PERI-DICHALCOGEN BRIDGED POLYCYCLIC AROMATIC-HYDROCARBONS AS NOVEL ELECTRON-DONORS FOR ORGANIC METALS

The development of polycyclic aromatic hydrocarbons characterized by t he addition of dichalcogen bridged groups at their peri-positions as n ovel electron donors of a non-TTF type is described. These compounds h ave been chiefly designed by structural modifications of the prototypi cal tetrathiotetracene; that is, by replacement of the skeletal aromat ic rings and of the bridged chalcogen atoms as well as by the introduc tion elf alkyl groups. Most of them are superior electron donors able to form highly conducting molecular complexes.