Carbon and van der Waals materials

Analysis of absorption band progressions in long-chain $n$-alkanes

S. A. Gur'eva^a, V. A. Marikhin^a, A. K. Borisov^a, E. N. Vlasova<sup>b

a</sup> Ioffe Institute, St. Petersburg
^b Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg

Abstract: An analysis of absorption band progressions in the IR spectrum of monodisperse tricosane $n$-C$_{23}$H$_{48}$ was conducted. Dispersion curves were obtained for the absorption band progressions of the rocking vibrations of CH$_2$ groups and the stretching (skeletal) vibrations of C–C bonds. The interaction parameters of the studied vibrations were determined based on the coupled oscillator model in the selected regions corresponding to the approximation of interaction between the nearest neighbors. For the first time, it was established that the interaction parameters of the vibrations depend significantly on the magnitude of the phase shift.

Keywords: $n$-alkanes, IR spectroscopy, absorption band progressions, coupled oscillator model.

Received: 02.09.2025
Revised: 20.11.2025
Accepted: 22.11.2025

DOI: 10.61011/FTT.2025.11.62144.242-25

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