Cobalt tetrasulfonated phthalocyanine

Castellani, A. M. Goncalves, J. E. Gushikem, Y. The use of carbon paste electrodes modified with cobalt tetrasulfonated phthalocyanine adsorbed in silica/titania for the reduction of oxygen. Journal of New Materials for Electrochemical Systems (2002) 5(3) 169-172. 

Zilbermann, I., J. Hayon, T. Katchalski, R. Ydgar, J. Rishpon, A.I. Shames, E. Korin, and A. Bettelheim (2000). Spectroscopic and electrochemical characterization of the interaction of nitrogen monoxide and cobalt tetrasulfonated phthalocyanine in aqueous solutions and surfactant films. Inorg. Chim. Acta, 305, 53-60. 

Since pyrrole and its derivatives form very stable conducting surfaces, Za-gal, Bedioui, and coworkers used ultramicro-carbon-fiber electrode modified with polypyrrole-dopped cobalt-tetrasulfonated phthalocyanine for the electrocatalytic oxidation of 2-ME The resulting electrode was stable and showed a detection limit of 8 10 M. Pyrolle substituted phthalocyanines have been used for the analysis of cysteine. Electrocatalytic behavior of MPc complexes has also been examined under homogeneous conditions. Water soluble OMo (OH)TSPc catalyzed the oxidation of cysteine under homogeneous conditions. ... 

Figure 35. Model proposed by Nikolic, Adzic and Yeager for adsorbed iron and cobalt tetrasulfonated phthalocyanines on the basal plane of stress annealed pyrolytic graphite, a, View parallel to the surface b, view perpendicular to the surface.

Cobalt Tetrasulfonate Phthalocyanine (CoTSPc)-Modified Electrode... 

In another approach, a DO sensor was proposed by modifying a glassy carbon (GC) electrode with cobalt tetrasulfonate phthalocyanine (CoTSPc). The direct reduction of oxygen at a solid electrode is a slow process and also requires a high negative potential which can be lowered by electron transfer mediators that can shuttle the electrons between oxygen and electrode. Among these mediators, phthalocyanines acquired a lot of attention because of their catalytic ability and... 

Fig. 5.120. MCD (top) and conventional UV-Vis spectra of an aqueous solution of 10 M tetrasulfonated cobalt(III)phthalocyanine in 0.05 M H2SO4, H = 1.1 T, based on data in [660]...

Bettelheim et al. investigated nitrosyl adducts of cobalt tetrasulfonated ph-thalocyanine, Co(TSPc) , dissolved in aqueous solution or incorporated into a DDAB surfactant film where Co(TSPc)" acts as the counterion for four DDA+ forming Co(TSPc)(DDA)4 (this was also done with dodecyltrimethylam-monium) " . Using FTIK and electrochemical experiments the conformational orientation of the NO adduct was determined to be bent, Eq. (4.33). When exposing the phthalocyanin to NO in solution, a sharp band at 1,646 cm appears but is quickly replaced by a broader band at about 1,700 cm implicit of the N-Co bond shortening, this also occurs for the solid form of Co(TSPc) and Co(TSPc)(DDA)4, Eq. (4.34). A plot of E v. l/[NO], using CV, yielded a slope of 65 mV, ruling out the possibility of a Co(TSPc)(NO)2, complex. 

In another report using the CDC approach, functional modulation was achieved by controlling LbL film but without a specific biomolecule. In order to achieve this goal, Luz and co-workers [8] assembled two LbL platforms that take advantage of alternate immobilization of cobalt (II) tetrasulfonated phthalocyanine (Co TsPc), chitosan (Chit) and SWCNTs. Co TsPc belongs to a group of metallic phthalo-cyanines that show delocalized 7t-electrons and planar geometry with unique... 

Santos WJR, Sousa AL, Luz RCS et al (2006) Amperometric sensor for nitrite using a glassy carbon electrode modified with alternating layers of ironflll) tetra-(lV-methyl-4-pyridyl)-porph5oin and cobalt(II) tetrasulfonated phthalocyanine. Talanta 70 588-594... 

Silva J, Griveau S, Richard C, Zagal J, Bedioui F (2007) Glassy carbon electrodes modified with single walled carbon nanotubes and cobalt phthalocyanine and nickel tetrasulfonated phthalocyanine highly stable new hybrids with enhaneed electrocatalytic performances. Electrochem Commun 9 1629-1634... 

The cobalt(II)15 and zinc(II)16 complexes of phthalocyanine(Pc), octcyano-Pc, and tetrasulfon-ato-Pc incorporated in poly(4-vinylpyridine-co-styrene) or Nafion films coated on graphite have also been examined as catalytic devices for dihydrogen electrogeneration in phosphate buffer. These catalytic systems were strongly suggested to be dominated by the electron transfer within the polymer matrix. The best catalytic film is that constituted of the nonsubstituted Con-Pc complex in poly(4-vinylpyridine-co-styrene), giving a turnover number of 2 x 10s h-1 at an applied potential of —0.90 V vs. Ag Ag Cl. 

Transition metal compounds, such as organic macrocycles, are known to be good electrocatalysts for oxygen reduction. Furthermore, they are inactive for alcohol oxidation. Different phthalocyanines and porphyrins of iron and cobalt were thus dispersed in an electron-conducting polymer (polyaniline, polypyrrole) acting as a conducting matrix, either in the form of a tetrasulfonated counter anion or linked to... 

Autoxidation reactions of organic compounds are quite widespread and Co(lll) is among the most generally active metal ions serving as a catalyst in such reactions [36]. Cobalt—phthalocyanine tetrasulfonate bound cationic latexes have been... 

Chemicals Phthalocyanine-2,9,16,23-tetracarboxylic acid cobalt(II) complex 1 (R = -COOH) (see Experiment 5-11, Section 5.4), phthalocyanine-2,9,16,23-tetrasulfonic acid aluminium(III) complex 1 (R = -SOjH) (see Experiment 5-13, Section 5.4) Ludox As 40 (Aldrich, 40wt.% colloidal silica in water) tetraethylammonium hydroxide (TEAOH) pol) ropylene vessel cetyl-trimethylammonium chloride (CTAC) ethanol. 

Nykong et al. have also smdied a variety of cobalt containing macrocycles. The electrocatalytic properties of cyanocobalamin adsorbed onto GCEs in aqueous solution was examined Along with adsorbed cobalt(II) tetrasulfonated ph-thalocyanine (Co(TSPc)) ", adsorbed cobalt phthalocyanine is examined (CoPc) in DMSO ". The proposed mechanism invokes both a ring- and metal-centered reduction during NO catalysis, Eqs. (4.35)-(4.39). 

Zagal, J.H., C. Fierro, and R. Rozas (1981). Electrocatalytic effects of adsorbed cobalt phthalocyanine tetrasulfonate in the anodic oxidation of cysteine. J. Electroanal. Chem. 119(2), 403-408. 

Automated methods based on MN4 macrocyclic compounds have been developed for electroanalytical applications. Sun et al. [130] produced a multilayer film containing cobalt phthalocyanine that was assembled on the surface of a quartz slide and gold electrode by alternating deposition of water-soluble cobalt phthalocyanine tetrasulfonate (CoTsPc) and a bipolar pyridine salt (PyCfBPCoay). The electrode modified with the multilayered film showed an excellent electro-catalytic response for the oxidation of hydrazine. Hydrazine was detected by flow... 

The conversion of sulfur mustard (1) to divinyl sulfide (4) has been known since the 1920 s [44] and has been recently reported again to occur on treatment of 1 with superoxide in the presence of cobalt(II) tetrasulfonated tetraamino phthalocyanine complexes [53],... 

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