SYNTHESES, CHARACTERISTICS AND ELECTROPHOTOGRAPHIC PROPERTIES OF NEW DITHIOSQUARYLIUM DYES

A new class of dithiosquarylium dyes (DTSQ) has been synthesized by th e reaction of squarylium dye (Se) with Lawesson's reagent or P4S10 The lambda(max), of DTSQ dyes undergoes a bathochromic shift of about 25 nm compared with corresponding Se dyes. The visible absorption spectra of DTSQ dyes are well accounted for by Pariser-Parr-Pople Molecular O rbital (PPP-MO) calculations. Electrophotographic characteristics of n egatively charged dual layered photoreceptors with DTSQ for charge gen eration materials (CGM) and uinoline-6-carboxyaldehyde-1',1'-diphenylh ydrazone as a charge transport material (CTM) have been investigated. The photoreceptor that used DTSQs exhibited high photosensitivity at w hite light. (C) 1998 Elsevier Science Ltd. All rights reserved.