Unperturbed NO₂ Stretching Frequencies in the Vibrational Spectra of 1,4-Dinitrobenzene

Authors: Andreev, George N.¹; Juchnovski, Ivan N.²

Source: Applied Spectroscopy, Volume 46, Issue 8, Pages 1211-1312 (August 1992) , pp. 1304-1306(3)

Publisher: Society for Applied Spectroscopy

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Abstract:

When the solute/solvent interaction was studied in a series of organic compounds containing the nitro group, infrared (IR) spectra showed that the nitro antisymmetric stretching mode [v_as(NO₂)] of 1,4-dinitrobenzene has the highest frequency among all studied nitrobenzenes, whereas the symmetric stretching mode [v_s(NO₂)] is one of the lowest. The v_as(NO₂) frequency was assumed to be regular, and no attention was paid to its particularly high value. The v_s(NO₂) band frequency of 1,4-dinitrobenzene appears at a lower frequency than the "expected" value. An attempt has been made to explain this deviation in terms of the Ph-N bond participation in the vibration v_s(NO₂) of 1,4-dinitrobenzene.

Keywords: Vibrational spectra; Vibrational coupling; Nitrobenzenes; Isotopic shift

Document Type: Short communication

DOI: http://dx.doi.org/10.1366/0003702924124033

Affiliations: 1: Department of Chemistry, University of Plovdiv, 4000 Plovdiv, Bulgaria 2: Institute of Organic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Publication date: 1992-08-01

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