Dynamics of Protons in Hydrogen-Bonded Systems: Propynoic and Acrylic Acid Dimers

This paper is part of a study of the origin of the abnormal infrared spectra of the stretching vibrations of protons in H-bonded species. An experimental ir study of the 2000–3000 cm−1 region of propynoic and acrylic acid dimers and of their deuterated analogs is presented. These ir spectra have been recorded with high resolution and intensity in order to be compared with a theoretical model which predicts positions and intensities of the lines. This model is briefly recalled, and the fit between theory and experiment is discussed. It is suggested that the theoretical model considered here, although in its first stage of development, represents the basic features of the mechanism of oscillation of protons in weak and moderate H bonds.