Vanadyls from oil shale. Rotational motion studied by electron spin resonance spectroscopy
Document Type
Article
Publication Date
1-1-1983
Abstract
Electron spin resonance studies of several vanadyl complexes from the Antrim oil-shale formation of the lower Michigan peninsula reveal a wide range of rotational correlation times. The hyperfine splittings and g factors are all consistent with porphyrin structures, but three vanadyls have very different rotational correlation times. At ambient temperature, one gives a motionally averaged spectrum, one gives a slow-tumbling spectrum and one has its spectrum broadened into unobservability. A temperature-dependence study was carried out for the species which is in the slow tumbling region at ambient temperature. A rotational correlation time of 4.0 × 10 < sup> -8 s rad < sup> -1 is estimated for this species at 303 K and an activation energy of 6.9 kcal mol < sup> -1 is estimated for the rotation.
Publication Title
Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
Recommended Citation
Garrett, B.,
&
Gulick, W.
(1983).
Vanadyls from oil shale. Rotational motion studied by electron spin resonance spectroscopy.
Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases,
79(8), 1733-1740.
http://doi.org/10.1039/F19837901733
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/8561