Fourier transformed infrared spectral investigations of molecular interactions in propionic acid-2-propanol binary system

FTIR spectra of propionic acid (PA), 2-propanol (PROH) and its binary mixtures with varying molefraction of the PA were recorded in the region 500-3500 cm(-1), to investigate the formation of hydrogen bonded complexes in a mixed system. The observed features in v(C=O), v(C-O) and delta(COH) of PA, v(CO) of PROH and delta(COH) of PA + PROH have been explained in terms of the hydrogen bonding interactions between PROH and PA and dipole-dipole interaction. The dipole moment derivative for the above mentioned vibrational modes have also been predicted from the integrated absorbance. The intrinsic linewidth for the vibrational modes v(C-O) and delta(COH)of PA has been elucidated using Bondarev and Mardaeva model. (C) 2009 Elsevier B.V. All rights reserved.