FORMATION AND CRYSTAL AND MOLECULAR-STRUCTURE OF THE CHARGE-TRANSFER COMPLEX, TRICARBONYLPHENANTHRENECHROMIUM-1,3,5-TRINITROBENZENE

Arenetricarbonylchromium compounds form 1 1 charge-transfer adducts with 1,3,5-trinitrobenzene in solution, but only a few of these are stable in the crystalline form. The synthesis and structure of a 1 1 adduct of phenanthrenetricarbonylchromium with 1,3,5-trinitrobenzene is reported. The crystal structure has been determined by X-ray analysis. Space group P1 with a 10.37, b 13.73, c 17.24 Å and Z = 2. In the solid state the phenanthrene and benzene rings are parallel to each other. The structure is composed of stacks of alternating donor and acceptor molecules. The distances from the carbon atoms of the phenanthrene molecule to the mean plane of the trinitrobenzene molecule average at 336 pm, the distances from the carbonyl oxygen atoms to the mean plane of trinitrobenzene average at 269 pm. © 1979.