IOSR Journal of Applied Chemistry (IOSR-JAC) e-ISSN: 2278-5736.Volume 11, Issue 7 Ver. I (July. 2018), PP 01-05 www.iosrjournals.org DOI: 10.9790/5736-1107010105 www.iosrjournals.org 1 |Page Synthesis of Photoconducting Polyester and Polyurethane of Indole Ring Dipak Kumar Mukhopadhyay Institute of Science & Technology, C.K Town, 721201, West Bengal, India *Corresponding author: * Dipak Kumar Mukhopadhyay Abstract: N-ethyl-3-methyl indole was synthesized by treating ethyl iodide with 3-methyl indole in presence of sodium hydride in the solvent medium of DMF. N-ethyl-3-bromomethyl indole was prepared by reacting N- ethyl-3-methyl indole with N-bromosuccinimide and benzoyl peroxide in the solvent medium of benzene. N- ethyl-3-(N,N-diethanolamino methyl) indole was synthesized by treating N-ethyl-3-bromomethyl indole with diethanolamine in presence of potassium Carbonate and trace amount of 18-crown-6 in the solvent medium of DMSO. Polyester was synthesized by treating N-ethyl-3-(N,N-diethanol amino methyl) indole with diacid chloride monomer, 6FBC at 70 0 c in the solvent medium of 1,2-dichloroethane.Polyurethane was synthesized by reacting the monomer, N-ethyl-3-(N,N-diethanolaminomethyl) indole with TDI in the solvent medium of toluene. All the monomer and polymers was characterized by IR, UV and NMR spectroscopy. Keywords: N-ethyl-3-methyl indole, N-ethyl -3-bromomethyl indole, N-ethyl-3-(N,N-diethanol amino methyl)indole , Polyester , Polyurethane, Polymerization. --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 12-06-2018 Date of acceptance: 03-07-2018 --------------------------------------------------------------------------------------------------------------------------------------- I. Introduction: Carbazole derivatives are well-known to exhibit good electro and photo active properties due to their high hole transporting mobility, strong absorption in the ultraviolet spectral region and blue – light emission. Since the discovery of photoconductivity in poly(9-vinyl Carbazole)(PVK) Carbazole–containing derivatives became the subject of numerous investigations for applications in electrophotography. The second wave of interest in Carbazole-based CTMs is connected mostly with the discovery of organic light emitting diodes and photorefractive materials. Apart fron the electrophotographicphotoreceptors, 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, dynamicholography, optical computing and pattern recognition. The necessary characterisctics for a material 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 photorefractive polymers reported to date are based on guest-host polymer composite, which normally consist of four components (photoconducting polymer host, NLOchromophore, plasticizer and photosensitizer). We have synthesized and reported various photoconducting polymer based on heteroaromaticdoner moiety like Carbazole and indole. It was shown that polymethacrylates containing the carbazole ring as a side chain has excellent EO property and moderate photoconductivity. Indole is another heteroaromatic molecule which is easily available from coal-tar and has doner moiety like carbazole. Indole, the heteroaromatic structure like Carbazole was designed to work as photoconducting moiety as well as electron doner. Indole was adopted over Carbazole for this purpose, because indole provides better poling efficiency owing to the more compact size compared with Carbazole. Indole has also good thermal and mechanical properties. Indole has good doner moiety like Carbazole and easily formed C.T Complex with TNF or crystal violet and forming hole that will migrate the polymer chain (charge transporting media). It is known that photon absorption by polymer Can generate charge Carriers under external electric field and suitable carrier injectors. Polymeric organic photoconductor mostly follow hopping mechanism of conduction. The hopping mechanism is well dependent on structural sequence and regularity of the polymer.