Molecular Motion in Azulene and the Azulenes–(s)-Trinitrobenzene Molecular Complex in the Solid State

Abstract

Molecular motion of azulene in its own molecular crystal and in its complex with trinitrobenzene has been shown from wide-line n.m.r. and spin–lattice relaxation time measurements to occur in the solid state. Calculations of the n.m.r. spectral parameters based on a model where the azulene molecules are reorienting in their molecular planes by 180° jumps give satisfactory agreement with experimental values. The results are discussed with respect to the available X-ray data.