Structural and optical investigations of charge transfer complexes involving the radical anions of TCNQ and F(4)TCNQ
Ashley L Sutton, Brendan F Abrahams, Deanna M D'Alessandro, Timothy A Hudson, Richard Robson, Pavel M Usov
CRYSTENGCOMM | ROYAL SOC CHEMISTRY | Published : 2016
The structures and optical band gaps of twelve radical anionic 7,7,8,8-tetracyanoquinodimethane (TCNQ) and 7,7,8,8-tetracyano-2,3,4,5-tetrafluoroquinodimethane (F4TCNQ) based charge-transfer complexes are reported. The compounds described have been categorised into three general types based upon solid-state arrangements of the donor and acceptor molecules. Crystallographic, EPR and IR spectroscopic investigations indicated that both TCNQ and F4TCNQ in each of the compounds described exist in the radical monoanion form. Visible-NIR absorption measurements indicate optical band gaps in the range of 0.79 to 1.08 eV. Whilst the packing arrangements in CT complexes are known to affect the band ga..View full abstract
We gratefully acknowledge the financial support of the Australian Research Council. Part of the research reported was undertaken at the powder diffraction beamline at the Australian Synchrotron, Victoria, Australia.