The crystal and molecular structure of tetracene

Abstract

Crystals of tetracene are triclinie, with two molecules in a unit cell of dimensions a = 7.98, b = 6.14, c = 13.57 A, a = 101.3 °, fl = 113.2 °, ~, =87.5 °, space group Pi. The structure, which has been determined from projections along the a and b axes, is closely related to the structures of naphthalene and anthracene. The two molecules in the unit cell are situated on independent centres of symmetry , the asymmetric unit consisting of two half-molecules. Both molecules are completely planar. Details of the molecular dimensions and of the intermolecular separations have been obtained.