IOSR Journal of Applied Chemistry (IOSR-JAC) e-ISSN: 2278-5736.Volume 16, Issue 5 Ser. I (May 2023), PP 01-03 www.iosrjournals.org DOI: 10.9790/5736-1605010103 www.iosrjournals.org 1 | Page Synthesis Of Photoconducting Polyester Of Triphenylamine-Benzoxazole Moiety. Dipak Kumar Mukhopadhyay Department of Chemistry, GhatalRabindraSatabarsikiMahavidyalaya, Ghatal, PaschimMedinipur, West Bengal, 721212, India Abstract : 4,4’ –diformyl-4’’-methoxytriphenylamine was synthesized by the treatment of 4-methoxy triphenyl amine with POCl3 and DMF mixture with stirring and then heated the mixture for 7h at 95 0 -100 0 c. After cooling, the mixture was poured into crushed ice and neutralized till P H =8.4,4’-bis [6-hydroxy benzoxazol-2-yl] -4’’- methoxy triphenyl amine was synthesized by the treatment of 4,4’ -diformyl-4’’-methoxy triphenyl amine with4- amino resorcinol in presence of 50 wt% of silica supported sodium hydrogen sulphate in the solvent medium of THF refluxed for 16h. Polyester was prepared from polycondensation of 4,4’-bis [6-hydroxy benzoxazol-2-yl] - 4’’-methoxy triphenyl amine with terephthaloyl dichloride in presence of triethyl amine in the solvent medium of DMF first at 0 0 c then stirred for 6h at room temperature. Keywords:4,4’-diformyl-4’’-methoxy triphenyl amine, 4,4’-bis[6-hydroxy benzoxazol-2-yl] -4”- methoxytriphenyl amine, polycondensation. --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 23-04-2023 Date of Acceptance: 05-05-2023 --------------------------------------------------------------------------------------------------------------------------------------- I. Introduction Carbazole derivatives are well- known to exhibit good electro and photoactive properties due to their high hole transporting mobility, strong absorption in the ultra violet spectral region and blue-light emission. Since the discovery of photoconductivity in poly( 9-vinyl carbazole) , carbazolecontaining derivatives became the subject of numerous investigations for applications in electro photography .The second wave of interest in carbazole-based CTMs is connected mostly with the discovery of organic light emitting diodes and photorefractive materials, carbazole-containing transporting materials are studied as the components of photo- voltaic devices and field effect transistors. Commercial availability and relative cheapness of the starting materials, simple synthesis, number of sites available for easy functionalization, good charge drift mobility and solubility in common organic solvents make these precursors attractive building blocks for the construction of more complex materials for optoelectronic applications. Photorefractive polymers have attracted considerable attention owing to their potential applications including high-density optical data storage, optical image processing, phase conjugation, lasing, dynamic holography, optical computing and pattern recognition. The necessary characteristics for a materials to be regarded as potentially photorefractive are photoconductivity. Polymer can be made by either incorporating these properties directly into polymer (fully functionalized polymer) or doping guest molecules into the polymer (guest-host polymer composite) to produce these properties. Most of the photo refractive polymers reported to date are based on guest-host polymer composite, which normally consist of four components (Photoconducting polymer host, NLO chromophore, plasticizer, and photosensitizer). We have synthesized and reported various photoconductingpolymer based on heteroaromaticdoner moiety like carbazole and indole. Another family of materials with strong election donating nature are poly (triaryl amine)s. They stand out due to their excellent hole transporting mobilities and good electrochemical stability. The Corresponding monomer triphenylamine (TPA) is used in commercial xerographic applications because of its excellent physical, photochemical and electrochemical properties of this hole conductor. Within the functional TPA moiety, the nitrogen centre can be easily oxidized resulting in effective transport of positive charge carriers via a radical cation species. The unsubstituted TPA can undergo dimerization to tetra phenyl benzidine (also triphenyldiamine, TPD). Low molecular weight TPDS showed high hole transport mobility. The TPA and TPD units can be incorporated either in the main chain or in the side chain of apolymer with a non-conducting backbone e,g. polystyrene. These polymeric analogues are used in HTMS, OLEDs, OPVs. In order to realize the solubility of TPA main chain polymers either methyl, alkyl, alkoxy chains have to be attached.