Theoretical study of chain length effect on conjugated length of oligoaniline

In the conducting polymers field, poly aniline (PANI) is one of the most studied substanceduring past few decades, in particular, because of its good environmental stability, costeffectiveness, ease of synthesis, processing and controllable electrical conductivity. Poly(anilin derivatives) have applications in various field of life such as in catalysis, energystorage, battery electrode material, drug-delivery, sensors, solar and fuel cells, supercapacitors, electrochromic-display material and as material for removal of water pollutant[1,2]. Several forms of polyaniline can be obtained by tuning two parameters: the averageoxidation state and the degree of protonation. Polyaniline differs structurally from otherconducting polymers, as its electronic properties depend upon nitrogen hetroatom dopedbetween constitutional phenyl rings in the backbone allowing chemical flexibility to accessseveral oxidation states. The three stable forms of PANI correspond to the leucoemeraldinebase (LB), emeraldine base (EB), pernigraniline base (PNB). The PNB form of PANI hasattracted significant interest because it is the only known polymer besides polyacetylene thatis known to exhibit a two-fold degenerate ground state [3]. In the present work, we study ofchain length effect on