Thermodynamic Properties of Diiodoacetylene and Some Symmetrical-Top Acetylenes

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Abstract
In this paper tables are presented of the thermodynamic functions—heat content, free energy,entropy, and heat capacity—of diiodoacetylene, methylchloroacetylene, methylbromoacetylene, methyliodoacetylene, methylacetylene, and methyldeuteroacetylene, for several temperatures from their boiling points up to 1000°K, for the ideal gaseous state at one atmosphere pressure. These functions were calculated from the Raman spectral data for all of the substances except methyldeuteroacetylene, for which the frequencies used were those calculated with force constants transferred from methylacetylene.