Ultrasonic investigations of the relaxation processes related to the presence of the group –C = 0/NH in molecules
Abstract
Measurements of the velocity and the absorption coefficient of ultrasound were taken in monosubstituted amides as a function of temperature and frequency. It was found that a single relaxation process related to rotation of molecules around the C–N bond occurs over the temperature and frequency range investigated. Termodynamic parameters which characterize the process observed were determined.References
[1] J. E. WORSHAM, M. E. HABBS, The electric moments association and structure of some N-mono-substituted amides, J. Amer. Chem. Soc., 76, 206 (1954).
[2] G. R. LEADER, J. F. GORMLEY, The electric constant of N-methylamides, J. Amer. Chem. Soc., 73, 5731 (1951).
[3] D. E. D GRAFF, G. B. B. M. SUTHERLAND, Vibrational spectrum of N-methylformamide, J. Chem. Phys., 26, 716 (1957).
[4] L. A. La PLANCHE, M. T. ROGERS, Cis and trans configurations of the peptide bond in N-monosubstituted amides by nuclear magnetic resonance, J. Amer. Chem. Soc., 86, 1, 337 (1964).
[2] G. R. LEADER, J. F. GORMLEY, The electric constant of N-methylamides, J. Amer. Chem. Soc., 73, 5731 (1951).
[3] D. E. D GRAFF, G. B. B. M. SUTHERLAND, Vibrational spectrum of N-methylformamide, J. Chem. Phys., 26, 716 (1957).
[4] L. A. La PLANCHE, M. T. ROGERS, Cis and trans configurations of the peptide bond in N-monosubstituted amides by nuclear magnetic resonance, J. Amer. Chem. Soc., 86, 1, 337 (1964).
