Electrochemical and catalytic properties of chromium tetraaminophthalocyanine

Obirai, Joe; Nyokong, Tebello

doi:10.1016/j.jelechem.2004.06.026

Cited by 14 publications

(9 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Most studies of electropolymerised MPc have focused on the electrochemical polymerisation of MTAPc complexes. 39,110,[134][135][136][137][138][139][140][141][142] The polymerisation process of these complexes involves the oxidation of the amino group which forms radicals that initiate condensation by attacking phenyl rings of neighbouring molecules. An illustration of a hypothetical polymer coating is given in Fig.…”

Section: Immobilization Of Metallo-macrocycles Adsorption Self Assemb...mentioning

confidence: 99%

Tuning the redox properties of metalloporphyrin- and metallophthalocyanine-based molecular electrodes for the highest electrocatalytic activity in the oxidation of thiols

Bedioui

Griveau

Nyokong

et al. 2007

Phys. Chem. Chem. Phys.

Self Cite

121

View full text Add to dashboard Cite

In this work we discuss different approaches for achieving electrodes modified with N(4) macrocyclic complexes for the catalysis of the electrochemical oxidation of thiols. These approaches involve adsorption, electropolymerization and molecular anchoring using self assembled monolayers. We also discuss the parameters that determine the reactivity of these complexes. Catalytic activity is associated with the nature of the central metal, redox potentials and Hammett parameters of substituents on the ligand. Correlations between catalytic activity (log i at constant E) and the redox potential of catalysts for complexes of Cr, Mn, Fe, Co, Ni and Cu are linear with an increase of activity for more positive redox potentials. For a great variety complexes bearing the same metal center (Co) correlations between log i and E(o') of the Co(II)/Co(I) couple have the shape of an unsymmetric volcano. This indicates that the potential of the Co(II)/Co(I) couple can be tuned using the appropriate ligand to achieve maximum catalytic activity. Maximum activity probably corresponds to a DeltaG of adsorption of the thiol on the Co center equal to zero, and to a coverage of active sites by the thiol equal to 0.5.

show abstract

Section: Immobilization Of Metallo-macrocycles Adsorption Self Assemb...mentioning

confidence: 99%

Tuning the redox properties of metalloporphyrin- and metallophthalocyanine-based molecular electrodes for the highest electrocatalytic activity in the oxidation of thiols

Bedioui

Griveau

Nyokong

et al. 2007

Phys. Chem. Chem. Phys.

Self Cite

121

View full text Add to dashboard Cite

show abstract

“…For these reasons, determination of nitrite has received considerable attention. Many methods have been developed for nitrite determination including spectrophotometry [5], chromatography [6] and electrochemical methods [7][8][9][10][11][12], which are advantageous over the other methods in terms of cost and time.…”

Section: Introductionmentioning

confidence: 99%

An Electrochemical Nitrite Sensor Based on a Multilayer Film of Polyoxometalate

Sahraoui¹,

Chaliaa²,

Maaref³

et al. 2013

JST

View full text Add to dashboard Cite

In this work, we have developed an electrochemical sensor for nitrite detection, based on a polyoxometalate (POM) namely mono-lacunary keggin anion [SiW₁₁O₃₉]^8﹣ cited as (SiW₁₁). Electrochemical characterization of SiW₁₁ shows two-step reduction processes, with formal potentials of ﹣0.5 V (I) and ﹣0.68 V (II). Oppositely charged polyelectrolyte (poly (allylamine hydrochloride) (PAH)) and (SiW₁₁) were assembled alternately to modify glassy carbon electrode. The electrochemical behavior of the modified electrode was studied in detail using cyclic voltammetry (CV). The results showed that SiW₁₁/PAH/GC electrode present good electrocatalytic activity for the reduction of nitrite. The sensor showed a dynamic range from 100 μM to 3.6 mMof nitrite and no interference from other classical anions. Experimental factors that affect electron-transfer rate in these films, such as pH effect and layers number, were systematically analyzed.

show abstract

“…[4,5] Among them chromium phthalocyaninates demonstrate attractive electrochemical behavior and catalytic activity. [6,7] For instance, Obirai et al [7] have demonstrated the catalytic activity of electrosynthesized chromium tetraaminophthalocyanine towards oxidation of nitric oxide and nitrite.…”

Section: Introductionmentioning

confidence: 99%

X-Ray Diffraction Study of Crystal Structure and Thin Films of Chromium(II) Phthalocyaninate

Sukhikh¹,

Klyamer²,

Basova³

2020

MHC

View full text Add to dashboard Cite

Crystal structure of Cr(II) phthalocyaninate (CrPc) was determined by means of single-crystal X-ray diffraction. It was shown that after vacuum sublimation CrPc crystallized as a β-polymorph, which was isostructural to β-polymorphs of other metal phthalocyanines. When deposited onto glass substrate by organic molecular beam deposition, CrPc formed thin films with strong preferred orientation, consisting of α-polymorph. It was shown that both β-CrPc powder and α-CrPc films were unstable in air and transformed to Cr(OH)Pc. X-Ray diffraction (XRD) studies showed that β-CrPc polycrystalline powder after storage in air (relative humidity 20 %) began to exhibit the first signs of degradation already in 1 hour, while the first changes in XRD patterns of α-CrPc films became noticeable only after a few days. Annealing of α-CrPc films at 250 °C in air at a relative humidity of 70 % leads to their faster conversion to Cr(OH)Pc, and the resulting films have a high degree of crystallinity.

show abstract

Electrochemical and catalytic properties of chromium tetraaminophthalocyanine

Cited by 14 publications

References 27 publications

Tuning the redox properties of metalloporphyrin- and metallophthalocyanine-based molecular electrodes for the highest electrocatalytic activity in the oxidation of thiols

Tuning the redox properties of metalloporphyrin- and metallophthalocyanine-based molecular electrodes for the highest electrocatalytic activity in the oxidation of thiols

An Electrochemical Nitrite Sensor Based on a Multilayer Film of Polyoxometalate

X-Ray Diffraction Study of Crystal Structure and Thin Films of Chromium(II) Phthalocyaninate

Contact Info

Product

Resources

About