Oxidation of Cobalt(II) Tetraphenylporphyrinate with Molecular Oxygen

Tatyana, M Ziyadova; Vladimir, A Burmistrov; Alexandr, S Semeikin; Oskar, I Koifman

doi:10.6060/mhc140926z

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…In all these cases, by adsorption, Co(II)TPP suffers a strong interaction between metallic oxide and the porphyrin ring, like an isoenergetic electron transfer from porphyrin to the metallic oxide conduction band. By supporting on these metallic oxides, the new oxidized forms of Co-TPP could appear [21]. Vanillin formation from Kraft-lignin is a favorable reaction, because vanillin and its derivatives are widely used in perfumery and in pharmaceutical applications and also because Kraft-lignin is a by-product in the industrial preparation of pulp and paper.…”

Section: Degradation Of Kraft-ligninmentioning

confidence: 99%

Porphyrins and Phthalocyanines: Photosensitizers and Photocatalysts

Ion¹

2017

Phthalocyanines and Some Current Applications

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The porphyrins and phthalocyanines are among the most representative macrocycles in synthetic chemistry, characterized by specific molecular structures, responsible and associated with their particular properties. They have high versatility and an adequate variability introduced either by macrocycle metallation or by different substituents at its periphery called meso-substituents. The porphyrins could find, together with the synthetic phthalocyanines, various scientific and technological applications in chemical and photochemical areas. They can serve as catalysts and photocatalysts in different reactions, or as photosensitizers in photodynamic therapy of cancer, due to their high efficiency to generate free radicals and excited state species. The aim of this chapter is to achieve a better understanding of the complex and various properties of the porphyrins and phthalocyanines in different solvents or in heterogeneous media, trying to draw the relationships between these topics with their possible applications in catalytic, photocatalytic area (photodegradation of Kraft-lignin, photooxidation of different unsaturated hydrocarbons, photodegradation of different organic aquatic pollutants, oxirans polymerization) and some preliminary results about the heterogeneous porphyrin sensitizers in the photodynamic therapy area. Their photobleaching mechanisms in different conditions are also discussed.

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Section: Degradation Of Kraft-ligninmentioning

confidence: 99%

Porphyrins and Phthalocyanines: Photosensitizers and Photocatalysts

Ion¹

2017

Phthalocyanines and Some Current Applications

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“…The importance of metalloporphyrins is great in the photodynamic therapy of cancer [6–8] and the disinfection of pathogenic viruses [8] . Metal complexes of synthetic macroheterocycles are widely used as pigments [8,9] and catalysts [10–12] . Recently, new promising directions for the use of macroheterocyclic metal complexes in supramolecular chemistry, [13,14] for the induction of spiral liquid‐crystalline phases [15,16] and as stationary phases for chromatography [17–19] have appeared.…”

Section: Introductionmentioning

confidence: 99%

Push‐Pull Effect at Formation of Sitting‐Atop Metal‐Porphyrin Complex in Solvating Media: H‐Bonding and Electrostatic Repulsion

et al. 2022

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This work presents the results of experimental and theoretical studies of the solvation effects on the kinetics of the porphyrins reaction with zinc and cadmium acetate, the structure and characteristics of the intermediate ‐ sitting‐atop (SAT) complex. Kinetic rate constants of metal complexes of tetra‐p‐substituted tetraphenylporphins formation in binary solutions with a regulated solvating ability were obtained. Extreme dependences of the rate constants on the solvent composition were found. The acceleration of the reaction was shown to be observed with an enhancement of the electron‐donating properties of the substituent. These data indicate the formation of the SAT complex as limiting stage. The structure and energy parameters of porphin‐zinc SAT complexes and its solvates were studied by DFT method using B3LYP and long range corrected CAM‐B3LYP hybrid functionals. A significant distortion of the porphin structure during the formation of an intermediate and its solvation was ascertained. The influence of these processes on structural and energy changes was founded to be the consequence of push‐pull effect due to the repulsion of NH hydrogen atoms by a metal ion (push) and stretching of these bonds (pull) during the formation of H‐bonds.

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