Synthesis and catalytic properties of hybrid materials based on organically modified silica matrix with cobalt phthalocyanine

Hybrid materials with Co(II) phthalocyanine immobilized on organically modified silica matrices were obtained. Morphological characteristics of obtained materials were tested by scanning electron and atomic force microscopy techniques and laser diffraction analysis. Covalent immobilization of catalyst was proved by IR spectroscopy data concerning position and intensity of characteristic vibrations for matrix and phthalocyanine. Synthesized materials were evaluated as catalysts for the oxidation of RSH compounds under the temperature and pH variation. Reaction rate constants and activation parameters were estimated. The value of pH about 10 was found to be optimal for the diethyldithiocarbamate oxidation in the presence of studied catalysts. The changing of the limiting step from kinetic to diffusion was observed at 303.15 K for hybrids with mercaptoalkyl and aminoalkyl substituted matrices.