"Vanadyls from oil shale. Rotational motion studied by electron spin re" by Barry B. Garrett and Wilson M. Gulick
 

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

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