DONOR-ACCEPTOR COMPLEXES OF INORGANIC PI ACCEPTOR, BIS-CIS-(1,2-PERFLUOROMETHYLETHENE-1,2-DITHIOLATO) NICKEL

Electrically conducting donor-acceptor complexes between the aromatic hydrocarbons perylene and pyrene and the powerful electron acceptor bis-cis-(1,2-perfluoromethylethene-1,2-dithiolato)nickel have been prepared. Their crystal structures have been determined from single-crystal X-ray diffraction studies. These 1:1 complexes are found to consist of stacks of alternating organic and inorganic molecules with the stacking axis parallel to the growth axis. The crystals are semiconductors having room-temperature resistivities of the order of 105 ohm cm. The activation energy for conduction is anisotropic for the perylene complex with a minimum activation energy along the stacking axis. Absorption bands attributed to an intermolecular charge-transfer transition have maxima in the near-infrared at an energy which is the same as the band-gap energy if the conductivity is assumed to be intrinsic, and if there is no energy barrier for conduction along the stacking axis. © 1969, American Chemical Society. All rights reserved.