NMR studies of rotational motion at low viscosity

R. F. Evilia, J. M. Robert, S. L. Whittenburg

Research output: Contribution to journalArticlepeer-review

Abstract

We have measured the rotational correlation time of dilute solutions of several small molecules dissolved in supercritical fluids using 14N NMR spectroscopy. In supercritical fluids at the densities employed, the solubility is sufficiently high to obtain rapid acquisition of the spectra, while the viscosity is extremely small. Comparison of the rotational correlation times with the literature values obtained from light-scattering measurements at higher viscosity demonstrates that the Stokes-Einstein-Debye plot deviates from linearity as the inertial limit is approached. The measured correlation times compare favorably with the free-rotor correlation time.

Original languageEnglish
Pages (from-to)6550-6552
Number of pages3
JournalJournal of Physical Chemistry
Volume93
Issue number17
DOIs
StatePublished - 1989

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