Executive Summary : | "Fluorescent π-conjugated molecules are contributing immensely for making optoelectronic devices, dye sensitized solar cells, sensory materials and so on. However the heteroatom doping or chelation of heteroatom to a conjugated organic molecules results in the fine tuning of photophysical properties. In this context the conjugated organoboron compounds are found to be more efficient as it has found profound application in OLEDs, TADF materials, NLO materials and so on.In the conjugated organoboron compounds, significant delocalization occurs to the boron centre due to presence of empty p-orbital of boron atom. Several heterocycles like substituted pyridine, imidazole and pyrazole are used as ligands for boron complexation and their photophysical studies have been explored. Researchers are continuously searching the conjugated organoboron compounds to improve stability and device performance. Imidazo[1,2-a]pyridine based molecules are mostly studied as drugs and less attention has been given for making boron compounds. In the present proposal we have planned to synthesize imidazo[1,2-a]pyridine based boron complexes and study their optical, sensing and OLEDs applications.
Present proposal will be done in three phases. Initially, imidazo[1,2-a]pyridine based different ligands will be synthesized using commercially available starting materials such as 2-aminopyridine, I2 and different acetophenones. Further complexation will be done to make two boron complexes via electrophilic borylation approach using BBr3 and PhMgBr. In an another approach using Buchwald-Hartwig coupling two more ligands phenothiazine and phenoxazine based imidazo[1,2-a]pyridine will be prepared. This will be followed by making boron complexes using the same procedure as mentioned previously. These synthesized ligands will be fully chracterised using different techniques such as NMR, X-ray, HRMS and elemental analysis. In the next phase the photophysical properties will be investigated using UV-Visible spectrometer and fluorimetre. Thermal properties of these complexes will be studied using TGA and DSC. Using cyclic voltammetry experiment, the electrochemical properties will be studied. In the final phase the detection of nitroaromatics such as picric acid and TNT will be done. At last electroluminescent properties will be investigated by fabricating OLEDs device using these complexes." |