Abstract
The dipole moments of four terminal diacetylenes and three terminal monoacetylenes were measured in the gaseous phase at 35°C using a high-precision heterodyne beat apparatus. The results obtained were interpreted in terms of primary and induced bond moments on the assumption that the above compounds exist as equilibrium mixtures of rotational isomers corresponding to trans and gauche conformations of the various C–C bonds. The composition of these equilibrium mixtures of rotational isomers was assumed to depend on a single parameter expressing the relative stability of gauche and trans conformations. The value of this parameter found from our results agreed satisfactorily with the results obtained by Bartell and Kohl from electron-diffraction measurements on n-paraffins.
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