Abstract
A MISINTERPRETATION of the vibrational spectrum of diacetylene (HC≡C—C≡CH)1 led to very low values of the potential (force) constant corresponding to the central carbon–carbon bond. Although some justification was offered for this low value2,3 the recent experimental work of Jones4 and a correlation study of diacetylene and similar molecules5 led to the conclusion that the previous assignment of the fundamental frequencies and, therefore, the potential constants obtained from them, must be discarded. Several recent publications1,4,6 agree in giving a value for the central carbon–carbon bond-stretching potential constant which is substantially higher than the value corresponding to a single bond.
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References
Ferigle, S. M., Cleveland, F. F., and Meister, A. G., J. Chem. Phys., 20, 526 (1952), and references given there.
Longuet-Higgins, H. C., and Wheland, G. W., Ann. Rev. Phys. Chem., 133 (1950).
Hornig, D. F., ONR Technical Report No. 15 (1940).
Jones, A. V., Proc. Roy. Soc., A, 211, 285 (1952).
Ferigle, S. M., Cleveland, F. F., and Meister, A. G., Phys. Rev., 81, 302 (1951); J. Chem. Phys., 20, 1928 (1952).
Longuet-Higgins, H. C., and Burkitt, F. H., Trans. Farad. Soc., 48, 1077 (1952).
Coulson, C. A., and Longuet-Higgins, H. C., Proc. Roy. Soc., A, 193, 456 (1948).
Coulson, C. A., “Vol. Comm. Victor Henri”, 15 (Desoer, Liège, 1948).
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FERIGLE, S., WEBER, A. Potential Constants of Diacetylene. Nature 172, 399–400 (1953). https://doi.org/10.1038/172399a0
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DOI: https://doi.org/10.1038/172399a0
