This is the first report on the polymerization of aniline by using water-soluble transition-metal tetrasulfonated phthalocyanine (TSPc). The polymerization per-formed at the presence of the sulfonated polystyrene as a template and water-soluble, conducting polyanifine (PANI) was obtained. The reactions were carried out with different catalysts, such as iron, cobalt and manganese phthalocyanine. For Fe-TSPc, the yield and rate of polymerization of aniline are highest compared to other methallo phthalocyanine. The reactions carried out with different pH, monomer, catalyst, template and initiator concentrations and the best conditions are reported. The formation of conducting and electroactive form of the polyaniline was confirmed through UV-vis and FT-IR spectroscopy, four-point probe conductivity measurements and cyclic voltammetry. (c) 2007 Elsevier B.V. All rights reserved.