Ion-Solvent Interaction Behaviour of Lithium Perchlorate in N,N-Dimethylacetamide and its Binary Mixtures with 2-Aminoethanol: FTIR Vibrational and NMR Spectroscopy Study

Abstract

FTIR vibrational spectra and NMR spectra were studied for different electrolytic concentrations of lithium perchlorate (LiClO₄) in pure N,N-dimethylacetamide (DMA) and its binary mixtures with 2-amino ethanol (AE) of the different salt concentration ranges from 0.25 to 1.0 M with a molar ratio of LiClO₄:AE:DMA (4:4:4). The ¹³C NMR and FTIR studies have been used to investigate the behaviour of O=C-N deformation vibration and change in chemical shift. Study revealed that the Li⁺ ions coordinate to the nitrogen atom of NH₄⁺ structure and O of the C=O group of DMA. The interaction between Li⁺ ions and solvent molecules was confirmed by the carbonyl stretch symmetric ring deformation bands in DMA. From both studies it was found that the intensity increases, band split and chemical shift values of C atom of C=O of amide group also change with the increase in the concentrations of LiClO₄ in binary mixtures of AE + DMA, indicating a strong coordination between Li⁺ ions and DMA.