Application of Absorption Spectrum of Ferric Acetate Complex to Determination of Iron

Reiss, Wilhelm; Hazel, J. Fred; McNabb, Wallace M.

doi:10.1021/ac60070a045

Cited by 10 publications

(5 citation statements)

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“…The (N,O)-phenol-thiazoline part of the second Pch ligand is most likely implicated, as suggested by our spectrophotometric data. 6,15,19,47,49,90 Indeed, the two phenolate→Fe(III) CT bands experience hyper-and hypochromic shifts in agreement with the involvement of two phenolates. Semi-empirical approach 51 on the 1 : 2 Fe(III)-Pch complex has also shown that a more stable geometry is obtained when one Pch acts as a tetradentate ligand, while the second is involved as bidentate chelator, thus affording an iron(III) cation lying in an asymmetrical octahedral geometry.…”

Section: Structural Properties Of the Pyochelin Metal Complexesmentioning

confidence: 77%

“…6) at 524 nm (ε 524 = 1.82 × 10 3 M −1 cm −1 ) and 422 nm (ε 422 = 2.93 × 10 3 M −1 cm −1 ), respectively. These two absorptions can be attributed to phenolate→Fe(III) [47][48][49] charge transfers. The CT band centered at 524 nm is assigned to a transition from π 1 (HOMO orbital of π symmetry) to an iron d π (t 2g ) orbital (π 1 →d xz ), while the one at 422 nm corresponds to a π 1 →d xy transition.…”

Section: Complexation Of Iron(iii) By Pyochelinmentioning

confidence: 99%

“…6 and Fig. S7 †) evidenced the presence of two absorptions in the visible region at λ max ∼ 422 and 524 nm, which were attributed to phenolate→Fe(III) [47][48][49] charge transfers (π 1 →d xy and π 1 →d xz ). Similar absorption bands 50 have been previously observed in the spectra of ferric complexes with various N-salicylidene-L-amino acids.…”

Section: Structural Properties Of the Pyochelin Metal Complexesmentioning

confidence: 99%

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Pyochelin, a siderophore of Pseudomonas aeruginosa: Physicochemical characterization of the iron(iii), copper(ii) and zinc(ii) complexes

et al. 2012

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Pseudomonas aeruginosa is an opportunistic pathogen, synthesizing two major siderophores, pyoverdine (Pvd) and pyochelin (Pch), to cover its needs in iron(III). If the high affinity and specificity of Pvd toward iron(III) (pFe = 27.0) was well described in the literature, the physicochemical and coordination properties of Pch toward biologically relevant metals (Fe(III), Cu(II) or Zn(II)) have been only scarcely investigated. We report a thorough physico-chemical investigation of Pch (potentiometry, spectrophotometries, ESI/MS) that highlighted its moderate but significantly higher affinity for Fe(3+) (pFe = 16.0 at p[H] 7.4) than reported previously. We also demonstrated that Pch strongly chelates divalent metals such as Zn(II) (pZn = 11.8 at p[H] 7.4) and Cu(II) (pCu = 14.9 at p[H] 7.4) and forms predominantly 1 : 2 (M(2+)/Pch) complexes. Kinetic studies revealed that the formation of the ferric Pch complexes proceeds through a Eigen-Wilkins dissociative ligand interchange mechanism involving two protonated species of Pch and the Fe(OH)(2+) species of Fe(III). Our physico-chemical parameters supports the previous biochemical studies which proposed that siderophores are not only devoted to iron(III) shuttling but most likely display other specific biological role in the subtle metals homeostasis in microorganisms. This work also represents a step toward deciphering the role of siderophores throughout evolution.

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Section: Structural Properties Of the Pyochelin Metal Complexesmentioning

confidence: 77%

Section: Complexation Of Iron(iii) By Pyochelinmentioning

confidence: 99%

Section: Structural Properties Of the Pyochelin Metal Complexesmentioning

confidence: 99%

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Pyochelin, a siderophore of Pseudomonas aeruginosa: Physicochemical characterization of the iron(iii), copper(ii) and zinc(ii) complexes

et al. 2012

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“…510 nm and ca. 970-1005 nm are assigned to acetate complexes of Fe(III) [111][112][113]. Their intensity increases with the H 2 O 2 content due to generation of Fe(III) in a reaction with the latter.…”

Section: Estimation Of H 2 O 2 Content In the Electrolyte Bathmentioning

confidence: 98%

“…395 nm overlap Fe signals located in this wavelength range, including the ones attributed to acetate complexes of Fe(III) and located below ca. 480 nm [110,111]. Signals at ca.…”

Section: Estimation Of H 2 O 2 Content In the Electrolyte Bathmentioning

confidence: 99%

Electrochemical deposition of nickel from aqueous electrolytic baths prepared by dissolution of metallic powder

Próchniak

Grdeń

2021

J Solid State Electrochem

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A new method of preparation of aqueous electrolyte baths for electrochemical deposition of nickel targets for medical accelerators is presented. It starts with fast dissolution of metallic Ni powder in a HNO3-free solvent. Such obtained raw solution does not require additional treatment aimed to removal nitrates, such as the acid evaporation and Ni salt precipitation-dissolution. It is used directly for preparation of the nickel plating baths after dilution with water, setting up pH value and after possible addition of H3BO3. The pH of the baths ranges from alkaline to acidic. Deposition of 95% of ca. 50 mg of Ni dissolved in the bath takes ca. 3.5 h for the alkaline electrolyte while for the acidic solution it requires ca. 7 h. The Ni deposits obtained from the acidic bath are physically and chemically more stable and possess smoother and crack-free surfaces as compared to the coatings deposited from the alkaline bath. A method of estimation of concentration of H2O2 in the electrolytic bath is also proposed.

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Iron‐Catalyzed Dioxygenation of Alkenes and Terminal Alkynes by using (Diacetoxyiodo)benzene as Oxidant

2015

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An iron-catalyzed syn-diacetoxylation of alkenes and 1,2-oxyacetoxylation of terminala lkynes has been developed using (diacetoxyiodo)benzenea s oxidant. Ab road range of internal and terminal alkenes, including electron-rich as wella se lectron-deficient alkenes,g avet he desired products in good to excellent yields with high diastereoselectivity (up to > 99:1 dr). In addition the high catalytic activity of iron catalysisfor the 1,2-oxyacetoxylation of terminal alkynes is also reported. Ther oles of catalyst, oxidant and other reactionp arameters were evaluated for activation of the unsaturated bond.

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Application of Absorption Spectrum of Ferric Acetate Complex to Determination of Iron

Cited by 10 publications

References 3 publications

Pyochelin, a siderophore of Pseudomonas aeruginosa: Physicochemical characterization of the iron(iii), copper(ii) and zinc(ii) complexes

Pyochelin, a siderophore of Pseudomonas aeruginosa: Physicochemical characterization of the iron(iii), copper(ii) and zinc(ii) complexes

Electrochemical deposition of nickel from aqueous electrolytic baths prepared by dissolution of metallic powder

Iron‐Catalyzed Dioxygenation of Alkenes and Terminal Alkynes by using (Diacetoxyiodo)benzene as Oxidant

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