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Infrared Study of Benzaldehyde and 4-Substituted Benzaldehydes in Carbon Tetrachloride and/or Chloroform Solutions: The Carbonyl Group

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The carbonyl stretching mode of 4-x-benzaldehydes increases in frequency as the mole % CHCl3/CCl4 decreases and as the value of σ p or σ R ° 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. σ p , σ R °, or solvent acceptor numbers (AN) may not correlate in a uniform manner in all solute/ solvent systems.

Keywords: 4-Benzaldehydes; Carbonyl stretching; Group frequencies; Infrared; Solvent effects

Document Type: Research Article


Affiliations: The Dow Chemical Company, Analytical Sciences Laboratories, 1897 Building, Midland, Michigan 48667

Publication date: December 1, 1991

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