Synthesis and Spectral Characterization of Cross Linked Rigid Structured Schiff Base Polymers: Effect of Substituent Position Changes on Optical, Electrical, and Thermal Properties

Three Schiff base diol monomers were oxidatively polymerized with NaOCl as an oxidant. The structures of the monomers and polymers were confirmed by various spectroscopic techniques. Conductivity of the iodine doped polymers measured was compared based on the total charges on imine nitrogen calculated by Huckel method. The polymers were having quite lower band gap than the monomers. Fluorescence spectra of monomers and polymers showed that the excitation and emission maxima centered in the region 362–400 nm and 467–513 nm with large stokes shift. High carbine residue, around 50% at 800°C confirmed that the polymers were having good thermal stability.