The porphyrin-catalyzed, template-guided polymerization of aniline was carried out in an aqueous buffer solution. Hydrogen peroxide and iron(III) tetrasulfonated tetraphenyl porphyrin catalyzed the polymerization of aniline in the presence of sulfonated polystyrene as a template. The polymerization was carried out at different pHs ranging from 1 to 5. Ultraviolet-visible spectroscopy indicated the formation of a conducting form of polyaniline. The extent of the polymerization increased with decreasing pH of the solution. The maximum absorbance of the polaron band at 750 nm was obtained at pH 2, but when the polymerization was performed with pH 4, this band shifted to a longer wavelength. These results confirmed that a longer chain length of polyaniline was obtained with pH 4.

The protonation equilibria of tetrakis(4-sulfonatophenyl)porphyrin sodium salt, Na 4 [H 2 tpps], and its complex formation with Zn 2+ ion in aqueous solutions were studied over a wide range of pH values, (2 to 12), using a combination of spectrophotometric and potentiometric methods at constant temperature, 25 °C, and constant ionic strength (0.1 mol • dm -3 sodium perchlorate). Least squares regression calculations are consistent with the formation of Zn(H 2 O) 2 L, Zn(H 2 O)(OH)L, and Zn(OH) 2 L, species, where L represents tpps 6-. The hydrolysis of zinc ion was also investigated spectrophotometrically in aqueous solution and four hydrolytic species were specified in the mentioned experimental conditions. Finally, the species mole fraction of the hydrolyzed and the complex species were plotted at different pH values and discussed.

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Metallophthalocyanines have been synthesized in a very short time with excellent yields in the presence of tetrabutylammonium bromide ( TBAB ) as an ionic liquid at 185 °C. The ionic liquid can be recycled for subsequent reactions without any appreciable loss of efficiency.