Sulfonated octa‐substituted Co(II) phthalocyanines immobilized on silica matrix as catalyst for Thiuram E synthesis

Silica nanoparticles were obtained during the work according to two different sol–gel methods. In first one Schtrober's technique and series of cobalt phthalocyanine metal complexes varying in peripheral substituents were used. Second method was performed using the same complexes but differed in applying surface‐active substance (SAS) and two precursors – tetraethoxysilane (TEOS) and aminopropyltrimethoxysilane (APTMOS). All obtained hybrid materials were analyzed via SEM, the size of single particle was studied, which in all cases was about 200 nm. In order to investigate hybrid's characteristics laser diffraction and liquid nitrogen adsorption methods were applied. Distinction in pore's specific volume of differently‐obtained nanoparticles was found. Catalytic activity of all obtained materials were tested in conversion of N,N‐diethylcarbamodithiolate to thiuram E. Effect of peripherally substituted phthalocyanines and morphology of matrixes were manifested on catalytic activity of the hybrids. Cobalt phthtlocyanine complexes are immobilized into a silica matrix in order to obtain catalyst of high efficiency for oxidation of mercaptanes to disulfides. Two types of matrix are used. First one is common silica matrix derived from tetraethoxysilane according to sol‐gel method. Second matrix is based on two precursors containing hydroxyl‐ and amino‐groups. Morphology is studied by SEM, BET and dynamic light dispersion techniques. Catalytic activity of resulting hybrid materials is demonstrated on example of oxidation of sodium diethyldithiocarbamate to thiuram E exhibiting high yields.