Abstract
The effect of random resonances and vibration anharmonicity on the isotopic ratios of frequencies for molecules containing hydrogen atoms has been studied. It was found that the “anomalous” frequency dependence of the v(XH)/v(XD) isotopic ratio of the stretching vibration frequencies observed for H-bonded systems can be explained in terms of the theory of harmonic vibrations of molecules. The substantial deviation of experimental v(XH)/v(XD) from the magnitude equal to the square root of the reciprocal ratio of adjusted masses results from random resonances between the stretching mode of the bridging proton and some other vibration of the system.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2090–2097, December, 1994.
This work was carried out with the financial support of the Russian Foundation for Basic Research, Project No. 94-03-09340.
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Yukhnevich, G.V., Tarakanova, E.G. Reasons for the variability of isotopic ratios of stretching vibration frequencies of H-bonded complexes. Russ Chem Bull 43, 1972–1979 (1994). https://doi.org/10.1007/BF00700154
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DOI: https://doi.org/10.1007/BF00700154