Comparative study of Spectroscopic Analysis of 2 Chloro 5 Nitrobenzonitrile and 2,5 Dichlorobenzonitrile

This article presents the spectra of two substituted benzonitrile derivatives, 2-chloro-5-nitrobenzonitrile and 2,5-dichloro benzonitrile by infrared (IR) spectroscopy and Raman spectroscopy with Nujol. The traditional IR and Raman spectra for both compounds were recorded under room temperature conditions with KBr. In all cases the stretching, bending and deformation bands were assigned to molecular vibrations. The IR spectrum had a problematic assignment pointed out and the change in bands was described in terms of shifts or development associated with the chloro and nitro substituents or C-N and ring vibrations. Such an analysis allows for the differentiation of structure-property relations in substituted benzenes, which is valid with today's structure and naming conventions in organic chemistry. Data provided reasonable structural interpretation for each compound by way of small frequency shifts and intensity change. The current analysis provided reasonable structure for future specific studies.