A Raman band study of propyne in the liquid phase and in solutions with inert and active solvents as a function of temperature (minus;80 to+80thinsp;deg;C) and pressure (1ndash;4000 bar) is reported. An increase of the reorientational correlation times tgr;Vthgr;with increasing pressure was found. It is shown that the theoretical correlation functions for diffusionhyphen;type models (the extended diffusion theory and the Fokkerndash;Planckndash;Langevin friction theory) can reproduce the experimental correlation functions of propyne only in the absence of hydrogen bonding. It is also shown that a relatively free rotation of the propyne symmetry axis in acetonendash;propyne complexes takes place even at the highest pressures, and two simple pictures of the motion are proposed.
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