Abstract
The anisotropic motion of a model dinitroxide spin label, 1,4-didoxylcyclohexane, has been studied by trapping the spin label in two organic inclusion crystals, thiourea and perhydrotriphenylene. The equatorial-equatorial trans chair is the dominant conformer observed, and it is in equilibrium with a small amount of the axial-axial trans chair conformer. The two conformers rotate or undergo large-amplitude oscillations in the tubular cavities of the host crystal. A rapid rotation model is presented and describes very well the experimental motion averaged dipolar splittings.
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