ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the linear trinuclear complex hexakis(acetato)bis(2,2'-bipyridine)trimanganese (II). Determination J electron-exchange parameter through magnetic susceptibility and high-field magnetization measurementsS. Menage, S. E. Vitols, P. Bergerat, Codjovi, O. Kahn, J. Girerd, M. Guillot, X. Solans, T. CalvetCite this: Inorg. Chem. 1991, 30, 12, 2666–2671Publication Date (Print):June 1, 1991Publication History Published online1 May...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkane oxidation catalyzed by .mu.-oxo-bridged diferric complexes: a structure/reactivity correlation studyStephane Menage, Jean Marc Vincent, Claude Lambeaux, Genevieve Chottard, Andre Grand, and FontecaveCite this: Inorg. Chem. 1993, 32, 22, 4766–4773Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures and properties of dibridged (.mu.-oxo)diiron(III) complexes. Effects the Fe-O-Fe angleRichard E. Norman, Richard C. Holz, Stephane Menage, Lawrence Que Jr., Jian H. Zhang, Charles J. O'ConnorCite this: Inorg. Chem. 1990, 29, 23, 4629–4637Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxygen binding to diferrous centers. Models for diiron-oxo proteinsYanhong Dong, Stephane Menage, Bridget A. Brennan, Timothy E. Elgren, Ho G. Jang, Linda L. Pearce, and Lawrence Que Jr.Cite this: J. Am. Chem. Soc. 1993, 115, 5, 1851–1859Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/doi/10.1021/ja00058a033https://doi.org/10.1021/ja00058a033research-articleACS...

Manipulation of the coordination sphere an FeII ion can be used to tune balance between different catalytic pathways for oxidation (OH. versus iron-based oxidant; see scheme). This reinvestigation Fenton chemistry uses iron complex shown as a mechanistic probe.

cis-[Ru(dmp)(2)(CH(3)CN)(2)][PF(6)](2) (dmp = 2,9-dimethyl-1,10-phenanthroline), complex 1[PF(6)](2), exists in two enantiomeric forms, Delta and Lambda. During treatment with the chiral anion tris[tetrachlorobenzene-1,2-bis(olato)]phosphate(V), also named Trisphat, dichloromethane it has been possible to selectively precipitate each enantiomer, associated Trisphat form of heterochiral pair. This enantiomerically pure compound characterized solution by UV-visible, CD, ESI-MS, NMR...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for iron-oxo proteins: dioxygen binding to a diferrous complexStephane Menage, Bridget A. Brennan, Carlos Juarez-Garcia, Eckard Munck, and Lawrence Que Jr.Cite this: J. Am. Chem. Soc. 1990, 112, 17, 6423–6425Publication Date (Print):August 1, 1990Publication History Published online1 May 2002Published inissue 1 August 1990https://pubs.acs.org/doi/10.1021/ja00173a055https://doi.org/10.1021/ja00173a055research-articleACS PublicationsRequest...

The reaction of a cuprous center coordinated to calix[6]arene-based aza-cryptand with dioxygen has been studied. In this system, Cu(I) is bound tren unit that caps the calixarene core at level small rim. As result, although protected from medium by macrocycle, metal presents labile site accessible guest ligands. Indeed, in presence O2, it reacts very fast and irreversible redox process, leading, ultimately, Cu(II) species. coordinating solvent MeCN, one electron exchange occurs, yielding...

In our research program aiming to develop new ruthenium-based polypyridine catalysts for oxidation we were interested in combining a photosensitizer and catalytic fragment within the same complex achieve light-driven oxidation. To respond lack of such conjugates, report here system capable using light activate water molecules order perform selective sulfide oxygenation into sulfoxide via an oxygen atom transfer from H(2)O substrate with TON up 197 ± 6. On basis electrochemical photophysical...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and reactivity of a bis(.mu.-acetato-O,O')diiron(II) complex, [Fe2(O2CCH3)2(TPA)2](BPh4)2. A model for the diferrous core ribonucleotide reductaseStephane Menage, Yan Zang, Michael P. Hendrich, Lawrence Que Jr.Cite this: J. Am. Chem. Soc. 1992, 114, 20, 7786–7792Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://doi.org/10.1021/ja00046a026RIGHTS &...

Peroxoiron species have been proposed to be involved in catalytic cycles of iron-dependent oxygenases and some cases as the active intermediates during oxygen-transfer reactions. The properties a mononuclear iron complex, [FeII(pb)2(CH3CN)2] (pb=(−)4,5-pinene-2,2′-bipyridine), compared those its related dinuclear analogue. Each system generates specific peroxo adducts, which are responsible for oxidation sulfides sulfoxides. catalyst was found more reactive (enantio)selective than...

With the objective to convert light energy into chemical oxidation energy, a ruthenium-based dyad constituted of assembly photosensitizer and catalytic fragment was synthesized. Upon irradiation with blue LEDs, in presence an electron acceptor, complex is able catalyze selective sulfide oxygenation involving oxygen atom transfer from water substrate. Electrochemical photophysical studies highlighted proton-coupled (PCET) access high valent oxidant Ru(IV) oxo species.

Designing systems that merge the advantages of heterogeneous catalysis, enzymology, and molecular catalysis represents next major goal for sustainable chemistry. Cross-linked enzyme crystals display most these essential assets (well-designed mesoporous support, protein selectivity, recognition substrates). Nevertheless, a lack reaction diversity, particularly in field oxidation, remains constraint their increased use field. Here, thanks to design cross-linked artificial nonheme iron...

Dioxygen activation by copper complexes is a valuable method to achieve oxidation reactions for sustainable chemistry. The development of catalytic system requires regeneration the Cu(I) active redox state from Cu(II). This usually achieved using extra reducers that can compete with Cu(II)(O2) oxidizing species, causing loss efficiency. An alternative would consist photosensitizer control reduction process. Association Ru(II) photosensitizing subunit Cu(II) pre-catalytic moiety assembled...

Chemical models of active sites diiron oxo proteins have been synthesized. The polydendate ligands are EDTA derivatives which provide a balanced supply nitrogen atoms and carboxylate groups together with an oxidizable phenyl moiety, thus mimicking both the iron coordination in methane monooxygenase nearby substrate site. All diferric complexes characterized solution by ESI-MS, optical absorption, some cases 1H NMR. In case ligand L1 [L1 = (N,N'-bis(3,4,5-trimethoxybenzyl)ethylenediamine...

The catalytic properties of the diiron complex 1, Fe(2)OL(4)(H(2)O)(2)(ClO(4))(4) with L = (-)-4,5-pinenebipyridine, a chiral bipyridine derivative, have been investigated. Complex 1 efficiently catalyzes oxidation aryl sulfides to corresponding sulfoxides by hydrogen peroxide, yields ranging from 45 90% based on oxidant. Furthermore reactions were enantioselective and produced mixture sulfoxide enantiomers significant enantiomeric excesses. largest ee value (40%) was found in case...

The µ-oxo-bridged diiron(III) complex [Fe2O(bipy)4(OH2)2][ClO4]41(bipy = 2,2′-bipyridine) was found to exhibit monooxygenase-like activity, using H2O2 as the oxidant. system oxidizes alkanes alcohols and ketones quite efficiently (46 mmol of cyclohexanol + cyclohexanone per rnmol in 10 min). In case adamantane, selectivity for tertiary hydrogen indicated by a high normalized C3:C2 ratio 9:1. same reaction yields rates were obtained whether argon or dioxygen bubbled through solution. Dimethyl...

The dinuclear chiral complex Fe2O(bisPB)4(X)2(ClO4)4 (X = H2O or CH3CN) catalyzes with high efficiency (up to 850 TON) and moderate enantioselectivity (63%) the epoxidation of electron deficient alkenes at 0 °C by a peracid.

A new MnIII binuclear system with an oxo-bis(acetato) bridge and water co-ordinated to the Mn ions has been synthesized, crystallographically characterized, its antiferromagnetic coupling measured (singlet–triplet gap 6·8 cm–1).