A5047960759- Linguistics and Discourse Analysis
- X-ray Diffraction in Crystallography
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Institut de Chimie Moléculaire de l'Université de Bourgogne
2015-2024
Institut de Chimie
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Université de Bourgogne
2015-2024
Laboratoire de Génie Chimique
2008-2024
Université de Toulouse
2020-2024
Institut National Polytechnique de Toulouse
2020-2024
École Nationale Supérieure des Ingénieurs en Arts Chimiques et Technologiques
2024
Université Toulouse III - Paul Sabatier
2024
Université Bourgogne Franche-Comté
2016-2023
Oxygen reduction catalyzed by cofacial metalloporphyrins at the 1,2-dichlorobenzene–water interface was studied with two lipophilic electron donors of similar driving force, 1,1′-dimethylferrocene (DMFc) and tetrathiafulvalene (TTF). The reaction produces mainly water some hydrogen peroxide, but mediator has a significant effect on selectivity, as DMFc porphyrins themselves catalyze decomposition further peroxide. Density functional theory calculations indicate that biscobaltporphyrin,...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDinuclear Catecholate Helicates: Their Inversion MechanismBerthold Kersting, Michel Meyer, Ryan E. Powers, and Kenneth N. RaymondView Author Information Department of Chemistry, University California Berkeley, 94720Cite this: J. Am. Chem. Soc. 1996, 118, 30, 7221–7222Publication Date (Web):July 31, 1996Publication History Received24 April 1996Published online31 July inissue 1 January...
Currently, the most commonly used chelator for labelling antibodies with
A series of dinuclear M(III) (M = Fe or Ga) catecholate complexes has been prepared using bisbidentate ligands (L). The products contain discrete, M2(L)36- anions featuring pseudo-octahedral coordination centers. helical nature the established by CD spectroscopy and X-ray crystallography. salt (N(CH3)4)6Ga2(L3)3 (L3 N,N'-bis(2,3-dihydroxy-4-carbamoylbenzoyl)-1,4-phenylenediamine) characterized diffraction; crystals are hexagonal, space group P3̄1c with unit cell dimensions a 14.283(2) Å, c...
Ultraviolet spectrophotometry was used to investigate the effects, 30 yr after planting, of tree species substitution on aromatic C content and related properties dissolved organic carbon (DOC). Precautions were taken correct measurements for absorbance NO 3 Fe. In litter leachates, a significant reduction in DOC found Douglas‐fir [ Pseudotsuga menziesii (Mirb.) Franco] plantation but not beech ( Fagus sylvatica L.) plantation. The disturbance short‐term dynamics thus revealed agreed well...
The diprotonated form of a fluorinated free base porphyrin, namely 5-(p-aminophenyl)-10,15,20-tris(pentafluorophenyl)porphyrin (H2FAP), can catalyze the reduction oxygen by weak electron donor, ferrocene (Fc). At water/1,2-dichloroethane interface, interfacial formation H4FAP2+ is observed UV−vis spectroscopy and ion-transfer voltammetry, due to double protonation H2FAP at imino nitrogen atoms in tetrapyrrole ring. shown bind oxygen, complex organic phase easily be reduced Fc produce...
Enterobactin mediates iron uptake in Escherichia coli and related bacteria. The structure of the neutral protonated ferric enterobactin complex Fe[H3enterobactin] has been source some controversy literature. coordination chemistry new model ligands tris[(2-hydroxybenzoyl)-2-aminoethyl]amine (TRENSAM) tris[(2-hydroxy-3-methoxybenzoyl)-2-aminoethyl]amine (TREN(3M)SAM) demonstrate previously proposed tris-salicylate mode binding for enterobactin; they form 1:1 metal−ligand complexes with Fe3+...
Abstract A linear relationship between the proton relaxation rates and fraction of deoxyhemoglobin circulating whole blood ( f Hb ) has been established in vitro at 4.7 T. These results have interpreted on basis additivity rates. The slope lines transverse R 2 versus was found to increase with interpulse delay Carr‐Purcell Meiboom‐Gill (CPMG) experiments. Luz‐Mei‐boom relation applied this dependence suggests a two‐site chemical exchange rather than diffusion mechanism. 1‐ms water time...
A new colorimetric molecular sensor allowing for cheap, fast, sensitive, and highly selective naked-eye detection of Hg2+ in water is described. This molecule combines a 1,8-diaminoanthraquinone signaling subunit phosphonic acid esters that confer the solubility to dye (R = H). ready-to-use solid was obtained by incorporating an amphiphilic analog OC12H25) exhibiting similar binding properties optical responses agarose film.
<sup>227</sup>Th is a promising radioisotope for targeted α-particle therapy. It produces 5 α-particles through its decay, with the clinically approved <sup>223</sup>Ra as first daughter. There an ample supply of <sup>227</sup>Th, allowing clinical use; however, chemical challenges chelating this large tetravalent <i>f</i>-block cation are considerable. Using CD20-targeting antibody ofatumumab, we evaluated chelation <sup>227</sup>Th<sup>4+</sup> α-particle–emitting and radiotheranostic...
The formation constants of mono- and bischelate copper(I) complexes with four phenanthroline derivatives have been determined by absorption spectrophotometry in acetonitrile a ternary acetonitrile/dichloromethane/water 80/15/5 (v/v) mixture. influence electron-donating methyl anisyl substituents positions 2 9 the core has investigated using both symmetrical (dmp = 2,9-dimethyl-1,10-phenanthroline; dap 2,9-di(p-anisyl)-1,10-phenanthroline) unsymmetrical (map 2-(p-anisyl)-1,10-phenanthroline;...
The synthesis and iron(III) coordination properties of three tripodal ligands (L1, L2, L3) possessing hydroxamate cavities are examined by various methods (ESMS, UV−vis, CD). rely on a trisamine as anchor, which is extended an alternating sequence variable spacers hydroxamates ion binding groups. This modular strategy design adopted for the compounds' preparation enables modifications each structural element independently. these iron molecules particularly presence allosteric effects...
A novel one-step synthesis of the macrocyclic triserine trilactone scaffold siderophore enterobactin, which eliminates β-lactonization step N-tritylserine, is presented. The cyclization reaction based on a stannoxane template and leads to an overall yield ∼50%. This enables practical functionalization by attaching chelating groups other than catecholamides. conformational stability ring has been examined high-resolution X-ray diffraction studies N-trityl intermediate: crystals grown from...
The cyanide-assisted demetalation kinetics of four molecular dicopper(I) trefoil knots, related face-to-face constitutional isomers and a double-stranded helical knot's precursor, have been investigated by single-wavelength multiwavelength absorption spectrophotometry in order to gain insight into the particular properties induced interlacing 1,10-phenanthroline chelating units. nonentangled dinuclear complexes are demetalated according two consecutive, bimolecular rate-limiting step...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLinear molecular recognition: spectroscopic, photophysical, and complexation studies on .alpha.,.omega.-alkanediyldiammonium ions binding to a bisanthracenyl macrotricyclic receptorFrederic Fages, Jean Pierre Desvergne, Kathrin Kampke, Henri Bouas-Laurent, Marie Lehn, Michel Meyer, Anne Albrecht-GaryCite this: J. Am. Chem. Soc. 1993, 115, 9, 3658–3664Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue...
Incorporation of a biotinylated ruthenium tris(bipyridine) [Ru(bpy)2(Biot-bpy)]2+ (1) in either avidin or streptavidin(strept)avidincan be conveniently followed by circular dichroism spectroscopy. To determine the stepwise association constants, cooperativity, and chiral discrimination properties, diastereopure (Λ Δ)-1 species were synthesized incorporated tetrameric (strept)avidin to afford (Δ-[Ru(bpy)2(Biot-bpy)]2+)x⊂avidin, (Λ-[Ru(bpy)2(Biot-bpy)]2+)x⊂avidin,...
Single- as well multi-anchored cyclam-functionalized silica samples have been prepared by grafting amorphous gel (K60) and mesostructured (SBA-15) with silylated cyclam precursors bearing one, two, or four triethoxysilyl groups, respectively ascribed to cyclam-mono, cyclam-di, cyclam-tetra. Their reactivity toward copper(II) has thoroughly investigated in aqueous solution discussed respect the number of arms tethering ligand surface structural ordering adsorbent terms capacity, long-term...