MOLECULAR AND CRYSTAL-STRUCTURE AND PROPERTIES OF TE-CONTAINING P-TERPHENOQUINONE ANALOGS

p-Terphenoquinone analogues containing a quinonoid type of tellurophen e skeleton in the central position have been prepared with a view to d eveloping a new type of organic photoconductive materials having ampho teric redox properties. X-ray structure analysis showed that each mole cule exhibited an asymmetric boat conformation owing to the bent struc ture of the whole ring system and the opposite twisting of two termina l rings. The molecular packing manner in the crystals depends on the s ubstituents on the terminal quinonoid rings. These compounds were elec trically amphoteric and afforded radical cation salts and CT complexes by electrochemical or chemical oxidation or by the reaction with an a ppropriate electron acceptor, respectively. Preliminary experimental r esults on the photoconductive properties of the neutral compound along with the electrical and magnetic properties of the radical cation sal ts and CT complexes are described.