Characteristic Group Frequencies

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Characteristic Group Frequencies


the identical or nearly identical vibrational frequencies of specific groups of atoms in various molecules that correspond to specific chemical bonds, such as C—H, C—C, C═C, C—Cl.

The stability of such frequencies is associated with the preservation of the dynamic properties of identical groups of atoms in different molecules. In many cases, it is possible to determine theoretically whether a given chemical group possesses characteristic group frequencies. The intensities of the spectral lines corresponding to the characteristic group frequencies of a particular chemical group in various molecules often have similar values. The existence of characteristic group frequencies in molecular spectra makes it possible to draw conclusions about molecular structure; the frequencies are of great importance in spectral analysis. The rates of chemical processes can be evaluated on the basis of changes in intensity of characteristic group frequencies.


Maiants, L. S. Teoriia i raschet kolebanii molekul. Moscow, 1960.
Kolebaniia molekul, 2nd ed. Moscow, 1972.
Sverdlov, L. M., M. A. Kovner, and E. P. Krainov. Kolebatel’nye spektry mnogoatomnykh molekul. Moscow, 1970.
Bellamy, L. J. Infrakrasnye spektry slozhnykh molekul, 2nd ed. Moscow, 1963. (Translated from English.)
Primenenie spektroskopii v khimii. Moscow, 1959. (Translated from English.)


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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