Redox potentials of metal phthalocyanines in non-aqueous media

Lever, Annabelle; Wilshire, J. P.

doi:10.1139/v76-356

Cited by 100 publications

(38 citation statements)

References 10 publications

(10 reference statements)

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“…Therefore, in contrast to Zn II OHETPc, it was not possible to observe the oxidation of H 2 OHETPc, which probably occurs at a more positive potential than the solvent-limited potential in the experimental conditions of our work. The electrochemistry of cobalt(II) phthalocyanines is split into two sections, that referring to donor solvents and that referring to non-donor solvents [26][27][28][29]. Whether the metal or the ring is oxidized first depending on the nature of the solvent is the principle difference for the redox couples of cobalt(II) phthalocyanines.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical properties of octakis(hydroxyethylthio)-substituted phthalocyanines

Özkaya

Hamuryudan

Bayır

et al. 2000

J. Porphyrins Phthalocyanines

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Cyclic voltammetry of octakis(hydroxyethylthio)-substituted phthalocyanines with 2 H ( H 2 OHETPc ), Zn (II) ( Zn II OHETPc (−2)) and Co (II) ( Co II( OHETPc (−2)) in the phthalocyanine core has been investigated in dimethylsulfoxide ( DMSO ), and some of the results were evaluated together with their absorption spectra in the visible range. The redox processes due to both aggregated and non-aggregated species were observed on the voltammograms of phthalocyanines with Zn (II). The effect of chloride ion on the cyclic voltammetry of Co II OHETPc (−2) has been investigated in the DMSO / ClO 4− couple. The comparison of cyclic voltammetry for Co II OHETPc in the absence and presence of chloride ion showed that chloride ion does not bind to either Co (II) or Co (I) but does bind very strongly to Co (III). The detailed electrochemistry of Co II OHETPc (−2) was investigated in terms of the Co (I)/ Co (II) and Co (II)/ Co (III) redox couples, and various equilibria related to the species coordinated to Co (II) and Co (III) in the phthalocyanine core.

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Section: Resultsmentioning

confidence: 99%

Electrochemical properties of octakis(hydroxyethylthio)-substituted phthalocyanines

Özkaya

Hamuryudan

Bayır

et al. 2000

J. Porphyrins Phthalocyanines

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“…Das Reduktionspotential des Kobalt(1)-phthalocyanins von -0.37V37) ist bereits ziemlich positiv und liegt weit unter den Reduktionspotentialen sowohl ahnlicher Metall(1)-phthalocyanine ( -0.77 bis -1 .12V) 37,38), als auch anderer strukturverwandter Kobalt(1)-komplexe, wie dem Vitamin BIZ, den Porphyrinen und Cobaloximen ( -1 .O bis -1 .2V)38946947). Diese auRerst milde Reduktionskraft in Verbindung mit seiner S~pernukleophilie~~) lassen das Kobalt(1)-phthalocyanin als Spaltreagens als am geeignetsten erscheinen.…”

Section: Balt(iii)-phthalocyanine4) Aunerdem Ist Es Befahigt (2-benunclassified

Fragmentierungen mit Supernukleophilen, VIII Spaltung ß‐halogenierter Urethane mit Kobalt(I)‐phthalocyanin; eine neue Schutzgruppentechnik für Peptid‐Synthesen

Eckert

Ugi

1979

Liebigs Ann. Chem.

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Eine neue Schutzgruppentechnik unter Verwendung von (I-Halogenalkoxycarbonyl-Gruppen wird vorgestellt und ihre Nutzlichkeit anhand zweier Peptidsynthesen bewiesen. Die Abspaltung der Schutzgruppen erfolgt selektiv mit supernukleophilem Kobalt(1)-phthalocyanin uber einen Alkylierungs-, Fragmentierungsmechanismus unter sehr schonenden Bedingungen. Fragmentations with Supernucleophiles, VIII'). -Cleavage of P-Halogenated Urethanes by Cobalt(1)-phthalocyanine; a New Amino Protecting Group Technique for Peptide Syntheses**)A new protecting group technique, using p-haloalkoxycarbonyl groups is presented and tested in two peptide syntheses. These protection groups are removed selectively and under mild conditions by the supernucleophilic cobalt(])-phthalocyanine. The mechanism of this reaction consists in an alkylation step, followed by fragmentation.

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“…These highly stable systems formed in nature gain their universality from a central metal site coupled to several connected pyrrole rings [52]. Metalloporphyrins, with Fe in different oxidation states, can easily undergo redox reactions in living systems and activate many biochemical reactions [53,54]. They could be used as matrices for hydrogen storage [55] and optical devices [56,57].…”

Section: Introductionmentioning

confidence: 99%