Study of the ultrasonic relaxation and <i>cis–trans</i> isomerization in propyl formate: Evidence from low frequency spectrometry
S. Z. MirzaevHeat Physics Department, Uzbek Academy of Sciences, Katartal 28, Tashkent 700135, UzbekistanP. K. KhabibullaevHeat Physics Department, Uzbek Academy of Sciences, Katartal 28, Tashkent 700135, UzbekistanВ. С. КононенкоHeat Physics Department, Uzbek Academy of Sciences, Katartal 28, Tashkent 700135, UzbekistanA. A. SaidovHeat Physics Department, Uzbek Academy of Sciences, Katartal 28, Tashkent 700135, Uzbekistan
ABI
Abstract
The ultrasonic attenuation of pure propyl formate was measured in the frequency range from 80 kHz to 150 MHz, over the temperature range from 20 °C to 70 °C. From the temperature dependence of a relaxation parameter of the ultrasonic attenuation, molecular parameters of propyl formate were calculated. The estimated value were 5.5 kcal/mol for activation enthalpy and 3.2 kcal/mol for the enthalpy difference between trans- and cis-isomers of propyl formate.
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