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Kinetics of Internal Rotation of N,N-Dimethylacetamide: A Spin-Saturation Transfer Experiment

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Russell L. Jarek , Robert J. Flesher and Seung Koo Shin

Department of Chemistry, University of California at Santa Barbara, Santa Barbara, CA 93106

J. Chem. Educ., 1997, 74 (8), p 978

DOI: 10.1021/ed074p978

Publication Date (Web): August 1, 1997

Section:

History, Education, and Documentation

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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Equilibrium

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Article

Kinetics of Internal Rotation of N,N-Dimethylacetamide: A Spin-Saturation Transfer Experiment