The infrared spectra of gaseous, liquid, and solid cyanoacetylene, H–C≡C–C≡N, have been observed in the region from 450 cm—1 to 3400 cm—1. Six of the seven fundamental vibrational frequencies expected for cyanoacetylene on the basis of a linear structure have been assigned and the remaining frequency has been estimated from observed combination bands. A force constant calculation has been carried out using a simple valence potential function.
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Turrell et al. (1957) studied this question.
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