A Novel Naphthalene Polymer Based on the 1, 3, 5 -Triazines

Naphthalene diimide-based polymers used as acceptors in organic photovoltaic cells due to their perfect thermal, chemical, and photochemical stability and high electron affinity. In the present study, a novel naphthalene polymer (TANPI) was synthesized by polycondensation of 1,4,5,8-naphthalene tetracarboxylic dianhydride (NDA) with hindered aromatic diamine, 2,4-diamino-6-phenyl-1,3,5-triazine in isoquinoline and m-cresol solvents mixture and under argon atmosphere. The synthesized product purity was confirmed using elemental analysis, IR and UV-vis spectroscopy. The product TANPI is soluble mainly in polar solvents such as pyridine, NMP, DMF, DMSO, m-cresol and TFAC in brown colour. The product was insoluble in polar protic solvents such ethanol and methanol. The optical properties for the polymer were investigated using absorption and emission spectrophotometric measurements. Observed different properties indicate different intermolecular interactions in different solvent which can be important in photonic applications. It is important to note that, excimer emission were observed in pyridine, NMP, DMF, DMSO, m-cresol and TFAC with long Stoke Shifts. Fluorescence quantum yields in different solvents were determined using anthracene in ethanol as standard (NMP: 2%, DMF: 5% and DMSO: 1%). Keywords: Naphthalene polymers, hindered diamine, photonics, solar cells.