The carbonyl stretching mode of 4-x-benzaldehydes increases in frequency as the mole % CHCl3/CCl4 decreases and as the value of σp− or σR° for the 4-x atom or group increases. Other
functional groups such as OH, NO2, and CN are also affected by interaction with the CHCl3 and/or CCl4 solvent system. Other solvents may interact differently with each functional group so that, say, νC=O vs. σp−,
σR°, or solvent acceptor numbers (AN) may not correlate in a uniform manner in all solute/ solvent systems.
The Dow Chemical Company, Analytical Sciences Laboratories, 1897 Building, Midland, Michigan 48667
Publication date: December 1, 1991
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