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Fourier transform Raman spectroscopic study of lithium perchlorate solutions in acrylonitrile

1995; Wiley; Volume: 26; Issue: 8-9 Linguagem: Inglês

10.1002/jrs.1250260819

1097-4555

J. M. Alía, Howell G. M. Edwards, J. Moore,

Thermal and Kinetic Analysis

Abstract Lithium perchlorate solutions in acrylonitrile (propenenitrile), in a range of concentration between 1 and 6 molal, were studied by using Fourier transform Raman spectroscopy. The new band in the v (CN) region proceeding from the bound species Li + … (acrylonitrile) n and the modifications in the C—C stretching band were studied in detail by means of deconvolution and band‐fitting procedures. An average solvation number of ca . 2.3 was obtained without any correction for the ion pairing. The data obtained in the analysis of the perchlorate anion v 1 (symmetric stretch) band allow us to quantify the concentration of the different species (free perchlorate, solvent‐separated ion pairs and contact ion pairs) present, and to obtain a more realistic solvation number for the lithium ion in acrylonitrile solutions. This solvation number was estimated at 3.0 ± 0.1.