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KMID : 1059519960400060415
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Journal of the Korean Chemical Society
1996 Volume.40 No. 6 p.415 ~ p.419
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Solvent and Concentration Effects on Carbonyl Stretching Frequencies: Dialkyl Ketones
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Jung Young-Mee
Kang Jae-Soo
Nam Sang-Il
Lee Mu-Sang
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Abstract
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Hydrogen bonding, dielectric effects and steric effects are all factors which determine the carbonyl stretching frequency, νC=O of ketones in solution. The νC=O frequency of ketones is affected by change in concentration of ketones in various solvents. The νC=O frequency shifts to lower frequency in nonpolar solvents and shifts to higher frequency in polar solvents with the increasing volume% of ketones. In acetonitrle, the νC=O frequency shifts to higher frequency as the volume% of ketones is increased except dimethyl ketone. The νC=O frequency shifts to lower frequency as the solvent system becomes increasingly polar or with the increasing extent of intermolecular hydrogen bonding, as in the case of increasing volume% chloroform in CHCl3/CCl4 solvent system.
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