On the conformational equilibria between isobutyl halide (CH3)2CH–CH2X (X=Cl, Br and I) rotational isomers: A combined ultrasonic relaxation spectroscopic and computational study

2022 ◽  
pp. 413697
Author(s):  
Maria Risva ◽  
Panagiota Siafarika ◽  
Angelos G. Kalampounias
Keyword(s):  
Computational Study ◽  
Rotational Isomers ◽  
Conformational Equilibria ◽  
Ultrasonic Relaxation

Ultrasonic relaxation processes in liquid triethylamine

1956 ◽  
Vol 237 (1209) ◽  
pp. 233-244 ◽  
Keyword(s):  
Activation Energy ◽  
Energy Barrier ◽  
Ultrasonic Waves ◽  
Relaxation Processes ◽  
Activation Energy Barrier ◽  
Temperature Range ◽  
Rotational Isomers ◽  
Velocity Of Propagation ◽  
Ultrasonic Relaxation ◽  
The Difference

Measurements have been made of the velocity of propagation and the absorption of ultrasonic waves in liquid triethylamine over the temperature range 25 to 70° C and at frequencies of approximately 23, 66, 107, 148 and 192 Mc/s. The absorption results demonstrate the existence of a relaxation process which is attributed to the perturbation by the sound wave of an equilibrium between rotational isomers. The activation energy barrier and the difference in energy between the states are evaluated from an analysis of the results. The calculated dispersion of velocity is less than 1%. Values of the specific heat of triethvlamine are required in the analysis and are given in the paper for the temperature range 25 to 60°C. The results are discussed in the light of other measurements concerned with rotational isomers.

Ultrasonic Relaxation in Rotational Isomers

1959 ◽  
Vol 30 (1) ◽  
pp. 304-307 ◽  
Author(s):  
Joseph H. Chen ◽  
A. A. Petrauskas
Keyword(s):  
Rotational Isomers ◽  
Ultrasonic Relaxation
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