Synthesis and characterization of cobalt phthalocyanines covalently attached to silica

Novel Bifunctional Catalysts of Cobalt Phthalocyanine Bonded to Organic-Functionalized Basic Calcined Mg–Al Hydrotalcite for Autoxidation of Mercaptans

Two novel bifunctional catalysts, cobalt(II) 2,9,16,23-tetraaminophthalocyanine CoPc(NH2)4 bound to basic calcined Mg–Al hydrotalcite (Mg/Al=3:1) modified with organic functional groups by complexation and by covalent linkage, respectively, have been found to exhibit higher catalytic activity and stability in 1-octanethiol autoxidation than the corresponding supported CoPc(NH2)4 catalyst under equivalent reaction conditions.

Catalytic Properties of Cobalt Phthalocyanines Chemically Bonded to Polymer Anchored onto Silochrome Surface

Catalytic systems consisting of cobalt phthalocyanine grafted to maleic anhydride-styrene copolymer chemically linked with γ-aminopropylated silochrome have been prepared. In the process of sulfide oxidation with air oxygen the specific catalytic activity of these systems depends strongly on the phthalocyanine concentration in the catalyst. At low phthalocyanine concentrations (below 0.4 × 10−6 mol g−1) the catalytic activity is more than an order of magnitude larger than that of homogeneous catalysts and cobalt phthalocyanine adsorbed on a silochrome surface. The different ways of preparing the catalysts are reflected in the kinetic characteristics of the oxidation process.

Synthesis of organo-soluble metallophthalocyanines bearing electron-withdrawing substituents

The syntheses of organo-soluble metallophthalocyanines having sulfo- and sulfonamido- electron-withdrawing substituents are reported. The simple cation exchange of the readily available tetrasodium salt of metallo-sulfophthalocyanines 1( M = Ni , Co , Fe , Cr ) by alkylammonium salts afforded the sulfophthalocyanines 2 and 3 in good yields. Complexes 2 featuring two long C 18 alkyl chains are only soluble in organic solvents while tetrabutylammonium counter ions exhibit a dual solubility in both organic solvents and water for compounds 3. The tetrasulfonamidophthalocyanine complexes 5–7 with four C8, four C18 or eight C8 alkyl chains have been obtained after chlorination of the sulfophthalocyanines 1 leading to the chlorosulfonyl derivatives 4, followed by reaction with various substituted amines. The synthesis of the chromium precursors with tetrasulfo and tetrachlorosulfonyl substituents is also described.

The key role of peripheral substituents in the chemistry of phthalocyanines and their analogs

The preparation and optical properties of peripherally substituted phthalocyanines and their analogs (i.e. naphthalocyanines, anthracyanines, aza-analogs of phthalocyanines, and tetraazaporphyrins) have been widely discussed. This review highlights methodologies that have been published in poorly known and mostly unavailable Russian journals.