CRYSTAL-STRUCTURES CONTAINING DIOXAPYRENE DONORS

In search for new organic donors we have considered chalcogen substitu ted polyclic arenes such as dioxapyrene and dithiapyrene. This contrib ution presents the crystal structures of a charge-transfer complex of 3,8-diethyl-5,10-dimethyl-1,6-dioxapyrene (DEDMDOP) and two cation rad ical salts of 3,5,8,10-tetramethyl-1,6-dioxapyrene (TMDOP). The compou nds are DEDMDOP-TCNQ (1:1), (TMDOP)2PF6 and (TMDOP)2BF4, of which the latter two are isostructural. All three compounds crystallize in ortho rhombic space groups with the organic units in mirror planes leading t o strict crystallographic planarity. In the structure of DEDMDOP-TCNQ the two molecules alternate along the stacking axis with an interplana r distance of 1/2 a (3.37 angstrom). The salts of TMDOP have segregate d donor stacks separated by anion sheets. The interplanar distance is 1/2 a (3.40 and 3.39 angstrom).