Abstract:

The solvent effects on the NC stretching vibration frequency of  TCNQ were investigated by means of the infrared spectra and analysed by several theoretical models of the molecular interaction. The results indicate that the frequency of the  NC of  TCNQ increased with the solvent receptor decreased. The LSER equation was a good explanation using the AN\|DN model, which confirmed the frequency change was due to the receptor complex rather than the hydrogen bond. The UV\|visible absorption spectra  of  TCNQ in different solvents exhibited the  blue shift of its absorption peak with the increases of solvent polarity parameters E^T_N and E_T（30）, and  comparing the curves of the  two polar solvents parameters E_T（30） and E^T_N confirmed  E^T_N is better than  E_T（30） in describing the solvent polarity of TCNQ.

Key words: 7,7,8,8-tetracyanoquinodimethane (TCNQ);  , solvent effect;  , electron donor number, electron acceptor number;  , polarityparameters 