Charge-transfer material and process for producing the same, electron-transfer agent, photoreceptor for electrophotography and organic electroluminescence element using said charge-transfer material

An electrophotographic photoreceptor comprising an electroconductive substrate having at least a photosensitive layer disposed thereon, wherein the photosensitive layer contains as a charge-transfer material a compound represented by the following general formula (4):

• wherein X and Y are oxygen, R1 and R3 are tert-butyl, R2 and R4 are hydrogen, R5 is methyl, and R6 is selected from a group consisting of methyl, phenyl, para-chlorophenyl, para-bromophenyl, ortho-methylphenyl, para-methylphenyl, ortho-chlorophenyl, meta-chlorophenyl.

An electrophotographic photoreceptor comprising an electroconductive substrate having at least a photosensitive layer disposed thereon, wherein the photosensitive layer contains as a charge-transfer material a compound represented by the following general formula (4):

• wherein X and Y are oxygen, R1 and R3 are tert-butyl, R2 and R4 are hydrogen, R5 is n-propyl, and R6 is selected from a group consisting of phenyl, ortho-methylphenyl, para-isopropylphenyl, para-methylphenyl, ortho-chlorophenyl, meta-chlorophenyl, and 2,5-dichlorophenyl.