Jet.

The S electronic state of 7,7,8,8-Tetracyanoquinodimethane (TCNQ) has been investigated by laser induced fluorescence (LIF), dispersed fluorescence (DF) spectroscopy, and lifetime measurements under jet-cooled conditions in the gas-phase. The LIF spectrum showed a weak origin band at 412.13 nm (24262 cm ) with prominent progression and combination bands involving vibrations of 327, 1098, and 2430 cm .