Aromatic ring dynamics in crystalline penicillins from variable temperature 13C cross-polarisation magic-angle-spinning n.m.r.

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Abstract
A combination of lineshape analysis and magnetisation transfer experiments in variable temperature 13C cross-polarisation magic-angle-spinning n.m.r. spectroscopy has enabled the determination of rate and activation parameters for aromatic ring rotations over a motional frequency range of 10–2–106 Hz in crystalline penicillin derivatives.