Functional metal‐porphyrazine derivatives and their polymers, 3. Catalytic activity of Fe(III)‐3,4,3′,4′,3″,4″,3″′,4″′‐octacarboxyphthalocyanine for decomposition of hydrogen peroxide

Abstract

The decomposition reaction of hydrogen peroxide was carried out by using Fe(II1)-3,4,3 ',4',3 ",4'~,3"',4"'-octacarboxyphthalocyanine (Fe(II1)-oaPc) as a catalyst, which has previously been reported by Boston et al. Fe(II1)-oaPc is a remarkably effective catalyst for the reaction, compared with hemin, other metal-phthalocyanine compounds, or other iron complexes such as [Fe(III)-(bipy),]X,. The kinetics of this reaction was also investigated in the pH range 5 3 -10,5 by measuring the initial velocity, V,, of the increasing concentration of 0, using a Warburg respirometer. The reaction proceeds according the catalase-like mechanism. On the basis of the results of Sigel et al., the reaction mechanism is discussed.

Preparation of a thermosensitive cobalt phthalocyanine/N-isopropylacrylamide copolymer and its catalytic activity on thiol

“…Metallophthalocyanines (MtPc) have attracted considerable attention as oxidation catalysts because of tetra N -donor macrocyclic structural similarity to the naturally occurring metalloporphyrins, their chemical and thermal stability, and their rather cheap and easy preparation on a large scale [1][2][3][4][5][6], whereas they have the following problems: low solubility, high aggregation tendency, and difficulty in catalyst recovery and recycling [7,8]. Strategies of immobilizing MtPc on multifarious insoluble supports, such as zeolites, activated charcoal, and clays, have been introduced to prepare polymeric phthalocyanine catalysts, facilitate catalyst separation and recycling, and reduce effluent contamination [9][10][11][12][13].…”

Electrochemical characterisation of tetra- and octa-substituted oxo(phthalocyaninato)titanium(IV) complexes

“…However, the 3rd reduction does not follow the same trend for all the complexes. Of the octa-substituted complexes, 9d is expected to be more difficult to reduce than 9b and 9c due to the electron donating nature of the tert-butylphenoxy substituents, as was the case for Table 2 List of redox potentials for complexes 5a-5d, 6a-6d and 9b-9d in DMF containing TBABF 4 the corresponding tetra-substituted complexes (5d and 6d compared to 5a-c and 6a-c, respectively). However, the three (9c-d) complexes have about the same 1st reduction potentials.…”

“…Phthalocyanines have attracted a great deal of attention due to their intense colour and diverse redox chemistry associated with both the 18 electron system of the phthalocyanine (Pc) ring and the central metal atom. The high chemical inertness and thermal stability of MPcs have led to the exploration of their technological utility as industrial dyes, catalysts [4], in gas diffusion electrodes [5], as biosensors [6], as photosensitizers for photodynamic therapy of cancer [7][8][9] and in non-linear optics [10,11].…”

Synthesis and selected properties of metallo and metal-free 2,3,9,10,16,17,23,24 –octacarboxyphthalocyanines

“…65 Iron octacarboxyphthalocyanine shows catalytic activity in the decomposition of hydrogen peroxide which can be defined by measuring the initial rate of the reaction (V 0 ) against the increasing concentration of oxygen. 55 The reaction proceeds according to the catalase-like mechanism. The rate of decomposition depends on the central metal of octacarboxyphthalocyanine.…”