Premium
The 7,7′, 8,8′‐tetracyano‐p‐quinodimethanide salt of the N‐n propyl quinoxalinium cation — its structure, conductivity, and triplet spin excitons
Author(s) -
Firlej L.,
Graja A.,
Rajchel A.,
Woźniak K.,
Krygowski T. M.
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221400214
Subject(s) - seebeck coefficient , triclinic crystal system , conductivity , chemistry , semiconductor , organic semiconductor , exciton , crystal structure , electrical resistivity and conductivity , impurity , electron paramagnetic resonance , crystallography , condensed matter physics , materials science , nuclear magnetic resonance , physics , optoelectronics , organic chemistry , quantum mechanics
A new organic semiconductor (N‐n propyl quinoxalinium) + (7,7′,8,8′‐tetracyano‐p‐quinodimethanide) 2 − is synthesized and characterized by elemental analysis and X‐ray diffraction. The electrical dc conductivity, the thermoelectric power as well as the ESR spectra are reported and discussed. The crystal is of triclinic symmetry. TCNQ moieties stack plane‐to‐plane, in stoichiometric groups of four; adjacent columns from sheets interleaved by the cations. The charge transport properties are discussed in terms of a one‐electron semiconductor model with low temperature behaviour controlled by electrically active impurities. The ESR spectra are interpreted by the model of Q 1‐D mobile triplet excitons; it is consistent with the charge localization found by bond lengths analysis and assumed by the model of the electrical transport.