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Volume :1 Issue : 1 1974      Add To Cart                                                                    Download

SPECTROSCOPIC INVESTIGATION OF THE EFFECT OF MEDIUM ON THE FREQUENCY OF IR RADIATION

Auther : M.I.NASSER AND A.H. BASSYOUNI

Department of Physics, University of Kuwait AND Department of Physics, University of Zagazig, Egypt

Abstract

 

An extensive spectroscopic study of the solvent effect upon the frequency of IR-absorption bands is presented. Due to the special importance of the (X-H) bonds, this study was restricted to the (N-H) and the (O-H) bonds of diphenylamine and a-naphthol respectively. The frequency of both the (N-H) and the (O-H) groups in the gas state (‎Vg) was experimentally measured using a specially designed heated gas cell. It was found that    Vg (N-H) = 3436 cm-1 and ‎Vg (O-H) = 3668 cm-1. Thus the solvent frequency shifts could be precisely determined. The attribution of the frequency shifts to both the solvent dielectric properties and to the solute-solvent interactions is fully investigated. It was found that in the case of the nonpolar solvents, the dielectric properties play the major role in the frequency shifts, while in the case of the polar and the aromatic solvents, the solute-solvent interactions play the major role in the frequency shifts. It was also found that the solute-solvent interactions could result in hydrogen bonding formation.

 

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