A Study of Ion Pairing in Acetonitrile Solutions Containing Magnesium Perchlorate Using ATR-FTIR Spectroscopy
Abstract
A study of ion pairing for Mg(C104)2 dissolved in acetonitrile has been carried out using attenuated total reflection FTIR spectroscopy. The present results indicate that the coordination number for ligands around the Mg2+ ion is approximately four, and not six as previously reported Ion pairing is relatively strong with 70 percent of the Mg2+ ions forming contact ion pairs with on perchlorate ion. The spectral characteristics of acetonitrile associated with Mg2+ have been clearly distinguished from those of the free molecule. By comparing spectra in deuterated and protonated solvents, it has been shown for the first time in solution, that the ion paired perchlorate ion has an absorption band at 933 cm-1. The effect of Fermi interaction on the position of the blue shifted C = N band for coordinated acetonitrile is examined and discussed with respect to determination of the effect of the cation charge/radius ratio on the shifted band.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 24, 1992
- Accession Number
- ADA247229
Entities
People
- Guojun Liu
- William Ronald Fawcett
Organizations
- University of California, Davis