1,8-Dinitro-4,5-dihydroxyantraquinone—Solid-state linear-polarized IR-spectroscopy of oriented colloid particles as a suspension in nematic liquid crystal

By means of the linear-polarized IR-spectroscopic (IR-LD) tool to study the oriented solids samples as a colloid suspensions in nematic liquid crystal, the influence of the short contacts and π–π interactions in crystalline phase on IR-bands assignment and profile, i.e., relationship structure-spectroscopic properties, is studied in model system 1,8-dinitro-4,5-dihydroxyantraquinone. For a higher accuracy of the spectroscopic assignments a predetermination of the crystal structure in the same crystalline sample used in IR-LD spectroscopic elucidation is done. Some important aspects of π–π interactions and short contacts in solid phase are described. The advantages of the IR-LD method for an orientation of samples are demonstrated.