Molecular complexes. Part XVIII. Crystal and molecular structure of acenaphthene–tetrachloro-p-benzoquinone molecular complex

Abstract

Crystals of the title 1 : 1 molecular complex are monoclinic, a= 14·66, b= 13·44, c= 8·26 Å, γ= 94·4°, space group l2/b, Z= 4. The structure has been determined from diffractometer data by Patterson methods and refined by least squares to R 0·063 for 959 reflections. The dimensions of the component molecules are stacked alternately plane-to-plane along the a axis of the crystal, with a mean perpendicular separation 3·41 Å. The mode of donor–acceptor overlap does not correspond to a maximum in the calculated charge-transfer stabilisation energy, possibly owing to repulsive non-bonded intermolecular Cl ⋯ H interaction in the expected orientation.