Abstract
A new experiment for the undergraduate physical chemistry laboratory is presented for the application of dynamic nuclear magnetic resonance (DNMR) spectroscopy to the study of internal rotation kinetics in N, N-dimethylacetamide (DMA). Spin-lattic relaxation times (T1) were measured by the inversion recovery method and rates of internal rotation about the amide bond in DMA were measured bya spin-saturation transfer method in the temperature range 5-23°C. The activation parameters, DeltaH298 = 70.6+1.4 kJ/mol and DeltaS298 = -11+5 kJ/mol, were determined from the temperature dependence of the rate of internal rotation. Through the temperature range used in the present work is quite narrow compared with the line-shape analysis experiment, the derived thermodynamic data are in excellent agreement with more extensive measurements.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
