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Effect of Medium on the Intensity of Infrared Absorption Bands

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The paper presents an extensive study of the solvent effect upon the intensity of ir absorption bands. Because of the special importance of the (X—H) bonds (X=C, O, H), this study is restricted to the (N—H) and the (O—H) bonds of diphenylamine and α-naphthol, respectively. An easy way to calculate the integrated intensity directly from the record chart, saving much time and effort and avoiding a source of appreciable error, has been developed. The determination of the intensity in the gas phase (A g ) is difficult. An extrapolation method for determining (A g ) is presented. The values found are:

Ag (N—H) = 21.6 × 10−8 }abs. units

Ag (O—H) = 32.5 × 10−8 }abs. units

It is also found that the absolute solvent interactions play an important role in the intensity variation.

Keywords: Infrared, general; Solvent effects; Spectral analysis

Document Type: Research Article


Affiliations: Department of Physics, Kuwait University, Kuwait

Publication date: November 1, 1974

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