Kinetics of cysteine autoxidation catalyzed by cobalt (II) tetrasulfophalocyanine

Kozlyak, E. I.; Erokhin, A. S.; Yatsimirskii, A. K.

doi:10.1007/bf02066709

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…Regarding the substrate concentrations, two different sets of kinetic features were observed. For substrates that contain alkyl groups (EtOCSSK, (EtO) 2 PSSK, Et 2 NCSSNa, CH 3 COSK, cysteine [24] and also for HS − and S 2− [26]), the Michaelis-type curves were obtained in a similar thiolate concentration range as for Reaction 2 (Fig. 13A) yielding the following kinetic equation:…”

Section: Validation Of the Anaerobic Reaction Being A Subset Of The Mmentioning

confidence: 99%

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Kinetic and binding studies of the thiolate–cobalt tetrasulfophthalocyanine anaerobic reaction as a subset of the Merox process

Tyapochkin¹,

Kozliak²

2005

Journal of Molecular Catalysis A: Chemical

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Section: Validation Of the Anaerobic Reaction Being A Subset Of The Mmentioning

confidence: 99%

“…In addition, aggregation was thoroughly investigated only for Co II TSPc but not for its thiolate complexes. Another poorly explored topic is the potential involvement of the second thiolate molecule in the formation of the ternary RS − -CoTSPc-O 2 complex in Scheme 1, as some studies have indicated [10,[23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Kinetic and binding studies of the thiolate–cobalt tetrasulfophthalocyanine anaerobic reaction as a subset of the Merox process

Tyapochkin¹,

Kozliak²

2005

Journal of Molecular Catalysis A: Chemical

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“…Possible deviation from the straightness is caused by decreasing of concentration C B°. Equation 18 is linear in coordinates Lineweaver-Burk [37];…”

Section: Catalytic Properties Of Cotspc1 and Cotspc2mentioning

confidence: 99%

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

Вашурин

Filippova

Znoyko

et al. 2015

J. Porphyrins Phthalocyanines

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Novel complexes of cobalt(II) with sulfonated derivatives of phthalocyanines are synthesized. The influence of the sulfonated group's 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.

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UV-vis and Binding Studies of Cobalt Tetrasulfophthalocyanine–Thiolate Complexes as Intermediates of the Merox Process

Navid

Tyapochkin

Archer

et al. 1999

J. Porphyrins Phthalocyanines

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Intermediates of the cobalt tetrasulfophthalocyanine ( CoTSPc )-catalyzed thiol autoxidation were studied by UV-vis spectroscopy. All thiolates react with CoTSPc resulting in the formation of 1:1 complexes. Three major factors control both the stability and aggregation of the complexes: thiolate basicity, metal-to-ligand charge transfer (MLCT) and π stacking. Basic thiolates partially reduce C oII TSPc , whereas CoTSPc complexes with low-basicity aliphatic thiolates ( p K a < 4) do not exhibit Co (II) reduction, based on the absence of the characteristic Co (I) charge transfer band at 450 nm. CoTSPc complexes with aliphatic and bulky aromatic thiolates appear to be aggregated in aqueous solutions and are characterized by a broad band at 650 nm. Non-bulky aromatic thiolates of low basicity ( p K a < 6) form unique stable monomeric Co II TSPc complexes. This unique spectral feature can be attributed to π stacking between the phthalocyanine ring and thiolate. Comparison of binding constants shows that the partial reduction of Co (II) significantly contributes to the thiolate binding. A combination of aromatic π stacking and MLCT appears to be responsible for the observed 1000-fold stronger binding of non-basic aromatic thiolates as compared with aliphatic ligands of similar basicity. Kinetic studies confirm the importance of the thiolate binding type for catalysis.

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Kinetics of cysteine autoxidation catalyzed by cobalt (II) tetrasulfophalocyanine

Cited by 10 publications

References 4 publications

Kinetic and binding studies of the thiolate–cobalt tetrasulfophthalocyanine anaerobic reaction as a subset of the Merox process

Kinetic and binding studies of the thiolate–cobalt tetrasulfophthalocyanine anaerobic reaction as a subset of the Merox process

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

UV-vis and Binding Studies of Cobalt Tetrasulfophthalocyanine–Thiolate Complexes as Intermediates of the Merox Process

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