VIBRATIONAL SPECTROSCOPIC STUDIES OF INTERACTIONS BETWEEN LICLO4 AND THE PLASTICIZER DIMETHYLFORMAMIDE

The Raman and infrared (IR) spectra of dimethylformamide (DMF) contain ing different amounts of lithium perchlorate have been recorded and an alyzed, respectively. It has been found that the Li+ ions interact wit h both the nitrogen atom in the quaternary ammonium structure and the oxygen atom in the C=O group of DMF. The activation of the IR-forbidde n nu(1) mode and the splitting of the nu(4) mode of ClO4- anions indic ate that ion aggregates are formed at low LiClO4 concentration. The re sults of the IR spectroscopic measurements also suggest that the ionic aggregation in the LiClO4-DMF system may have its own characteristics .