Study of molecular motion in t-butyl halides by pulsed proton magnetic resonance
- 1 January 1980
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 76, 550-555
- https://doi.org/10.1039/f29807600550
Abstract
The proton spin–lattice relaxation times of t-butyl chloride, bromide and iodide were measured at 60 MHz over the temperature interval 330-100 K. In this interval three solid phases have been observed for t-butyl chloride and bromide but only two solid phases for the iodide. The temperature dependence of T1 demonstrates that three types of molecular motion, translational, molecular tumbling and methyl group reorientation, occur in turn over the temperature interval. Activation energies for the methyl group reorientations were 10.8, 9.0 and 9.6 kJ mol–1, respectively, for t-butyl chloride, bromide and iodide. The experimental minima in T1 at low temperatures are in agreement with theoretical expectation for these three compounds.Keywords
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