Abstract
The linear-dichroic infrared (IR-LD) spectroscopy of oriented solid samples as suspension in nematic liquid crystal have been carried out
for experimental IR-band assignment and structural information of 2-{5,5-dimethyl-3-[2-(2,4,6-trimethoxyphenyl)vinyl]cyclohex-2-enylidene}
malononitrile polymorphs. The last data have been compared with known crystallographic ones, thus determining the validity of IR-LD spectral
conclusions as well as its possibility to determination of Davydov’s splitting effect and separation of pairs of maxima corresponding to nonequivalent molecules included in the unit cell of given compound. The experimental structural and spectroscopic data in our case are supported
with theoretical DFT ones, obtaining both the electronic structure and vibrational frequencies in gas phase.