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KMID : 1059519940380030179
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Journal of the Korean Chemical Society
1994 Volume.38 No. 3 p.179 ~ p.185
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Solvent Effects upon Nitrile Group Frequency Shifts of Raman Spectra: Acetonitrile and Benzonitrile
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Seo Seong-Hun
Jung Young-Mee
Lee Mu-Sang
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Abstract
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The Raman stretching frequency of nitrile group was affected by change of solvents and its in concentration in same solvent. In the case of acetonitrile, nitrile group stretching frequencies were observed in the region of 2247.3∼2254.9 cm-1 with various solvents. While in benzonitrile, they were found in the region of 2226.1∼2230.3 cm-1. With the addition of water in acetonitrile,νC≡N was shifted to high frequency from 2250.1 cm-1 in pure acetonitrile to 2257.7 cm-1 in 90% water forwhich had with higher volume % of water caused higher hydrogen-bonded equilibrium between methyl protons and water. The νC≡N frequency for nitrile group was shifted to high frequency by solvent inductive effect with the increasing mixed solvent (CHCl3/CCl4) mole% ratio
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