1
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Mondal A, Price CG, Tang J, Layfield RA. Targeted Synthesis of End-On Dinitrogen-Bridged Lanthanide Metallocenes and Their Reactivity as Divalent Synthons. J Am Chem Soc 2023; 145:20121-20131. [PMID: 37656516 PMCID: PMC10510326 DOI: 10.1021/jacs.3c07600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Indexed: 09/03/2023]
Abstract
High-yield syntheses of the lanthanide dinitrogen complexes [(Cp2tttM)2(μ-1,2-N2)] (1M, M = Gd, Tb, Dy; Cpttt = 1,2,4-C5tBu3H2), in which the [N2]2- ligands solely adopt the rare end-on or 1,2-bridging mode, are reported. The bulk of the tert-butyl substituents and the smaller radii of gadolinium, terbium, and dysprosium preclude formation of the side-on dinitrogen bonding mode on steric grounds. Elongation of the nitrogen-nitrogen bond relative to N2 is observed in 1M, and their Raman spectra show a major absorption consistent with N═N double bonds. Computational analysis of 1Gd identifies that the local symmetry of the metallocene units lifts the degeneracy of two 5dπ orbitals, leading to differing overlap with the π* orbitals of [N2]2-, a consequence of which is that the dinitrogen ligand occupies a singlet ground state. Magnetic measurements reveal antiferromagnetic exchange in 1M and single-molecule magnet (SMM) behavior in 1Dy. Ab initio calculations show that the magnetic easy axis in the ground doublets of 1Tb and 1Dy align with the {M-N═N-M} connectivity, in contrast to the usual scenario in dysprosium metallocene SMMs, where the axis passes through the cyclopentadienyl ligands. The [N2]2- ligands in 1M allow these compounds to be regarded as two-electron reducing agents, serving as synthons for divalent gadolinium, terbium, and dysprosium. Proof of principle for this concept is obtained in the reactions of 1M with 2,2'-bipyridyl (bipy) to give [Cp2tttM(κ2-bipy)] (2M, M = Gd, Tb, Dy), in which the lanthanide is ligated by a bipy radical anion, with strong metal-ligand direct exchange coupling.
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Affiliation(s)
- Arpan Mondal
- Department
of Chemistry, School of Life Sciences, University
of Sussex, Brighton BN1 9QJ, U.K.
| | - Christopher G.
T. Price
- Department
of Chemistry, School of Life Sciences, University
of Sussex, Brighton BN1 9QJ, U.K.
| | - Jinkui Tang
- State
Key Laboratory of Rare Earth Resource Utilization, Changchun Institute
of Applied Chemistry, Chinese Academy of
Sciences, Changchun 130022, P.R. China
| | - Richard A. Layfield
- Department
of Chemistry, School of Life Sciences, University
of Sussex, Brighton BN1 9QJ, U.K.
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2
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Schäfer S, Kaufmann S, Rösch ES, Roesky PW. Divalent metallocenes of the lanthanides - a guideline to properties and reactivity. Chem Soc Rev 2023. [PMID: 37183859 DOI: 10.1039/d2cs00744d] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Since the discovery in the early 1980s, the soluble divalent metallocenes of lanthanides have become a steadily growing field in organometallic chemistry. The predominant part of the investigation has been performed with samarium, europium, and ytterbium, whereas only a few reports dealing with other rare earth elements were disclosed. Reactions of these metallocenes can be divided into two major categories: (1) formation of Lewis acid-base complexes, in which the oxidation state remains +II; and (2) single electron transfer (SET) reductions with the ultimate formation of Ln(III) complexes. Due to the increasing reducing character from Eu(II) over Yb(II) to Sm(II), the plethora of literature concerning redox reactions revolves around the metallocenes of Sm and Yb. In addition, a few reactivity studies on Nd(II), Dy(II) and mainly Tm(II) metallocenes were published. These compounds are even stronger reducing agents but significantly more difficult to handle. In most cases, the metals are ligated by the versatile pentamethylcyclopentadienyl ligand: (C5Me5). Other cyclopentadienyl ligands are fully covered but only discussed in detail, if the ligand causes differences in synthesis or reactivity. Thus, the focus lays on three compounds: [(C5Me5)2Sm], [(C5Me5)2Eu] and [(C5Me5)2Yb] and their solvates. We discuss the synthesis and physical properties of divalent lanthanide metallocenes first, followed by an overview of the reactivity rendering the full potential of these versatile reactants.
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Affiliation(s)
- Sebastian Schäfer
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany.
| | - Sebastian Kaufmann
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany.
| | - Esther S Rösch
- Baden-Württemberg Cooperative State University Karlsruhe, Erzbergerstr. 121, 76133 Karlsruhe, Germany
| | - Peter W Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany.
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3
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Cemortan V, Simler T, Moutet J, Jaoul A, Clavaguéra C, Nocton G. Structure and bonding patterns in heterometallic organometallics with linear Ln-Pd-Ln motifs. Chem Sci 2023; 14:2676-2685. [PMID: 36908951 PMCID: PMC9993901 DOI: 10.1039/d2sc06933d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 01/20/2023] [Indexed: 01/22/2023] Open
Abstract
Complexes with short intermetallic distances between transition metal fragments and lanthanide (Ln) fragments are fascinating objects of study, owing to the ambiguity of the nature of the interaction. The addition of the divalent lanthanide fragments Cp*2Ln(OEt2) (Ln = Sm or Yb) to a Pd(ii) complex bearing the deprotonated form of the redox-active, non-symmetrical ligand, 2-pyrimidin-2-yl-1H-benzimidazole (Hbimpm), leads to two isostructural complexes, of the general formula (Cp*2Ln)2[μ-Pd(pyridyl)2] (Ln = Sm (4) and Yb (5)). These adducts have interesting features, such as unique linear Ln-Pd-Ln arrangements and short Ln-Pd distances, which deviate from the expected lanthanide contraction. A mixed computational and spectroscopic study into the formation of these adducts gathers important clues as to their formation. At the same time, thorough characterization of these complexes establishes the +3 oxidation state of all the involved Ln centers. Detailed theoretical computations demonstrate that the apparent deviation from lanthanide contraction is not due to any difference in the intermetallic interaction between the Pd and the Ln, but that the fragments are joined together by electrostatic interactions and dispersive forces. This conclusion contrasts with the findings about a third complex, Cp*2Yb(μ-Me)2PdCp* (6), formed during the reaction, which also possesses a short Yb-Pd distance. Studies at the CASSCF level of theory on this complex show several orbitals containing significant interactions between the 4f and 4d manifolds of the metals. This demonstrates the need for methodical and careful analyses in gauging the intermetallic interaction and the inadequacy of empirical metrics in describing such phenomena.
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Affiliation(s)
- Valeriu Cemortan
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris Route de Saclay Palaiseau 91120 France .,Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR8000 Orsay 91405 France
| | - Thomas Simler
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris Route de Saclay Palaiseau 91120 France
| | - Jules Moutet
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris Route de Saclay Palaiseau 91120 France
| | - Arnaud Jaoul
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris Route de Saclay Palaiseau 91120 France
| | - Carine Clavaguéra
- Université Paris-Saclay, CNRS, Institut de Chimie Physique UMR8000 Orsay 91405 France
| | - Grégory Nocton
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris Route de Saclay Palaiseau 91120 France
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4
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Mahieu N, Piątkowski J, Simler T, Nocton G. Back to the future of organolanthanide chemistry. Chem Sci 2023; 14:443-457. [PMID: 36741512 PMCID: PMC9848160 DOI: 10.1039/d2sc05976b] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Accepted: 11/29/2022] [Indexed: 12/02/2022] Open
Abstract
At the dawn of the development of structural organometallic chemistry, soon after the discovery of ferrocene, the description of the LnCp3 complexes, featuring large and mostly trivalent lanthanide ions, was rather original and sparked curiosity. Yet, the interest in these new architectures rapidly dwindled due to the electrostatic nature of the bonding between π-aromatic ligands and 4f-elements. Almost 70 years later, it is interesting to focus on how the discipline has evolved in various directions with the reports of multiple catalytic reactivities, remarkable potential in small molecule activation, and the development of rich redox chemistry. Aside from chemical reactivity, a better understanding of their singular electronic nature - not precisely as simplistic as anticipated - has been crucial for developing tailored compounds with adapted magnetic anisotropy or high fluorescence properties that have witnessed significant popularity in recent years. Future developments shall greatly benefit from the detailed reactivity, structural and physical chemistry studies, particularly in photochemistry, electro- or photoelectrocatalysis of inert small molecules, and manipulating the spins' coherence in quantum technology.
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Affiliation(s)
- Nolwenn Mahieu
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay91120 PalaiseauFrance
| | - Jakub Piątkowski
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay91120 PalaiseauFrance
| | - Thomas Simler
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay91120 PalaiseauFrance
| | - Grégory Nocton
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay91120 PalaiseauFrance
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5
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Tricoire M, Mahieu N, Simler T, Nocton G. Intermediate Valence States in Lanthanide Compounds. Chemistry 2021; 27:6860-6879. [PMID: 33340383 PMCID: PMC7610675 DOI: 10.1002/chem.202004735] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Indexed: 12/31/2022]
Abstract
Over more than 50 years, intermediate valence states in lanthanide compounds have often resulted in unexpected or puzzling spectroscopic and magnetic properties. Such experimental singularities could not be rationalised until new theoretical models involving multiconfigurational electronic ground states were established. In this minireview, the different singularities that have been observed among lanthanide complexes are highlighted, the models used to rationalise them are detailed and how such electronic effects may be adjusted depending on energy and symmetry considerations is considered. Understanding and tuning the ground-state multiconfigurational behaviour in lanthanide complexes may open new doors to modular and unusual reactivities.
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Affiliation(s)
- Maxime Tricoire
- LCM, CNRS, Ecole polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128, Palaiseau, cedex, France
| | - Nolwenn Mahieu
- LCM, CNRS, Ecole polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128, Palaiseau, cedex, France
| | - Thomas Simler
- LCM, CNRS, Ecole polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128, Palaiseau, cedex, France
| | - Grégory Nocton
- LCM, CNRS, Ecole polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128, Palaiseau, cedex, France
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6
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Müller I, Werncke CG. Reductive Coupling of (Fluoro)pyridines by Linear 3d-Metal(I) Silylamides of Cr-Co: A Tale of C-C Bond Formation, C-F Bond Cleavage and a Pyridyl Radical Anion. Chemistry 2021; 27:4932-4938. [PMID: 33453071 PMCID: PMC7986091 DOI: 10.1002/chem.202004852] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 12/21/2020] [Indexed: 01/10/2023]
Abstract
Herein, we disclose the facile reduction of pyridine (and its derivatives) by linear 3d-metal(I) silylamides (M=Cr-Co). This reaction resulted in intermolecular C-C coupling to give dinuclear metal(II) complexes bearing a bridging 4,4'-dihydrobipyridyl ligand. For iron, we demonstrated that the C-C coupling is reversible in solution, either directly or by reaction with substrates, via a presumed monomeric metal(II) complex bearing a pyridyl radical anion. In the course of this investigation, we also observed that the dinuclear metal(II) complex incorporating iron facilitated the isomerisation of 1,4-cyclohexadiene to 1,3-cyclohexadiene as well as equimolar amounts of benzene and cyclohexene. Furthermore, we synthesised and structurally characterised a non-3d-metal-bound pyridyl radical anion. The reactions of the silylamides with perfluoropyridine led to C-F bond cleavage with the formation of metal(II) fluoride complexes of manganese, iron and cobalt along with the homocoupling or reductive degradation of the substrate. In the case of cobalt, the use of lesser fluorinated pyridines led to C-F bond cleavage but no homocoupling. Overall, in this paper we provide insights into the multifaceted behaviour of simple (fluoro)pyridines in the presence of moderately to highly reducing metal complexes.
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Affiliation(s)
- Igor Müller
- Fachbereich Chemie/Department of ChemistryPhilipps-Universität MarburgHans-Meerwein-Strasse 435037MarburgGermany
| | - Christian Gunnar Werncke
- Fachbereich Chemie/Department of ChemistryPhilipps-Universität MarburgHans-Meerwein-Strasse 435037MarburgGermany
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7
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Hay MA, Boskovic C. Lanthanoid Complexes as Molecular Materials: The Redox Approach. Chemistry 2021; 27:3608-3637. [PMID: 32965741 DOI: 10.1002/chem.202003761] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Indexed: 11/05/2022]
Abstract
The development of molecular materials with novel functionality offers promise for technological innovation. Switchable molecules that incorporate redox-active components are enticing candidate compounds due to their potential for electronic manipulation. Lanthanoid metals are most prevalent in their trivalent state and usually redox-activity in lanthanoid complexes is restricted to the ligand. The unique electronic and physical properties of lanthanoid ions have been exploited for various applications, including in magnetic and luminescent materials as well as in catalysis. Lanthanoid complexes are also promising for applications reliant on switchability, where the physical properties can be modulated by varying the oxidation state of a coordinated ligand. Lanthanoid-based redox activity is also possible, encompassing both divalent and tetravalent metal oxidation states. Thus, utilization of redox-active lanthanoid metals offers an attractive opportunity to further expand the capabilities of molecular materials. This review surveys both ligand and lanthanoid centered redox-activity in pre-existing molecular systems, including tuning of lanthanoid magnetic and photophysical properties by modulating the redox states of coordinated ligands. Ultimately the combination of redox-activity at both ligands and metal centers in the same molecule can afford novel electronic structures and physical properties, including multiconfigurational electronic states and valence tautomerism. Further targeted exploration of these features is clearly warranted, both to enhance understanding of the underlying fundamental chemistry, and for the generation of a potentially important new class of molecular material.
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Affiliation(s)
- Moya A Hay
- School of Chemistry, University of Melbourne, Victoria, 3010, Australia
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Victoria, 3010, Australia
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8
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Wang D, Tricoire M, Cemortan V, Moutet J, Nocton G. Redox activity of a dissymmetric ligand bridging divalent ytter-bium and reactive nickel fragments. Inorg Chem Front 2021; 8:647-657. [PMID: 33575034 PMCID: PMC7116723 DOI: 10.1039/d0qi00952k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of a reactive nickel dimethyl 1 bearing a redox-active, dissymmetric ligand, which is obtained by deprotonation of 2-pyrimidin-2-yl-1H-benzimidazole (Hbimpm) with a divalent lanthanide complex, Cp*2Yb(OEt2), affords an unprecedented, trimeric 2 with C(sp3)-C(sp3) bond formation between two ligands in an exo position. Meanwhile, the transient, dimeric species 3 can be isolated with the same ligand coupling fashion, however, with a drastic distorsion angle of the bimpm ligand and reactive NiMe2 fragment, revealing the possible mechanism of this rearrangement. A much more stable dimeric congener, 5, with an exo ligand coupling, is synthesized in the presence of 18-crown-6, which captures the potassium counter ion. The C-C coupling formation between two bimpm ligands results from the effective electron transfer from divalent lanthanide fragments. Without the divalent lanthanide, the reductive coupling occurs on a different carbon of the ligand, nicely showing the modulation of the spin density induced by the presence of the lanthanide ion. The electronic structures of these complexes are investigated by magnetic study (SQUID), indicating a 2F7/2 ground state for each ytterbium in all the heterometallics. This work firstly reports ligand coupling reactivity in a redox-active, yet dissymmetric system with divalent organolanthanides, and the reactive nickel moiety can impact the intriguing transition towards a stable homoleptic, trinulear lanthanide species.
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Affiliation(s)
- Ding Wang
- LCM, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France
| | - Maxime Tricoire
- LCM, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France
| | - Valeriu Cemortan
- LCM, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France
| | - Jules Moutet
- LCM, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France
| | - Grégory Nocton
- LCM, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France
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9
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Boyce SAJ, Moutet J, Niederegger L, Simler T, Nocton G, Hess CR. Influence of a Lanthanide Ion on the Ni Site of a Heterobimetallic 3d-4f Mabiq Complex. Inorg Chem 2021; 60:403-411. [PMID: 33319984 DOI: 10.1021/acs.inorgchem.0c03058] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This work presents the synthesis and characterization of a 3d-4f bimetallic complex based on the redox-active macrocyclic biquinazoline ligand, Mabiq. The mixed Yb-Ni complex, [(Cp*)2Yb(Mabiq)Ni]BArF (3), was synthesized upon reaction of [NiII(Mabiq)]BArF (2) with (Cp*)2YbII(OEt2). The molecular structures of 3 and its sister complex, [(Cp*)2Yb(Mabiq)Ni][(Cp*)2Yb(OTf)2] (1), confirmed the presence of a Yb(III) center and a reduced Ni-Mabiq unit. Spectroscopy (absorption and NMR), cyclic voltammetry, and magnetic susceptibility studies were employed to analyze the electronic structure of 3, which is best described by the [(Cp*)2YbIII(Mabiq•)NiII]+ formulation. Notably, the ligand-centered radical is delocalized over both the diketiminate and bipyrimidine units of the Mabiq ligand. The magnetic susceptibility and variable temperature NMR studies for 3 denote coupling between the Ni-Mabiq site and the peripheral Yb center-previously unobserved in 3d-3d Mabiq complexes. The complex nature of the exchange interactions is highlighted by the multiconfigurational ground state for 3, comprising nearly degenerate singlet and triplet states.
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Affiliation(s)
- Stuart A J Boyce
- Department of Chemistry and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany.,School of Chemistry, The University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Jules Moutet
- LCM, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Cedex Palaiseau, France
| | - Lukas Niederegger
- Department of Chemistry and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Thomas Simler
- LCM, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Cedex Palaiseau, France
| | - Grégory Nocton
- LCM, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Cedex Palaiseau, France
| | - Corinna R Hess
- Department of Chemistry and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany
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10
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Haiduc I. Review. Inverse coordination. Organic nitrogen heterocycles as coordination centers. A survey of molecular topologies and systematization. Part 2. Six-membered rings. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1670349] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Ionel Haiduc
- Facultatea de Chimie, Universitatea Babeş-Bolyai, Cluj-Napoca, Romania
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11
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Drover MW, Schild DJ, Oyala PH, Peters JC. Snapshots of a Migrating H‐Atom: Characterization of a Reactive Iron(III) Indenide Hydride and its Nearly Isoenergetic Ring‐Protonated Iron(I) Isomer. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Marcus W. Drover
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
| | - Dirk J. Schild
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
| | - Paul H. Oyala
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
| | - Jonas C. Peters
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
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12
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Drover MW, Schild DJ, Oyala PH, Peters JC. Snapshots of a Migrating H-Atom: Characterization of a Reactive Iron(III) Indenide Hydride and its Nearly Isoenergetic Ring-Protonated Iron(I) Isomer. Angew Chem Int Ed Engl 2019; 58:15504-15511. [PMID: 31465624 DOI: 10.1002/anie.201909050] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Indexed: 12/22/2022]
Abstract
We report the characterization of an S= 1 / 2 iron π-complex, [Fe(η6 -IndH)(depe)]+ (Ind=Indenide (C9 H7 - ), depe=1,2-bis(diethylphosphino)ethane), which results via C-H elimination from a transient FeIII hydride, [Fe(η3 :η2 -Ind)(depe)H]+ . Owing to weak M-H/C-H bonds, these species appear to undergo proton-coupled electron transfer (PCET) to release H2 through bimolecular recombination. Mechanistic information, gained from stoichiometric as well as computational studies, reveal the open-shell π-arene complex to have a BDFEC-H value of ≈50 kcal mol-1 , roughly equal to the BDFEFe-H of its FeIII -H precursor (ΔG°≈0 between them). Markedly, this reactivity differs from related Fe(η5 -Cp/Cp*) compounds, for which terminal FeIII -H cations are isolable and have been structurally characterized, highlighting the effect of a benzannulated ring (indene). Overall, this study provides a structural, thermochemical, and mechanistic foundation for the characterization of indenide/indene PCET precursors and outlines a valuable approach for the differentiation of a ring- versus a metal-bound H-atom by way of continuous-wave (CW) and pulse EPR (HYSCORE) spectroscopic measurements.
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Affiliation(s)
- Marcus W Drover
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Dirk J Schild
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Paul H Oyala
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Jonas C Peters
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
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13
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Wang D, Moutet J, Tricoire M, Cordier M, Nocton G. Reactive Heterobimetallic Complex Combining Divalent Ytterbium and Dimethyl Nickel Fragments. INORGANICS 2019; 7:58. [PMID: 31463301 PMCID: PMC6713561 DOI: 10.3390/inorganics7050058] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
This article presented the synthesis and characterization of original heterobimetallic species combining a divalent lanthanide fragment and a divalent nickel center bridged by the bipyrimidine ligand, a redox-active ligand. X-ray crystal structures were obtained for the Ni monomer (bipym)NiMe2, 1, as well as the heterobimetallic dimer compounds, Cp*2Yb(bipym)NiMe2, 2, along with 1H solution NMR, solid-state magnetic data, and DFT calculations only for 1. The reactivity with CO was investigated on both compounds and the stoichiometric acetone formation is discussed based on kinetic and mechanistic studies. The key role of the lanthanide fragment was demonstrated by the relatively slow CO migratory insertion step, which indicated the stability of the intermediate.
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14
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Halbach RL, Nocton G, Amaro-Estrada JI, Maron L, Booth CH, Andersen RA. Understanding the Multiconfigurational Ground and Excited States in Lanthanide Tetrakis Bipyridine Complexes from Experimental and CASSCF Computational Studies. Inorg Chem 2019; 58:12083-12098. [PMID: 31456403 DOI: 10.1021/acs.inorgchem.9b01393] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robert L. Halbach
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Grégory Nocton
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau, France
| | | | - Laurent Maron
- LPCNO, UMR 5215, Université de Toulouse-CNRS, INSA, UPS, 31000 Toulouse, France
| | - Corwin H. Booth
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Richard A. Andersen
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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15
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Gupta AK, Salazar DM, Orthaber A. Solvent and Counter‐Ion Induced Coordination Environment Changes Towards Ag
I
Coordination Polymers. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900722] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Arvind Kumar Gupta
- Department of Chemistry Synthetic Molecular Chemistry Uppsala University BOX 523 75120 Uppsala Sweden
| | - Daniel Morales Salazar
- Department of Chemistry Synthetic Molecular Chemistry Uppsala University BOX 523 75120 Uppsala Sweden
| | - Andreas Orthaber
- Department of Chemistry Synthetic Molecular Chemistry Uppsala University BOX 523 75120 Uppsala Sweden
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16
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Zhou K, Liu J, Xiong X, Cheng M, Hu X, Narva S, Zhao X, Wu Y, Zhang W. Design, synthesis of 4,5-diazafluorene derivatives and their anticancer activity via targeting telomeric DNA G-quadruplex. Eur J Med Chem 2019; 178:484-499. [PMID: 31202994 DOI: 10.1016/j.ejmech.2019.06.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 06/02/2019] [Accepted: 06/03/2019] [Indexed: 01/19/2023]
Abstract
In our work, 19 novel 4,5-diazafluorene derivatives (11a-d, 12a-d, 13a-d, 14a-c, 15c, 16a-c) bearing a 1,3-disubstituted pyrazol/thioxothiazolidinone or thioxothiazolidinone-oxadiazole moieties were designed, synthesized, preliminarily explored for their antitumor activities and in vitro mechanism. All compounds showed different values of antiproliferative activity against A549, AGS, HepG2 and MCF-7 cell lines through CCK-8. Especially, the compound 14c exhibited the strongest activity and best selectivity against A549 cells with an IC50 1.13 μM and an SI value of 7.01 relative to MRC-5 cells, which was better than cisplatin (SI = 1.80) as a positive control. Experimental results at extracellular level demonstrated that compounds 14a-c could strongly interact with the G-quadruplex(es) formed in a 26 nt telomeric G-rich DNA, in particular, the 14c exhibits quite strong binding affinity with an association equilibrium constant (KA) of 7.04(±0.16) × 107 M-1 and more than 1000-fold specificity to G4-DNA over ds-DNA and Mut-DNA at the compound/G4-DNA ratio of 1:1. Further trap assay ascertained that compounds 14a-c owned strong inhibitory ability of telomerase activity in A549 cells, suggesting that these compounds have great possibility to target telomeric G-quadruplexes and consequently indirectly inhibit the telomerase activity. In addition, it is worthy of note that the remarkable inhibitory effects of 14a-c on the mobility of tested cancer cells were observed by wound healing assays. Furthermore, molecular docking and UV-Vis spectral results unclose the rationale for the interaction of compounds with such G-quadruplex(es). These results indicate that the growth and metastasis inhibition of cancer cells mediated by these 4,5-diazafluorene derivatives possibly result from their interaction with telomeric G-quadruplexes, suggesting that 4,5-diazafluorene derivatives, especially 14c, possess potential as anticancer drugs.
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Affiliation(s)
- Kang Zhou
- Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, China; Lab of Chemical Biology and Molecular Drug Design, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Jiachun Liu
- Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, China; Lab of Chemical Biology and Molecular Drug Design, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Xuqiong Xiong
- Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, China; Lab of Chemical Biology and Molecular Drug Design, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Mei Cheng
- Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, China; Lab of Chemical Biology and Molecular Drug Design, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Xiaolin Hu
- Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, China; Lab of Chemical Biology and Molecular Drug Design, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Suresh Narva
- Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, China; Lab of Chemical Biology and Molecular Drug Design, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Xiaoyin Zhao
- Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, China; Lab of Chemical Biology and Molecular Drug Design, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Yanling Wu
- Lab of Molecular Immunology, Virus Inspection Department, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, 310051, China.
| | - Wen Zhang
- Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, China; Lab of Chemical Biology and Molecular Drug Design, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou, 310014, China.
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17
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Jaoul A, Tricoire M, Moutet J, Cordier M, Clavaguéra C, Nocton G. Reversible electron transfer in organolanthanide chemistry. CHEMISTRY SQUARED 2019; 3:1. [PMID: 31463472 PMCID: PMC6713560 DOI: 10.28954/2019.csq.06.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This article relates the synthesis and characterization of novel heterobimetallic complexes containing a low-valent lanthanide, a tetradentate redox non-innocent ligand, viz. the 4,5,9,10-tetraazaphenanthrene, taphen ligand and transition metal fragments of PdMe2 and PtMe2. The experimental results are supported by a theoretical study. Investigation of their reduction properties allowed the formation of isostructural original heterotrimetallic complexes containing two Cp*2Yb fragments and the (taphen)MMe2 (M = Pd and Pt) motifs. These complexes are stable in non-coordinating solvent such as toluene but decompose in coordinating solvents such as thf. Investigation of the internal electron transfer shows that the taphen ligand behaves as a two-electrons reservoir but is capable of transferring back only one electron in thf. This reversible electron(s) transfer is rare in organolanthanide chemistry and show the potential interest of these complexes in reductive chemistry. Additionally, the trinuclear complexes feature odd X-ray crystal structures in which a deviation of symmetry is observed. The latter observation was studied in depth using quantum chemistry calculations highlighting the role of non-covalent weak interactions.
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Affiliation(s)
- Arnaud Jaoul
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
| | - Maxime Tricoire
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
| | - Jules Moutet
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
| | - Marie Cordier
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
| | - Carine Clavaguéra
- Laboratoire de Chimie Physique, CNRS-Université Paris-Sud, Université Paris-Saclay, 15 avenue Jean Perrin, 91405 Orsay Cedex, France
| | - Grégory Nocton
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
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18
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Halbach RL, Nocton G, Booth CH, Maron L, Andersen RA. Cerium Tetrakis(tropolonate) and Cerium Tetrakis(acetylacetonate) Are Not Diamagnetic but Temperature-Independent Paramagnets. Inorg Chem 2018; 57:7290-7298. [PMID: 29863340 DOI: 10.1021/acs.inorgchem.8b00928] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new synthesis of cerium tetrakis(tropolonate), Ce(trop)4, where trop is deprotonated 2-hydroxy-2,4,6-cycloheptatrienone) or Ce(O2C7H5)4, is developed that results in dark-purple crystals whose X-ray crystal structure shows that the geometry of the eight-coordinate compound closely resembles a D2 d dodecahedron, based on shape parameters. The magnetic susceptibility as a function of the temperature (4-300 K) shows that it is a temperature-independent paramagnet, χ = 1.2(3) × 10-4 emu/mol, and the LIII-edge X-ray absorption near-edge structure spectrum shows that the molecule is multiconfigurational, comprised of a f1:f0 configuration mixture in a 50:50 ratio. Ce(acac)4 and Ce(tmtaa)2 (where acac is acetylacetonate and tmtaaH2 is tetramethyldibenzotetraaza[14]annulene) have similar physical properties, as does the solid-state compound CeO2. The concept is advanced that trop-, acac-, tmtaa2-, cot2-, and O2- are redox-active ligands that function as electron donors, rendering the classification of these compounds according to their oxidation numbers misleading because their magnetic susceptibilities, χ, are positive and their effective magnetic moments, μeff, lie in the range of 0.1-0.7 μB at 300 K.
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Affiliation(s)
- Robert L Halbach
- Department of Chemistry , University of California , Berkeley , California 94720 , United States
| | - Grégory Nocton
- Department of Chemistry , University of California , Berkeley , California 94720 , United States.,Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.,LCM, CNRS , Ecole Polytechnique, Université Paris Saclay , 91128 Palaiseau , France
| | - Corwin H Booth
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Laurent Maron
- LPCNO, UMR 5215, CNRS, INSA, UPS , Université de Toulouse , 31000 Toulouse , France
| | - Richard A Andersen
- Department of Chemistry , University of California , Berkeley , California 94720 , United States.,Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
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19
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Trifonov AA, Mahrova TV, Luconi L, Giambastiani G, Lyubov DM, Cherkasov AV, Sorace L, Louyriac E, Maron L, Lyssenko KA. Steric control in the metal–ligand electron transfer of iminopyridine–ytterbocene complexes. Dalton Trans 2018; 47:1566-1576. [DOI: 10.1039/c7dt04299j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A systematic study of reactions between Cp*2Yb(THF) and iminopyridine ligands featuring similar electron accepting properties but variable denticity and steric demand, has provided a new example of steric control on the redox chemistry of ytterbocenes.
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Affiliation(s)
- Alexander A. Trifonov
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- 603950 Nizhny Novgorod
- Russia
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences
- Moscow
| | - Tatyana V. Mahrova
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- 603950 Nizhny Novgorod
- Russia
| | - Lapo Luconi
- Istituto di ChimicadeiCompostiOrganometallici (ICCOM - CNR)
- Sesto Fiorentino
- Italy
| | - Giuliano Giambastiani
- Istituto di ChimicadeiCompostiOrganometallici (ICCOM - CNR)
- Sesto Fiorentino
- Italy
- Kazan Federal University
- 420008 Kazan
| | - Dmitry M. Lyubov
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- 603950 Nizhny Novgorod
- Russia
| | - Anton V. Cherkasov
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- 603950 Nizhny Novgorod
- Russia
| | - Lorenzo Sorace
- Dipartimento di Chimica “U. Schiff” and UdR INSTM
- Università di Firenze
- 50019 Sesto Fiorentino
- Italy
| | | | - Laurent Maron
- Université de Toulouse
- INSA
- UPS
- CNRS-UMR5215
- 31077 Toulouse
| | - Konstantin A. Lyssenko
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences
- Moscow
- Russia
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20
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Goudy V, Jaoul A, Cordier M, Clavaguéra C, Nocton G. Tuning the Stability of Pd(IV) Intermediates Using a Redox Non-innocent Ligand Combined with an Organolanthanide Fragment. J Am Chem Soc 2017; 139:10633-10636. [PMID: 28741942 PMCID: PMC5553092 DOI: 10.1021/jacs.7b05634] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The unique combination of a divalent
organolanthanide fragment,
Cp*2Yb, with bipyrimidine (bipym) and a palladium
bis-alkyl fragment, PdMe2, allows the rapid formation and
stabilization of a PdIV tris-alkyl moiety after oxidative
addition with MeI. The crucial role of the organolanthanide
fragment is demonstrated by the substitution of bipym by the 4,5,9,10-tetraazaphenanthrene
ligand, which drastically modifies the electronic structure and tunes
the stability of the PdIV species.
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Affiliation(s)
- Violaine Goudy
- LCM, CNRS, Ecole polytechnique, Université Paris-Saclay , Route de Saclay, 91128 Palaiseau Cedex, France
| | - Arnaud Jaoul
- LCM, CNRS, Ecole polytechnique, Université Paris-Saclay , Route de Saclay, 91128 Palaiseau Cedex, France
| | - Marie Cordier
- LCM, CNRS, Ecole polytechnique, Université Paris-Saclay , Route de Saclay, 91128 Palaiseau Cedex, France
| | - Carine Clavaguéra
- Laboratoire de Chimie Physique, CNRS - Université Paris-Sud, Université Paris-Saclay , 15 avenue Jean Perrin, 91405 Orsay Cedex, France
| | - Grégory Nocton
- LCM, CNRS, Ecole polytechnique, Université Paris-Saclay , Route de Saclay, 91128 Palaiseau Cedex, France
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21
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Xémard M, Jaoul A, Cordier M, Molton F, Cador O, Le Guennic B, Duboc C, Maury O, Clavaguéra C, Nocton G. Divalent Thulium Triflate: A Structural and Spectroscopic Study. Angew Chem Int Ed Engl 2017; 56:4266-4271. [DOI: 10.1002/anie.201700576] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Mathieu Xémard
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
| | - Arnaud Jaoul
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
| | - Marie Cordier
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
| | - Florian Molton
- Département de Chimie Moléculaire; Grenoble Université, CNRS; Avenue de la Chimie Saint Martin d'Hères France
| | - Olivier Cador
- Institut des Sciences Chimique de Rennes, UMR 6226 CNRS; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
| | - Boris Le Guennic
- Institut des Sciences Chimique de Rennes, UMR 6226 CNRS; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
| | - Carole Duboc
- Département de Chimie Moléculaire; Grenoble Université, CNRS; Avenue de la Chimie Saint Martin d'Hères France
| | - Olivier Maury
- Univ Lyon, ENS Lyon, CNRS; Université Claude Bernard Lyon 1, UMR 5182, Laboratoire de Chimie; 69342 Lyon France
| | - Carine Clavaguéra
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
- Laboratoire de Chimie Physique, CNRS; Université Paris Sud, Université Paris-Saclay; 15 avenue Jean Perrin 91405 Orsay cedex France
| | - Grégory Nocton
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
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22
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Xémard M, Jaoul A, Cordier M, Molton F, Cador O, Le Guennic B, Duboc C, Maury O, Clavaguéra C, Nocton G. Divalent Thulium Triflate: A Structural and Spectroscopic Study. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700576] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Mathieu Xémard
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
| | - Arnaud Jaoul
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
| | - Marie Cordier
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
| | - Florian Molton
- Département de Chimie Moléculaire; Grenoble Université, CNRS; Avenue de la Chimie Saint Martin d'Hères France
| | - Olivier Cador
- Institut des Sciences Chimique de Rennes, UMR 6226 CNRS; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
| | - Boris Le Guennic
- Institut des Sciences Chimique de Rennes, UMR 6226 CNRS; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
| | - Carole Duboc
- Département de Chimie Moléculaire; Grenoble Université, CNRS; Avenue de la Chimie Saint Martin d'Hères France
| | - Olivier Maury
- Univ Lyon, ENS Lyon, CNRS; Université Claude Bernard Lyon 1, UMR 5182, Laboratoire de Chimie; 69342 Lyon France
| | - Carine Clavaguéra
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
- Laboratoire de Chimie Physique, CNRS; Université Paris Sud, Université Paris-Saclay; 15 avenue Jean Perrin 91405 Orsay cedex France
| | - Grégory Nocton
- LCM, Ecole polytechnique, CNRS; Université Paris-Saclay; Route de Saclay 91128 Palaiseau cedex France
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23
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Rosenzweig MW, Heinemann FW, Maron L, Meyer K. Molecular and Electronic Structures of Eight-Coordinate Uranium Bipyridine Complexes: A Rare Example of a Bipy2– Ligand Coordinated to a U4+ Ion. Inorg Chem 2017; 56:2792-2800. [DOI: 10.1021/acs.inorgchem.6b02954] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael W. Rosenzweig
- Department
of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen−Nürnberg (FAU), Egerlandstrasse 1, 91058 Erlangen, Germany
| | - Frank W. Heinemann
- Department
of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen−Nürnberg (FAU), Egerlandstrasse 1, 91058 Erlangen, Germany
| | - Laurent Maron
- LPCNO, Université de Toulouse, INSA Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Karsten Meyer
- Department
of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen−Nürnberg (FAU), Egerlandstrasse 1, 91058 Erlangen, Germany
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24
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Annibale VT, Song D. Coordination chemistry and applications of versatile 4,5-diazafluorene derivatives. Dalton Trans 2016; 45:32-49. [DOI: 10.1039/c5dt03665h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This review article highlights the versatile nature of 4,5-diazafluorene derivatives as ligands, and details some recent advances made using this ligand family.
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Affiliation(s)
- Vincent T. Annibale
- Davenport Chemical Research Laboratories
- Department of Chemistry
- University of Toronto
- Toronto
- Canada M5S 3H6
| | - Datong Song
- Davenport Chemical Research Laboratories
- Department of Chemistry
- University of Toronto
- Toronto
- Canada M5S 3H6
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25
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Cheisson T, Auffrant A, Nocton G. η5–η1 Switch in Divalent Phosphaytterbocene Complexes with Neutral Iminophosphoranyl Pincer Ligands: Solid-State Structures and Solution NMR 1JYb–P Coupling Constants. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00814] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thibault Cheisson
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
| | - Audrey Auffrant
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
| | - Grégory Nocton
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
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26
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Kefalidis CE, Perrin L, Burns CJ, Berg DJ, Maron L, Andersen RA. Can a pentamethylcyclopentadienyl ligand act as a proton-relay in f-element chemistry? Insights from a joint experimental/theoretical study. Dalton Trans 2015; 44:2575-87. [PMID: 25340677 DOI: 10.1039/c4dt02387k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Isomerisation of buta-1,2-diene to but-2-yne by (Me(5)C(5))(2)Yb is a thermodynamically favourable reaction, with the Δ(r)G° estimated from experimental data at 298 K to be -3.0 kcal mol(-1). It proceeds in hydrocarbon solvents with a pseudo first-order rate constant of 6.4 × 10(-6) s(-1) and 7.4 × 10(-5) s(-1) in C(6)D(12) and C(6)D(6), respectively, at 20 °C. This 1,3-hydrogen shift is formally forbidden by symmetry and has to occur by an alternative pathway. The proposed mechanism for buta-1,2-diene to but-2-yne isomerisation by (Me(5)C(5))(2)Yb involves coordination of methylallene (buta-1,2-diene) to (Me(5)C(5))(2)Yb, and deprotonation of methylallene by one of the Me(5)C(5) ligands followed by protonation of the terminal methylallenyl carbon to yield the known coordination compound (Me(5)C(5))(2)Yb(η(2)-MeC[triple bond, length as m-dash]CMe). Computationally, this mechanism is not initiated by a single electron transfer step, and the ytterbium retains its oxidation state (II) throughout the reactivity. Experimentally, the influence of the metal centre is discussed by comparison with the reaction of (Me(5)C(5))(2)Ca towards buta-1,2-diene, and (Me(5)C(5))(2)Yb with ethylene. The mechanism by which the Me(5)C(5) acts as a proton-relay within the coordination sphere of a metal also rationalises the reactivity of (i) (Me(5)C(5))(2)Eu(OEt(2)) with phenylacetylene, (ii) (Me(5)C(5))(2)Yb(OEt(2)) with phenylphosphine and (iii) (Me(5)C(5))(2)U(NPh)(2) with H(2) to yield (Me(5)C(5))(2)U(HNPh)(2). In the latter case, the computed mechanism is the heterolytic activation of H(2) by (Me(5)C(5))(2)U(NPh)(2) to yield (Me(5)C(5))(2)U(H)(HNPh)(NPh), followed by a hydrogen transfer from uranium back to the imido nitrogen atom using one Me(5)C(5) ligand as a proton-relay. The overall mechanism by which hydrogen shifts using a pentamethylcyclopentadienyl ligand as a proton-relay is named Carambole in reference to carom billiards.
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Affiliation(s)
- Christos E Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France.
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27
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Edelmann FT. Lanthanides and actinides: Annual survey of their organometallic chemistry covering the year 2013. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.09.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Nocton G, Ricard L. Reversible C–C coupling in phenanthroline complexes of divalent samarium and thulium. Chem Commun (Camb) 2015; 51:3578-81. [DOI: 10.1039/c5cc00289c] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The phenanthroline adducts of organosamarium and organothulium fragments feature a reversible C–C bond on the phenanthroline ligand.
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Affiliation(s)
- Grégory Nocton
- Laboratoire de Chimie Moléculaire
- CNRS
- Ecole polytechnique
- Palaiseau
- France
| | - Louis Ricard
- Laboratoire de Chimie Moléculaire
- CNRS
- Ecole polytechnique
- Palaiseau
- France
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29
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Nocton G, Booth CH, Maron L, Ricard L, Andersen RA. Carbon–Hydrogen Bond Breaking and Making in the Open-Shell Singlet Molecule Cp*2Yb(4,7-Me2phen). Organometallics 2014. [DOI: 10.1021/om500843z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Grégory Nocton
- Laboratoire
de Chimie Moléculaire, CNRS, Ecole Polytechnique, Route
de Saclay, 91128 Palaiseau, France
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Corwin H. Booth
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Laurent Maron
- LPCNO,
UMR 5215, Université de Toulouse-CNRS, INSA, UPS, 31000 Toulouse, France
| | - Louis Ricard
- Laboratoire
de Chimie Moléculaire, CNRS, Ecole Polytechnique, Route
de Saclay, 91128 Palaiseau, France
| | - Richard A. Andersen
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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30
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Kefalidis CE, Stasch A, Jones C, Maron L. On the mechanism of the reaction of a magnesium(I) complex with CO₂: a concerted type of pathway. Chem Commun (Camb) 2014; 50:12318-21. [PMID: 25182965 DOI: 10.1039/c4cc04984e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Theoretical mechanistic calculations (DFT) on the reactivity of [{((Dip)Nacnac)Mg}2] ((Dip)Nacnac = [(DipNCMe)2CH](-), Dip = C6H3(i)Pr2-2,6) towards CO2 were carried out in order to rationalise the experimental formation of a carbonate (major product) and an oxalate (minor product). Despite its apparent similarity to f-element reactivity, the magnesium(I) bimetallic complex yields the carbonate through a concerted type of pathway rather than via a transient oxo-bridged intermediate. The latter is destabilised due to the electrostatic repulsion between the two magnesium centres. The small energy barrier difference between carbonate and oxalate formation (~10 kcal mol(-1)) may allow for the experimentally observed reactivity to be tuned by changing the sterics and/or electronic properties of the magnesium(I) complex.
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Affiliation(s)
- Christos E Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France.
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31
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Jacquot L, Xémard M, Clavaguéra C, Nocton G. Multiple One-Electron Transfers in Bipyridine Complexes of Bis(phospholyl) Thulium. Organometallics 2014. [DOI: 10.1021/om500607r] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Léa Jacquot
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, Route de Saclay, Palaiseau 91128, France
| | - Mathieu Xémard
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, Route de Saclay, Palaiseau 91128, France
| | - Carine Clavaguéra
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, Route de Saclay, Palaiseau 91128, France
| | - Grégory Nocton
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, Route de Saclay, Palaiseau 91128, France
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32
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Batcup R, Annibale VT, Song D. Heterodinuclear complexes of 4,5-diazafluorene derivatives displaying η(5),κ(2)-[N,N] and η(5),κ(1)-N coordination modes. Dalton Trans 2014; 43:8951-8. [PMID: 24803106 DOI: 10.1039/c4dt01165a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The syntheses and structures for a series of heterodinuclear complexes of 4,5-diazafluorenyl (L(-)) and 3,6-dimesityl-4,5-diazafluorenyl (LMes(-)) ligands are reported herein. In all these heterodinuclear complexes, the Ru(II) centre is sandwiched between a pentamethylcyclopentadienyl (Cp*) ligand and the C5 ring of L(-) or LMes(-) in a double η(5) fashion, while the other metal (Fe(II), Co(II), Pt(II), or Cu(I)) is bound to the N-donors.
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Affiliation(s)
- Rhys Batcup
- Davenport Chemical Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6.
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33
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Nocton G, Lukens WW, Booth CH, Rozenel SS, Medling SA, Maron L, Andersen RA. Reversible sigma C-C bond formation between phenanthroline ligands activated by (C5Me5)2Yb. J Am Chem Soc 2014; 136:8626-41. [PMID: 24852897 DOI: 10.1021/ja502271q] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The electronic structure and associated magnetic properties of the 1,10-phenanthroline adducts of Cp*2Yb are dramatically different from those of the 2,2'-bipyridine adducts. The monomeric phenanthroline adducts are ground state triplets that are based upon trivalent Yb(III), f(13), and (phen(•-) ) that are only weakly exchange coupled, which is in contrast to the bipyridine adducts whose ground states are multiconfigurational, open-shell singlets in which ytterbium is intermediate valent ( J. Am. Chem. Soc 2009 , 131 , 6480 ; J. Am. Chem. Soc 2010 , 132 , 17537 ). The origin of these different physical properties is traced to the number and symmetry of the LUMO and LUMO+1 of the heterocyclic diimine ligands. The bipy(•-) has only one π*1 orbital of b1 symmetry of accessible energy, but phen(•-) has two π* orbitals of b1 and a2 symmetry that are energetically accessible. The carbon pπ-orbitals have different nodal properties and coefficients and their energies, and therefore their populations change depending on the position and number of methyl substitutions on the ring. A chemical ramification of the change in electronic structure is that Cp*2Yb(phen) is a dimer when crystallized from toluene solution, but a monomer when sublimed at 180-190 °C. When 3,8-Me2phenanthroline is used, the adduct Cp*2Yb(3,8-Me2phen) exists in the solution in a dimer-monomer equilibrium in which ΔG is near zero. The adducts with 3-Me, 4-Me, 5-Me, 3,8-Me2, and 5,6-Me2-phenanthroline are isolated and characterized by solid state X-ray crystallography, magnetic susceptibility and LIII-edge XANES spectroscopy as a function of temperature and variable-temperature (1)H NMR spectroscopy.
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Affiliation(s)
- Grégory Nocton
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique , Palaiseau, France
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34
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Kefalidis CE, Essafi S, Perrin L, Maron L. Qualitative Estimation of the Single-Electron Transfer Step Energetics Mediated by Samarium(II) Complexes: A “SOMO–LUMO Gap” Approach. Inorg Chem 2014; 53:3427-33. [DOI: 10.1021/ic402837n] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Christos E. Kefalidis
- Université de Toulouse et CNRS, INSA, UPS, CNRS,
UMR 5215, LPCNO, 135 Avenue
de Rangueil, F-31077 Toulouse, France
| | - Stéphanie Essafi
- School of Chemistry and
Centre for Computational Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Lionel Perrin
- Université de Toulouse et CNRS, INSA, UPS, CNRS,
UMR 5215, LPCNO, 135 Avenue
de Rangueil, F-31077 Toulouse, France
| | - Laurent Maron
- Université de Toulouse et CNRS, INSA, UPS, CNRS,
UMR 5215, LPCNO, 135 Avenue
de Rangueil, F-31077 Toulouse, France
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35
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Nocton G, Ricard L. N-aromatic heterocycle adducts of bulky [1,2,4-(Me3C)3C5H2]2Sm: synthesis, structure and solution analysis. Dalton Trans 2014; 43:4380-7. [DOI: 10.1039/c3dt52641k] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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36
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Nocton G, Booth CH, Maron L, Andersen RA. Influence of the Torsion Angle in 3,3′-Dimethyl-2,2′-bipyridine on the Intermediate Valence of Yb in (C5Me5)2Yb(3,3′-Me2-bipy). Organometallics 2013. [DOI: 10.1021/om400528d] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Grégory Nocton
- Laboratoire Hétéroéléments
et Coordination, CNRS, Ecole Polytechnique, Route de Saclay, 91128 Palaiseau, France
- Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
| | - Corwin H. Booth
- Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Laurent Maron
- LPCNO, UMR 5215,
Université de Toulouse-CNRS, INSA, UPS, Toulouse, France
| | - Richard A. Andersen
- Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
- LPCNO, UMR 5215,
Université de Toulouse-CNRS, INSA, UPS, Toulouse, France
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37
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Mrutu A, Barnes CL, Bart SC, Walensky JR. Bringing Redox Reactivity to a Redox Inactive Metal Center - E-I (E = C, Si) Bond Cleavage with a Thorium Bis(α-diimine) Complex. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300390] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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