Polarized Infrared Spectra of TCNQ and TCNQ-d4 Single Crystals

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Abstract
The infrared‐active vibrations of the TCNQ molecular structure have been investigated by using the spectra of the powder and those of the (001) and (010) crystal planes in polarized radiation for both TCNQ and its fully deuterated analog. These measurements give most of the significant indications which can be drawn from infrared spectra for the localization and symmetry class identification of infrared active modes. As a result, a well‐based assignment of infrared‐active fundamentals, as well as some information on crystal field effects and on the optical behavior of this anisotropic crystal in the (010) plane, is given.