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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 45,
  • Issue 10,
  • pp. 1641-1648
  • (1991)

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

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Abstract

The carbonyl stretching mode of 4-<i>x</i>-benzaldehydes increases in frequency as the mole % CHCl<sub>3</sub>/CCl<sub>4</sub> decreases and as the value of σ<sub><i>p</i></sub><sup>−</sup> or σ<sub><i>R</i></sub>° for the 4-<i>x</i> atom or group increases. Other functional groups such as OH, NO<sub>2</sub>, and CN are also affected by interaction with the CHCl<sub>3</sub> and/or CCl<sub>4</sub> solvent system. Other solvents may interact differently with each functional group so that, say, νC=O vs. σ<sub><i>p</i></sub><sup>−</sup>, σ<sub><i>R</i></sub>°, or solvent acceptor numbers (AN) may not correlate in a uniform manner in all solute/ solvent systems.

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