Molecular complexes. Part XX. Crystal and molecular structure of 9-methylanthracene–tetrachloro-p-benzoquinone molecular complex

Abstract

Crystals of the title 1 : 1 complex are monoclinic, a 7·29, b= 13·83, c= 9·53 A, γ= 103·35°, space group P2/b, Z= 2. The structure was determined from diffractometer data by direct methods and refined by least squares to R 0·052 for 860 reflections. The molecules are stacked alternately characteristically plane-to-plane along the a axis. The 9-methylanthracene is disordered, so that the methyl group appears to be distributed randomly between two possible positions related by an inversion centre. The mode of overlap of the electron-donor and -acceptor molecules is very close to the orientation which is expected to produce maximum donor–acceptor charge-transfer interaction.