NEW MATERIAL:A compound expressed by formula I (Z- is anion). USE:A colorless and transparent spectroscopic photosensitizer for an organic photoconductor having an absorption in the far - near infrared regions and improved photosensitivity, and particularly useful as a photosensitive material for electrophotography. PROCESS:(A) A 2,6-di-tert-butyl-4-methylthiopyrylium salt expressed by formula II is reacted with (B) a 1-phenylamino-3-phenylimido-1-propene (or its salt with an acid) of the formula PhNH-CH=CH-CH=NPh at a molar ratio between (A) and (B) of preferably 1:0.3-1:1 and 80-140 deg.C for 1min-1hr to give the compound of formula I.
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