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PEGylated tetra(aniline) ABA triblock structure PEG-TANI-PEG ( 2 ) consisting of tetra(aniline) (TANI) and polyethylene glycol (PEG) was synthesized by coupling the tosylated-PEG to boc-protected NH 2 /NH 2  TANI ( 1 ) through a simple nucleophilic substitution reaction. Deprotection of  2  resulted in a leucoemeraldine base state of TANI ( 2 -LEB), which was oxidized to stable emeraldine base ( 2 -EB) state.  2 -EB was doped with 1 M HCl to emeraldine salt ( 2 -ES) state. FTIR,  1 H and  13 C NMR and UV-Vis-NIR spectroscopy, and MS (ESI) was used for structural characterization. The synthesized triblock structure exhibited good electroactivity as confirmed by CV and UV-Vis-NIR spectroscopy. Self-assembling of the triblock structure in aqueous medium was assessed by DLS, TEM, and SEM. Spherical aggregates were observed with variable sizes depicting the effect of concentration and oxidation of  2 -LEB. Further, the aggregates showed acid/base sensitivity as evaluated by doping and dedoping of  2 -EB with 1 M HCl and 1 M NH 4 OH, respectively. Future applications in drug delivery and sensors are envisaged for such tunable self-assembled nanostructures in aqueous media.

Tunable Self-Assembled Nanostructures of Electroactive PEGylated Tetra(Aniline) Based ABA Triblock Structures in Aqueous Medium