FTIR vibrational and 13C NMR spectroscopic study of the effect on ionic transport behavior of NaClO4 in N,N-dimethylacetamide and its binary mixtures with 2-aminoethanol

This study explores the vibrational and nuclear magnetic resonance spectra of free ions as well as those coordinated with sodium ions, which are commonly utilized to study ion-ion and ion-solvent interactions in electrolytic solutions of dipolar aprotic solvents. The spectral investigations suggested the origin of new bands due to solvent shell of sodium ions. The ion-solvent interactions were confirmed by the carbonyl symmetric stretch ring deformation bands in N,N-dimethylacetamide. The probability of new contact ion pairs between sodium and perchlorate ions with N,N-dimethylacetamide (DMA) increases on enhancing the increase in electrolytic concentration of sodium perchlorate in binary solvent mixtures. FTIR vibrational spectra and C-13-NMR spectra of several electrolytic concentration solutions of sodium perchlorate (NaClO4) were studied in pure DMA and its binary mixture with 2-aminoethanol (AE). The study investigates the vibrational spectra of free ions as well as those coordinated with Na+ ions, which are widely used to study ion-ion and ion-solvent interactions in electrolytic solutions of dipolar aprotic solvents. The solutions of the salt at different concentrations were prepared in the molar ratio of NaClO4/AE/DMA (4:4:4) from 0.25 to 1.0 m. The vibrational spectroscopic and C-13-NMR studies suggested the origin of new bands due to solvent shell of Na+ ions, which is due to O=C-N deformation behavior. The study revealed that the Na+ ions interacted through the coordinate bond to both N-atom of NH4+ structure as well as oxygen atom of the C=O (carbonyl group) of amide. The interaction between Na+ ions and solvent suggests preferential solvated by DMA in the binary solvent mixtures. The ion-solvent interactions were confirmed by the carbonyl symmetric stretch ring deformation bands in DMA. The new contact ion-pairs between Na+ and ClO4- ions are more probable with increase in the concentration of sodium perchlorate in binary solvent mixtures.