Synthesis and characterization of an imine-oxime copper(III) complex

Sulfab, Yousif; AL-SHATTI, N. I.

doi:10.1016/s0020-1693(00)83610-5

Cited by 19 publications

(5 citation statements)

References 4 publications

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“…This reaction is assigned as formation of the Co(III) cation radical, [((CN)4TPP)Conl]2+, and can be compared with a similar reaction that occurs at £,<2 = 0.97 V for [(TPP)Coln]2+ formation in CH2C12. 13 The currents for process 1 decreased as pyridine was added to CH2C12 and finally disappeared as the py concentration approached 1.1 X 10~3 M (~0.9 equiv of pyridine). At the same time two new oxidation peaks appeared at higher pyridine concentration.…”

Section: Methodsmentioning

confidence: 98%

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Electrochemistry, spectroelectrochemistry, and ligand addition reactions of an easily reducible cobalt porphyrin. Reactions of (Tetracyanotetraphenylporphinato)cobalt(II) (((CN)4TPF)Co(II)) in pyridine and in pyridine/methylene chloride mixtures

Lin¹,

Boisselier-Cocolios²,

Kadish³

1986

Inorg. Chem.

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The electrochemistry, spectroelectrochemistry, and pyridine binding reactions of ((CN)4TPP)Con were investigated in nine nonaqueous solvents. The four electron-withdrawing CN groups on the porphyrin ring lead to extremely facile reductions such that three one-electron additions could be observed within the range of the solvent. The first reduction occurred between -0.21 and -0.51 V vs. SCE and was assigned as due td formation of Co(II) anion radical. This is in contrast to reduction of unsubstituted (TPP)Co11 where the formation of Co(I) is postulated to occur. The second reduction of ((CN)4TPP)Co occurs between -0.80 and -0.94 V vs. SCE and is assigned as due to formation of a Co(I) anion radical. Finally, the third reduction occurs between -1.72 and -1.78 V vs. SCE and is assigned as due to formation of a Co(I) dianion. All three reductions were monitored by thin-layer spectroelectrochemistry, and the spectrum of each reduction product was obtained. A spectrum of electrooxidized ((CN)4TPP)Con was also obtained in pyridine and methylene chloride. The former solvent is the only one in which a well-defined Co(II) ¡=2 Co(III) transition was observed. In addition, the electrochemistry and pyridine binding reactions of ((CN)4TPP)Co were investigated in CH2Cl2/pyridine mixtures. Values of E¡¡2 for each electrode reaction were monitored as a function of pyridine concentration, and on the basis of these data, an overall oxidation-reduction and ligand addition scheme was formulated. Stability constants were measured for the stepwise addition of two pyridine molecules to ((CN)4TPP)Con and [((CN)4TPP)Com]+. Similar magnitudes of formation constants were obtained by using electrochemical and spectral methods to monitor the ligand binding reactions of Co(II). Both mono-and bis(pyridine) adducts to Co(II) were identified by electronic absorption spectroscopy.

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Section: Methodsmentioning

confidence: 98%

“…The design of this cell is described in the literature. 13 A Tracer Northern TN-1710 multichannel analyzer was combined with a TN-1710-24 floppy disk system for spectral acquisitions. In order to reduce noise, 100 acquisitions were automatically averaged over a 0.5-s period.…”

Section: Methodsmentioning

confidence: 99%

Electrochemistry, spectroelectrochemistry, and ligand addition reactions of an easily reducible cobalt porphyrin. Reactions of (Tetracyanotetraphenylporphinato)cobalt(II) (((CN)4TPF)Co(II)) in pyridine and in pyridine/methylene chloride mixtures

Lin¹,

Boisselier-Cocolios²,

Kadish³

1986

Inorg. Chem.

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“…Compared with bis(cyclopentadienyl) complexes, half-sandwich rare-earth metal complexes that contain only one cyclopentadienyl ligand show an increased potential for functionalization at the metal plexes by salt-metathesis reactions is often hampered by ate complex formation with concomitant alkali metal salt incorporation. [200][201][202] Alkane elimination was found to be a facile synthesis route to complexes of the type (Cp R )Ln(CH 2 -SiMe 3 ) 2 (donor) x . Reaction of Ln(CH 2 SiMe 3 ) 3 (thf) x (J thf ) with the respective substituted cyclopentadiene H(Cp R ) (Scheme 30) gave access to a large variety of mono(cyclopentadienyl)-bis(alkyl) complexes (Chart 10 and Table 4).…”

Section: Half-sandwich Complexesmentioning

confidence: 99%

Homoleptic Rare-Earth Metal Complexes Containing Ln−C σ-Bonds

2010

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S.A. Then he spent three years at the Universita ¨t Stuttgart starting his "habilitation" on "surface organometallic chemistry on nanoporous materials", which he completed in 2000 at TUM. From 2005 until 2008, he held the position "Heterogeneous Catalysis" at the University of Bergen, Norway. He joined the faculty of the Eberhardt-Karls University Tu ¨bingen, Germany, in 2009. His research interests include organometallic chemistry, nanostructured materials, and catalysis.

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“…7) and lipoxygenase. 50 Application of literature E° and pK a values for Cu(H_ 3 Aib 3 ) (below left) 84 and Cu(Pre) + (below center) 85 suggest bond strengths that predict hydrogen atom abstraction reactivity. Consistent with the prediction, Cu(Pre) + oxidizes DHA to anthracene in -50% yield.…”

Section: Copper(iii) and Iron(iii) Complexesmentioning

confidence: 99%

“…Thus Polanyi correlations of C-H bond reactions cannot be applied to oxidation of O-H bonds. The origin of this kinetic preference [85] BHT [81] DHA [78] PhOH [87] PhCH 2 CH 3 [85] BHT [81] DHA [78] has been discussed but is not established. 90 Mechanistic studies are in progress to determine whether the metal reactions proceed by simple hydrogen atom transfer, whether the phenol coordinates prior to oxidation, or if there is some other mechanism.…”

Section: Oxidations Of Phenolsmentioning

confidence: 99%

Thermodynamic Influences on C-H Bond Oxidation

Mayer

2000

Biomimetic Oxidations Catalyzed by Transition Metal Complexes

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Synthesis and characterization of an imine-oxime copper(III) complex

Cited by 19 publications

References 4 publications

Electrochemistry, spectroelectrochemistry, and ligand addition reactions of an easily reducible cobalt porphyrin. Reactions of (Tetracyanotetraphenylporphinato)cobalt(II) (((CN)4TPF)Co(II)) in pyridine and in pyridine/methylene chloride mixtures

Electrochemistry, spectroelectrochemistry, and ligand addition reactions of an easily reducible cobalt porphyrin. Reactions of (Tetracyanotetraphenylporphinato)cobalt(II) (((CN)4TPF)Co(II)) in pyridine and in pyridine/methylene chloride mixtures

Homoleptic Rare-Earth Metal Complexes Containing Ln−C σ-Bonds

Thermodynamic Influences on C-H Bond Oxidation

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