Alena Voronina

A new water-soluble sulfonated cobalt(II) phthalocyanines: Synthesis, spectral, coordination and catalytic properties

Novel complexes of cobalt(II) with sulfonated derivatives of phthalocyanines are synthesized. The influence of the sulfonated groups number in peripheral substituent on solubility of macrocycle and ability to form ordered structures in solution is showed. Transition from H-aggregates to monomeric phthalocyanine structures and sandwich-type dimers was found during formation of metallophthalocyanine complexes with 1,4-diazabicyclo(2.2.2)octane. The catalytic activity of metallophthalocyanines was studied on the model of Merox process.

Novel aqueous soluble cobalt(II) phthalocyanines of tetracarboxyl-substituted: Synthesis and catalytic activity on oxidation of sodium diethyldithiocarbamate

Enhancement of the catalytic activity of phthalocyanine catalysts by immobilizing them on polymer matrix has been studied. It has been found that the immobilization of cobalt(II) phthalocyanines on polymers enhances their catalytic activity in the oxidation of sodium diethyldithiocarbamate by air oxygen under mild conditions.

Self-Association of Sulfo Derivatives of Cobalt Phthalocyanine in Aqueous Solution

Sulfo derivatives of cobalt phthalocyanine containing naphthalene fragments have been synthesized, and their self-association and molecular complexation with pyridine in aqueous solution have been studied by spectrophotometry. The dissociation constants of the dimeric associates have been determined. The effects of the number of functional groups in the peripheral substituents and of the axial ligand on the phthalocyanine dimerization process have been revealed.

Effect of the solvation properties of the solvent on the formation of associated structures of water-soluble Co(II) phthalocyanines

Self-association processes of sulfonated cobalt phthalocyanine derivatives were studied. The effects of the size of peripheral substituent and the solvation properties of the solvent on the formation of H- and J-aggregates of metal phthalocyanines were demonstrated. The possibility to control the associative equilibrium of metal phthalocyanines via coordination to DABCO was established. The introduction of DABCO was found to induce dissociation of H- and J-aggregates followed by the formation of sandwich type dimers.

Self-association of sulfo derivatives of cobalt phthalocyaninates in the presence of 1,4-diazabicyclo[2.2.2]octane

Complex formation between water-soluble cobalt(II) phthalocyaninates and 1,4-diazabicyclo[2.2.2]-octane has been studied. The formation of the 1: 1 molecular complex and the 2: 1 sandwich-type dimers has been confirmed. The sandwich-type dimers and the J-aggregates involving the peripheral groups of the macrocycle are formed in ethanol medium. Stability constants of the molecular complexes have been determined, and the effect of size of the peripheral substituents on the dimeric structures stability has been elucidated.

Sulfonated Co(II) phthalocyanines covalently anchored at organic polymers as catalyst for mild oxidation of mercaptans

Current work is devoted to covalent immobilization of sulfonated derivatives of cobalt phthalocyanines “Merox catalysts” on the surfaces of polypropylene and polyethylene terephthalate. Their catalytic activity in reaction of mild oxidation of sulfur compounds to disulfides with oxygen of the air was studied. Anchoring of the catalyst on this polymer prevents its leaching and promotes its efficient recovering and recycling without significant loss of catalytic activity.

Self-assembling systems based on metallophthalocyanines and nitrogen-containing ligands

Association of sulfonated derivatives of cobalt phthalocyaninate in solutions in the presence of nitrogen-containing organic ligands is studied. Ligand denticity and spatial structure are found to be the main factors controlling the association equilibrium between sulfonated metallophthalocyanines.