Field-swept 33S NMR study of elemental sulfur
Abstract
Field-swept 33S NMR spectra of a cyclic octaatomic molecule of elemental sulfur, α-S8, are presented. The spectra were acquired at a Larmor frequency of 16.2 MHz and using a superconducting magnet at between 6.32 and 0.50 T. Methods were developed for analyzing the field-swept 33S NMR spectra in which both Zeeman and quadrupole interactions were dominant. The quadrupole coupling constant, CQ, and the asymmetry parameter, ηQ, for α-S8 were found to be 43.68 MHz and 0.57, respectively. T1 measurements of α-S8 were conducted using the nuclear quadrupole resonance signals, and the activation energy was determined to be 54(1) kJ mol-1 from these T1 measurements. The molecular motion was assigned to ring-puckering of α-S8 molecules within the crystal structure.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- January 2015
- DOI:
- 10.1016/j.cplett.2014.10.061
- Bibcode:
- 2015CPL...618...20Y