Bulletin of the Korean Chemical Society

  • 제17권2호
  • /
  • Pages.128-131
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  • 1996
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Concentration and Solvent Effects upon Carbonyl Streching Frequency Shifts of Raman Spectra: 4-Substituted Benzaldehydes

  • 발행 : 19960200
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초록

From Raman spectra, the ${\nu}g$C=O frequencies of 4-substituted benzaldehydes were found to correlate with the ${\sigma}_p$ values of the 4-x atom or group as well as the acceptor number (AN) values of solvents. In various solvents, the ${\nu}g$C=O frequency of benzaldehyde decreased upon the increase of benzaldehyde concentration. This shift was mainly due to the hydrogen bonding between the carbonyl oxygen and/or aldehydic proton of benzaldehyde and the solvent molecules. Over the 1-80 volume % change, the ${\nu}g$C=O frequency of benzaldehyde down shifted from 1709.4 $cm^{-1}$ to 1700.2 $cm^{-1}$ in CCl4 solution and from 1703.0 $cm^{-1}$ to 1698.0 $cm^{-1}$ in $C_2H_5OH$ solution. This is due to the fact that hydrogen bonding between the benzaldehyde and C2H5OH was much stronger than that between the benzaldehyde and the other solvents.

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참고문헌

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피인용 문헌

  1. Raman spectral studies on 2′-hydroxyacetophenone in binary liquid mixtures vol.61, pp.None, 1996, https://doi.org/10.1016/j.vibspec.2012.01.015