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Your search keyword '"Chimie, Electrochimie Moléculaires et Chimie Analytique ( CEMCA )"' showing total 6 results
Start Over Author "Chimie, Electrochimie Moléculaires et Chimie Analytique ( CEMCA )" Journal dalton transactions (cambridge, england : 2003)
6 results on '"Chimie, Electrochimie Moléculaires et Chimie Analytique ( CEMCA )"'

1. Bond dissociation energies of carbonyl gold complexes: a new descriptor of ligand effects in gold(i) complexes?

Author

Héloïse Dossmann, Richard B. Cole, Antony Memboeuf, Yves Gimbert, Anne Milet, Hervé Clavier, Chen-Hui Chan, Denis Lesage, David Gatineau, Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Parisien de Chimie Moléculaire (IPCM), Chimie Moléculaire de Paris Centre (FR 2769), Institut de Chimie du CNRS (INC)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Chimie Structurale Organique et Biologique (CSOB), Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie - UMR5182 (LC), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC), Département de Chimie Moléculaire (DCM), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Chimie, Electrochimie Moléculaires et Chimie Analytique (CEMCA), Université de Brest (UBO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO), Département de Chimie Moléculaire - Synthèse Et Réactivité en Chimie Organique (DCM - SeRCO ), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and ANR-17-EURE-0003,CBH-EUR-GS,CBH-EUR-GS(2017)

Subjects
010405 organic chemistry, Ligand, Bond strength, Chemistry, 010402 general chemistry, Tandem mass spectrometry, 01 natural sciences, Bond-dissociation energy, Dissociation (chemistry), 0104 chemical sciences, Catalysis, Inorganic Chemistry, chemistry.chemical_compound, Computational chemistry, Electronic effect, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Carbene
Abstract

International audience; Ligand electronic effects in gold(I) chemistry have been evaluated by means of the experimental determination of M-CO bond dissociation energies for 16 [L-Au-CO] + complexes, bearing L ligands widely used in gold catalysis. Energy-resolved analyzes have been achieved using tandem mass spectrometry with collision induced dissociation. Coupled to DFT calculations, this approach enables the quantification of ligand effects based on the LAu-CO bond strength. Further energy decomposition analysis gives access to detailed insights of this bond's properties. Whereas small differences are observed between phosphine-and phosphite-containing gold complexes, carbene ligands are shown to stabilize much more efficiently the gold-carbonyl bond.

Published
2018

2. Ligand effects on the electrochemical behavior of [Fe2(CO)5(L){μ-(SCH2)2(Ph)P=O}] (L = PPh3, P(OEt)3) hydrogenase model complexes

Author

Philippe Schollhammer, Wolfgang Imhof, Wolfgang Weigand, Jean Talarmin, Mohammad El-khateeb, Helmar Görls, Laith R. Almazahreh, Institut für Organische Chemie und Makromolekulare Chemie, Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany], Institut für Anorganische und Analytische Chemie, Chimie, Electrochimie Moléculaires et Chimie Analytique (CEMCA), Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), and Jordan University of Sciences and Technology

Subjects
Steric effects, Iron-Sulfur Proteins, Hydrogenase, Magnetic Resonance Spectroscopy, Stereochemistry, Molecular Conformation, 010402 general chemistry, Electrochemistry, Crystallography, X-Ray, Ligands, 01 natural sciences, Medicinal chemistry, Ferric Compounds, Inorganic Chemistry, chemistry.chemical_compound, Coordination Complexes, [CHIM]Chemical Sciences, Carbon Monoxide, 010405 organic chemistry, Chemistry, Ligand, Stereoisomerism, Electrochemical Techniques, 3. Good health, 0104 chemical sciences, Ferrocene
Abstract

International audience; In this paper we study the influence of substituting one CO ligand in [Fe2(CO)6{μ-(SCH2)2(Ph)P[double bond, length as m-dash]O}] (1) by better σ-donor L ligands affording [Fe2(CO)5(L){μ-(SCH2)2(Ph)P[double bond, length as m-dash]O}] {L = PPh3 (2) and P(OEt)3 (3)} in relation to the steric interactions and the voltammetric behavior. Cyclic voltammetric investigations under N2 and CO showed remarkable differences in the electrochemical behaviour of complexes 2 and 3: (i) Complex 2 tends to expel PPh3 upon reduction whereas complex 3 exhibits chemical reversibility and (ii) Under CO, complex 3 reacts with CO affording a new compound P, which shows a reversible wave at E1/2 ∼ −0.9 V (vs. ferrocenium/ferrocene couple). The presence of CO assists the formation of 1 after electrochemically induced loss of PPh3 during the voltammetric experiment of 2. Using DFT calculations we provide an explanation for the difference in stabilities between the Fe–PPh3 and Fe–P(OEt)3 bonds.

Published
2015

3. A new bis-tetraamine ligand with a chromophoric 4-(9-anthracenyl)-2,6-dimethylpyridinyl linker for glyphosate and ATP sensing

Author

Loïc J. Charbonnière, Raphaël Tripier, Sabah Abada, Nathalie Le Bris, Mourad Elhabiri, Jacky Pouessel, Chimie, Electrochimie Moléculaires et Chimie Analytique (CEMCA), Université de Brest (UBO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de chimie moléculaire (LCM), and Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Anions, Fluorophore, Magnetic Resonance Spectroscopy, Stereochemistry, Pyridines, Glycine, Protonation, 010402 general chemistry, Ligands, 01 natural sciences, Inorganic Chemistry, chemistry.chemical_compound, Adenosine Triphosphate, Polyamines, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Nucleotide, chemistry.chemical_classification, Anthracenes, [CHIM.ORGA]Chemical Sciences/Organic chemistry, 010405 organic chemistry, Ligand, Herbicides, Nuclear magnetic resonance spectroscopy, Hydrogen-Ion Concentration, Combinatorial chemistry, Fluorescence, 0104 chemical sciences, chemistry, Potentiometry, Spectrophotometry, Ultraviolet, Linker, Adenosine triphosphate
Abstract

International audience; The synthesis of a new linear bis-tetraamine ligand L1, based on two 1,4,8,11-tetraazaundecane units grafted at the 2 and 6 positions of a pyridinyl linker substituted by an anthracenyl fluorophore in the para position, is described and anion complexation studies of L1 with anionic substrates are reported. The protonation pattern and the study of the binding properties of L1 in an aqueous medium with two anionic substrates, the nucleotide adenosine triphosphate (ATP) and the herbicide glyphosate (N-(phosphonomethyl)glycine, PMG), were investigated by means of potentiometry, NMR spectroscopy and absorption and emission spectroscopic techniques. To decipher the impact of the chromophoric linker on the complexation process and to highlight its optical properties, a comparison is established with its previously reported analog L2 devoid of the anthracenyl group. The results unambiguously show that the protonation and complexation properties are preserved despite the presence of the bulky linker, allowing for the use of L1 as a fluorescent sensor for ATP and PMG.

Published
2013

4. Glyphosate and ATP binding by mononuclear Zn(II) complexes with non-symmetric ditopic polyamine ligands

Author

Barbara Valtancoli, Raphaël Tripier, Jacky Pouessel, Claudia Giorgi, Andrea Bencini, Nathalie Le Bris, Chimie, Electrochimie Moléculaires et Chimie Analytique (CEMCA), Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Dipartimento di Chimica ‘Ugo Schiff', Università degli Studi di Firenze, and Università degli Studi di Firenze = University of Florence [Firenze] (UNIFI)

Subjects
Magnetic Resonance Spectroscopy, Stereochemistry, Potentiometric titration, Glycine, Protonation, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, Ligands, 01 natural sciences, Inorganic Chemistry, chemistry.chemical_compound, Adenosine Triphosphate, Coordination Complexes, Polymer chemistry, Pyridine, Cyclam, Polyamines, Moiety, [CHIM]Chemical Sciences, Bifunctional, 010405 organic chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Nuclear magnetic resonance spectroscopy, Carbon-13 NMR, Hydrogen-Ion Concentration, 3. Good health, 0104 chemical sciences, Zinc, chemistry, Protons
Abstract

International audience; Binding of Zn(II) by the ditopic ligands L1py, L2py and L1para, composed of a cyclam unit linked to the linear polyamines 1,4,8,11-tetraazaundecane (L1py and L2para) and 1,4,7-triazaheptane (L2py) via a 2,6-dimethylpyridinyl (L1py and L2py) or a 1,4-dimethylbenzyl spacer (L2para), has been analyzed by means of potentiometric and 1H and 13C NMR measurements. All ligands form stable mononuclear Zn(II) complexes in a wide pH range, featuring the metal ion bound to the macrocyclic unit. The open-chain polyamine unit can easily bind several protons in aqueous solution affording protonated metal complexes at neutral and acidic pH values. These complexes behave as bifunctional receptors for the anionic substrates N-(phosphonomethyl)glycine (glyphosate or PMG) and ATP. Potentiometric, 1H and 31P NMR measurements show that the Zn(II) complex with L1py is the better receptor for both substrates, thanks to the simultaneous presence of a pyridine linker functionalized at its 2,6 positions and of a flexible linear tetraamine chain. In fact, these structural features allow a stronger interaction of PMG and ATP with both the protonated tetraamine moiety and the Zn(II)–cyclam core.

Published
2012

5. Complexation of the triphosphate anion: tuning the structure of cyclen based macrotricycles with 1,3-dimethylbenzene and 2,6-dimethylpyridine linkers. A potentiometric and NMR study

Author

Raphaël Tripier, Henri Handel, Nicolas Bernier, Guy Serratrice, Véronique Patinec, Stéphanie Develay, Michel Le Baccon, Chimie, Electrochimie Moléculaires et Chimie Analytique (CEMCA), Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Laboratoire d'études dynamiques et structurales de la sélectivité (LEDSS), and Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)

Subjects
Models, Molecular, Magnetic Resonance Spectroscopy, Pyridines, Potentiometric titration, Inorganic chemistry, Protonation, Xylenes, 010402 general chemistry, Cyclams, Ligands, 01 natural sciences, Pyrophosphate, Phosphates, Inorganic Chemistry, chemistry.chemical_compound, Cyclen, Heterocyclic Compounds, [CHIM]Chemical Sciences, Polycyclic Compounds, Equilibrium constant, Chelating Agents, 010405 organic chemistry, Ligand, Hydrogen bond, Nuclear magnetic resonance spectroscopy, Hydrogen-Ion Concentration, 0104 chemical sciences, Diphosphates, Crystallography, chemistry, Models, Chemical, Potentiometry, Protons
Abstract

International audience; The host–guest interaction between orthophosphate, pyrophosphate and triphosphate anions and three cyclen-based macrotricyclic ligands was investigated by potentiometric measurements and NMR spectroscopy. The ligands differ from one another by the nature of their spacers, which are 1,3-dimethylbenzene (TMC), 2,6-dimethylpyridine (TPyC) or a combination of the two (TMPyC). In aqueous solution, each ligand gave protonated species that further formed ternary complexes after binding with anions; these complexes were analyzed as a result of hydrogen bond formation and coulombic attraction between the organic host and the inorganic guest. The equilibrium constants found for all the detected species are reported and the selectivity, illustrated with species distribution diagrams, is discussed. The results unambiguously showed that the ligand possessing a single supplementary anchoring site (the pyridinyl spacer) exhibited the greatest affinity for the phosphate species in a large p[H] range.

Published
2007

6. Cyclen based bis-macrocyclic ligands as phosphates receptors. A potentiometric and NMR study

Author

Henri Handel, Michel Le Baccon, Véronique Patinec, Raphaël Tripier, Stéphanie Develay, Guy Serratrice, Chimie, Electrochimie Moléculaires et Chimie Analytique (CEMCA), Université de Brest (UBO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO), Structure et Réactivité des Systèmes Moléculaires Complexes (SRSMC), and Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
Models, Molecular, Magnetic Resonance Spectroscopy, Orthophosphates, ligand, Cyclams, Ligands, 01 natural sciences, Pyrophosphate, chemistry.chemical_compound, Cyclen, Models, Heterocyclic Compounds, Bond formation, Molecular Structure, Hydrogen bond, pH, article, 10 tetraazacyclododecane, methodology, Nuclear magnetic resonance spectroscopy, anion, Hydrogen-Ion Concentration, Phase equilibria, Macrocycles, Anions, Macrocyclic Compounds, Inorganic chemistry, Potentiometric titration, Protonation, 010402 general chemistry, chemistry, Sensitivity and Specificity, Hydrogen bonds, Phosphates, Inorganic Chemistry, Polymer chemistry, Molecule, [CHIM]Chemical Sciences, macrocyclic compound, phosphate, nuclear magnetic resonance spectroscopy, heterocyclic compound, 010405 organic chemistry, Ligand, Molecular, 0104 chemical sciences, chemical structure, Potentiometry
Abstract

cited By 31; International audience; The host-guest interaction between orthophosphate, pyrophosphate and triphosphate anions and four cyclen based bis-macrocycles ligands possessing ortho-(BOC), meta-(BMC), para-xylenyl (BPC) or 2,6-pyridinyl (BPyC) linker was investigated by potentiometric measurements and NMR spectroscopy. Each ligand gave protonated species in aqueous solution that further formed ternary complexes after binding with anions; these complexes were analyzed as a result of hydrogen bond formation and Coulombic attraction between the organic host and the inorganic guest. The equilibrium constants for all the detected species are reported and the selectivity, illustrated with species distribution diagrams, is discussed. The results unambiguously showed the importance of the distance between the two cyclen cores and underlined, especially for the triphosphate species, the contribution of the nitrogen atom of the pyridinyl spacer as a supplementary anchoring point in acidic medium. © The Royal Society of Chemistry 2005.

Published
2005

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