Polyamides offer excellent physical and chemical properties, thermal and oxidative stability, flame resistance, and superior mechanical and dielectric properties (1). However, for many applications polyamides need to have good film-forming ability and adequate organo solubility. In order to achieve these requirements, structural modifications of polyamides often became essential (2). The objective of this study was two folds: synthesis and characterization of new diamines bearing particular functional groups for optical and antibacterial activity such as imidazole and xanthene moieties and its use in preparation of corresponding polyamides. these diamines were condensed directly with aliphatic and aromatic diacids via the Yamazaki–Higashi phosphorylation method in the presence of triphenylphosphite (TPP), pyridine (Py) and halide salt to give high molecular polyamides (Scheme 1). The synthesized PAs were obtained in quantitative yields with inherent viscosities between 0.51 and 0.87 dL/g. The structures of diamines and PAs were characterized by elemental analysis, FT-IR and NMR spectroscopy,and properties of PAs were investigated by using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and UV–visible and fluorescence spectroscopy. The PAs showed good solubility in aprotic and polar organic solvents, with high thermal stability. these compounds exhibited good antibacterial activity and can be further developed for application as effective antimicrobial agent
