Characterizing of Model Direct Dyes Interactions with Cotton Cellulose Via 1D and 2D Raman Spectroscopy

Abstract

FTR spectroscopie was employed to describe the functional groups responsible for binding with cotton cellulose. In addition to finding direct dye–cellulose interactions involving hydroxyl groups in the host fiber, it is postulated that intermolecular interactions exist between dye molecules and glycosidic groups. At present, an analytical chemist who wants to make an exhaustive description of compounds, mixtures, polymers or biological samples under examination needs high-tech instrumentation and the latest methods of data processing and visualization. One of the most dynamically developing methods of data interpretation is 2D spectroscopy. This method is used for analyzing IR, NIR, Raman, UV–Vis and fluorescent spectra, as well as in X-ray scattering and mass spectroscopy techniques. This paper attempts to provide a general answer to the question of how model direct dyes interact with cellulose structure. For assessing the interactions between model direct dyes and cotton cellulose, the 1D FTR and 2D FTR were chosen. To this end, synchronic and asynchronic 2D maps for FTR spectra were constructed. In a synchronic map, bands with 1100 cm−1 and 1125 cm−1 wavenumbers are responsible for the interaction of model dyes with COC groups or CC rings (at 1125 cm−1) in cotton. Information obtained through analyzing synchronic maps is confirmed by the analysis of bands generated in asynchronic maps.