A5009570331- Metal-Catalyzed Oxygenation Mechanisms
- Metal complexes synthesis and properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Porphyrin and Phthalocyanine Chemistry
- Oxidative Organic Chemistry Reactions
- Magnetism in coordination complexes
- Crystallography and molecular interactions
- Photosynthetic Processes and Mechanisms
- Enzyme-mediated dye degradation
- Crystal structures of chemical compounds
- Metalloenzymes and iron-sulfur proteins
- Lanthanide and Transition Metal Complexes
- Chemical Synthesis and Reactions
- Electron Spin Resonance Studies
- Free Radicals and Antioxidants
- Electrochemical Analysis and Applications
- Advanced oxidation water treatment
- Synthesis and pharmacology of benzodiazepine derivatives
- Synthesis and Catalytic Reactions
- Radical Photochemical Reactions
- Hemoglobin structure and function
- Asymmetric Hydrogenation and Catalysis
- Radioactive element chemistry and processing
- Metal-Organic Frameworks: Synthesis and Applications
University of Pannonia
2015-2024
University of Groningen
2024
Veszprémi Érseki Hittudományi Fõiskola
1996-2021
Centrale Marseille
2014
Centre National de la Recherche Scientifique
2014
Aix-Marseille Université
2001-2014
University of Minnesota
2003-2008
Doshisha University
2008
HUN-REN Research Centre for Natural Sciences
2008
Hungarian Academy of Sciences
1999-2007
Nonheme oxoiron(IV) complexes of two pentadentate ligands, N4Py (N,N-bis(2-pyridylmethyl)-bis(2-pyridyl)methylamine) and Bn-tpen (N-benzyl-N,N',N'-tris(2-pyridylmethyl)-1,2-diaminoethane), have been generated found to spectroscopic properties similar the closely related tetradentate TPA (tris(2-pyridylmethyl)amine) complex reported earlier. However, unlike complex, a considerable lifetime at room temperature. This greater thermal stability has allowed hydroxylation alkanes with C−H bonds as...
Stabilizing the oxoiron(IV) unit: From a combination of X-ray crystallography, NMR spectroscopy, and DFT calculations, relative thermal stabilities two complexes with pentaaza ligands, such as that shown in picture, can be ascribed to number pyridine rings are oriented parallel FeO bond. (Fe pink, N blue, O red, C black.) Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z500485_s.pdf or from author. Please note: The publisher...
Transient mononuclear low-spin alkylperoxoiron(III) and oxoiron(IV) complexes that are relevant to the activation of dioxygen by nonheme iron enzymes have been generated from synthetic iron(II) neutral tetradentate (TPA) pentadentate (N4Py, Bn-TPEN) ligands structurally characterized means Fe K-edge X-ray absorption spectroscopy (XAS). Notable features obtained fits EXAFS region Fe−O bond lengths 1.78 Å for intermediates 1.65−1.68 intermediates, reflecting different strengths in π...
The reaction of [FeII(β-BPMCN)(OTf)2] (1, BPMCN = N,N'-bis(2-pyridylmethyl)-N,N'-dimethyl-trans-1,2-diaminocyclohexane) with tBuOOH at low-temperature yields alkylperoxoiron(III) intermediates 2 in CH2Cl2 and 2-NCMe CH3CN. At −45 °C above, converts to a pale green species 3 (λmax 753 nm, ε 280 M-1 cm-1) 90% yield, identified as [FeIV(O)(BPMCN)(NCCH3)]2+ by comparison other nonheme [FeIV(O)(L)]2+ complexes. Below −55 CH2Cl2, decays instead form deep turquoise 4 656, 845 nm; 4000, 3600 cm-1),...
Mesitylcopper reacts with flavonol (flaH) in the presence of 1,3-bis(2-pyridylimino)isoindoline (indH) to yield diamagnetic complex CuI(fla)(indH), which on reaction molecular oxygen undergoes oxidative splitting C2-C3 bond pyranone ring flavonolate ligand give CuI(indH)(O-bs) (O-bs = O-benzoylsalicylate) (orthorhombic, P1, a 8.048(7) A, b 8.969(9) c 19.240(2) alpha 85.69 degrees, beta 80.24(7) gamma 77.87(7) V 1337(2) A3, Z 2) and carbon monoxide. The [CuI(CH3CN)4]ClO4, flaH, indH dioxygen...
During the past decade isoindoline-based ligands became subject of growing interest due to their modular set-up.
A pushy Lewis base: Previously unobserved non-heme FeIVO intermediates can be trapped in the decay of FeIIIOOR species by addition bases (represented green sphere) that promote OO bond homolysis (see picture; Fe purple, O red).
A series of complexes with [FeII2(μ-OH)2] cores has been synthesized N3 and N4 ligands structurally characterized to serve as models for nonheme diiron(II) sites in enzymes that bind activate O2. These react O2 solution via bimolecular rate-limiting steps differ rate by 103-fold, depending on ligand denticity steric hindrance near the diiron center. Low-temperature trapping a (μ-oxo)(μ-1,2-peroxo)diiron(III) intermediate after binding requires sufficient around center loss proton (presumably...
Abstract The complex [Fe(indH)(solvent) 3 ](ClO 4 ) 2 ( 1 has been isolated from the reaction of equimolar amounts 1,3‐bis(2′‐pyridylimino)isoindoline (indH) and Fe(ClO in acetonitrile characterized by X‐ray crystallography several spectroscopic techniques. It is a suitable catalyst for oxidation thioanisoles benzyl alcohols with H O as oxidant. Hammett correlations kinetic isotope effect experiments support involvement an electrophilic metal‐based A metastable green species observed when...
Stabilisierung der Oxoeisen(IV)-Einheit: Aus den kombinierten Ergebnissen von Röntgenstrukturanalyse, NMR-Spektroskopie und DFT-Rechnungen folgt, dass die relativen thermischen Stabilitäten zweier Oxoeisen(IV)-Komplexe mit Pentaaza-Liganden – einer ist im Bild gezeigt Zahl an Pyridinringen korrelieren, parallel zur FeO-Bindung orientiert sind. Fe pink, N blau, O rot, C schwarz.
Low-spin mononuclear (alkylperoxo)iron(III) complexes decompose by peroxide O-O bond homolysis to form iron(IV) species. We examined the kinetics of previously reported reactions for intermediates supported TPA (tris(2-pyridylmethyl)amine) in CH3CN solution and promoted pyridine N-oxide, BPMCN (N,N-bis(2-pyridylmethyl)-N,N-dimethyl-trans-1,2-diaminocyclohexane) its cis-beta configuration CH2Cl2, as well unreported chemistry 5-Me3TPA acetone. Each these forms an oxoiron(IV) complex, except...
Mononuclear iron(III) flavonolate was synthesized as synthetic enzyme–substrate complex, and its direct carboxylate-enhanced dioxygenation biomimetic functional models with relevance to flavonol 2,4-dioxygenase are briefly described.
The chiral pentadentate low-spin (S = 1) oxoiron(IV) complex [FeIV(O)(asN4Py)]2+ (2) was synthesized and spectroscopically characterized. Its formation kinetics, reactivity, (enantio)selectivity in an oxygen-atom-transfer reaction investigated detail compared to a similar ligand-containing system.
Six dichloroiron(III) complexes of 1,3-bis(2′-arylimino)isoindoline (BAIH) with various N-donor aryl groups have been characterized by spectroscopy (infrared, UV–vis), electrochemistry (cyclic voltammetry), microanalysis, and in two cases X-ray crystallography. The structurally FeIIICl2(Ln) (n = 3, L3 1,3-bis(2′-thiazolylimino)isoindoline n 5, L5 1,3-bis(4-methyl-2′-piridylimino)isoindoline) are five-coordinate, trigonal bipyramidal the isoindoline ligands occupying axial one equatorial...
Cu(PPh3)2(fla) has been prepared by reacting copper(I) chloride with sodium flavonolate in tetrahydrofuran solution. Crystallographic characterization of the complex (orthorhombic, P212121, a = 9.588(1) Å, b 17.364(3) c 24.378(3) V 4058.6(10) Å3, Z 4, R 0.049) shown that coordination geometry molecule is tetrahedral. Oxygenation methylene solution at ambient conditions gives O-benzoylsalicylato copper Cu(PPh3)2(O-bs) and carbon monoxide. Labeling experiments an 18O2−16O2 mixture (1:4)...