Abstract

Fourier transform near-infrared (FT-near-IR) and FT-IR spectra have been measured for <i>cis</i>-9-octadecen-1-ol in CCl₄ solutions at various concentrations and temperatures partly to investigate its self-association and partly to explore its near-IR spectrum. Both spectra have demonstrated the appearances of bands due to free terminal OH groups of the linear dimer (open-chain dimer) and oligomer of the alcohol. They are observed at 3621 and 7070 cm^-1 in the IR and near-IR regions, whose frequencies are lower by 16 and 34 cm^-1, respectively, than those of the corresponding bands due to a free OH group of the monomer. The spectral changes in both regions suggest that (1) at concentrations below 0.10 M, the alcohol exists mostly as the monomer and dimer, and with increasing temperature the dimer dissociates into the monomer; and (2) as the concentration is increased, it associates to form aggregates (such as tetramer), and with temperature increase the aggregates dissociate into the dimer and monomer. The molar absorption coefficient of the band due to the first overtone of the stretching mode of the terminal OH groups has been determined to be 0.139 dm³ mol^-1 cm^-1. It is approximately 8% of that of the first overtone of the monomeric OH group (1.63 dm³ mol^-1 cm^-1). The anharmonicity of an OH stretching mode of the alcohol has been investigated for various OH groups, free, terminal, and hydrogen-bonded, by comparing the frequencies of the bands due to the OH stretching modes with those of the bands due to the corresponding first overtones. The anharmonicity of the stretching mode of the terminal OH groups of the associated species is very similar to that for the free OH group of the monomer.

Water cluster interpretation of IR absorption spectra in the 8–14-μm wavelength region

S. H. Suck, J. L. Kassner, and Y. Yamaguchi
Appl. Opt. 18(15) 2609-2617 (1979)

Absorption and scattering in low-loss polymer optical waveguides

Claire Pitois, Anders Hult, and Dorothea Wiesmann
J. Opt. Soc. Am. B 18(7) 908-912 (2001)

Combination transitions due to stretching and librations of OH⁻ ions in LiNbO₃

László Kovács, Krisztián Lengyel, and Viktor Szalay
Opt. Lett. 36(18) 3714-3716 (2011)

Structure of the Associated OH Valence Vibration Band in Light and Heavy Acetic, Trichloroacetic, and Trifluoroacetic Acids*

Nelson Fuson and Marie–Louise Josien
J. Opt. Soc. Am. 43(11) 1102-1105 (1953)

Photoacoustic spectroscopy of vibrational overtones in polyatomic molecules

Howard L. Fang and Robert L. Swofford
Appl. Opt. 21(1) 55-60 (1982)