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Nguyen BX, VandeVen W, MacNeil GA, Zhou W, Paterson AR, Walsby CJ, Chiang L. High-Valent Ni and Cu Complexes of a Tetraanionic Bis(amidateanilido) Ligand. Inorg Chem 2023; 62:15180-15194. [PMID: 37676794 DOI: 10.1021/acs.inorgchem.3c02358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
High-valent metal species are often invoked as intermediates during enzymatic and synthetic catalytic cycles. Anionic donors are often required to stabilize such high-valent states by forming strong bonds with the Lewis acidic metal centers while decreasing their oxidation potentials. In this report, we discuss the synthesis of two high-valent metal complexes [ML]+ in which the NiIII and CuIII centers are ligated by a new tetradentate, tetraanionic bis(amidateanilido) ligand. [ML]+, obtained via chemical oxidation of ML, exhibits UV-vis-NIR, EPR, and XANES spectra characteristic of square planar, high-valent MIII species, suggesting the locus of oxidation for both [ML]+ is predominantly metal-based. This is supported by theoretical analyses, which also support the observed visible transitions as ligand-to-metal charge transfer transitions characteristic of square planar, high-valent MIII species. Notably, [ML]+ can also be obtained via O2 oxidation of ML due to its remarkably negative oxidation potentials (CuL/[CuL]+: -1.16 V, NiL/[NiL]+: -1.01 V vs Fc/Fc+ in MeCN). This demonstrates the exceptionally strong donating nature of the tetraanionic bis(amidateanilido) ligation and its ability to stabilize high-valent metal centers..
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Affiliation(s)
- Bach X Nguyen
- Department of Chemistry, University of the Fraser Valley, Abbotsford, British Columbia V2S 7M8, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Warren VandeVen
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Gregory A MacNeil
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Wen Zhou
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Alisa R Paterson
- Canadian Light Source, 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2 V3, Canada
| | - Charles J Walsby
- Department of Chemistry, Simon Fraser University, Burnaby, British Columba V5A 1S6, Canada
| | - Linus Chiang
- Department of Chemistry, University of the Fraser Valley, Abbotsford, British Columbia V2S 7M8, Canada
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2
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García-Garrido SE, Presa Soto A, García-Álvarez J. Iminophosphoranes (R3P NR′): From terminal to multidentate ligands in organometallic chemistry. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2022. [DOI: 10.1016/bs.adomc.2022.01.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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3
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Oheix E, Herrero C, Moutet J, Rebilly JN, Cordier M, Guillot R, Bourcier S, Banse F, Sénéchal-David K, Auffrant A. Fe III and Fe II Phosphasalen Complexes: Synthesis, Characterization, and Catalytic Application for 2-Naphthol Oxidative Coupling. Chemistry 2020; 26:13634-13643. [PMID: 32463553 DOI: 10.1002/chem.202001662] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Indexed: 01/14/2023]
Abstract
We report on the synthesis and characterization of three iron(III) phosphasalen complexes, [FeIII (Psalen)(X)] differing in the nature of the counter-anion/exogenous ligand (X- =Cl- , NO3 - , OTf- ), as well as the neutral iron(II) analogue, [FeII (Psalen)]. Phosphasalen (Psalen) differs from salen by the presence of iminophosphorane (P=N) functions in place of the imines. All the complexes were characterized by single-crystal X-ray diffraction, UV/Vis, EPR, and cyclic voltammetry. The [FeII (Psalen)] complex was shown to remain tetracoordinated even in coordinating solvent but surprisingly exhibits a magnetic moment in line with a FeII high-spin ground state. For the FeIII complexes, the higher lability of triflate anion compared to nitrate was demonstrated. As they exhibit lower reduction potentials compared to their salen analogues, these complexes were tested for the coupling of 2-naphthol using O2 from air as oxidant. In order to shed light on this reaction, the interaction between 2-naphthol and the FeIII (Psalen) complexes was studied by cyclic voltammetry as well as UV/Vis spectroscopy.
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Affiliation(s)
- Emmanuel Oheix
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France.,CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Christian Herrero
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Jules Moutet
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
| | - Jean-Noël Rebilly
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Marie Cordier
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
| | - Régis Guillot
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Sophie Bourcier
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
| | - Frédéric Banse
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Katell Sénéchal-David
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Audrey Auffrant
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
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4
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Shoshani MM, Agapie T. Ligand architecture for triangular metal complexes: a high oxidation state Ni 3 cluster with proximal metal arrangement. Chem Commun (Camb) 2020; 56:11279-11282. [PMID: 32832943 DOI: 10.1039/d0cc03816d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new multidentate tetraanionic ligand platform for supporting trinuclear transition metal clusters has been developed. Two trisphenoxide phosphinimide ligands bind three Ni centers in a triangular arrangement. The phosphinimide donors bridge in μ3 fashion and the phenoxides complete a pseudo-square planar coordination sphere around each metal center. Electrochemical studies reveal two pseudo-reversible oxidation events at notably low potentials (-0.80 V and +0.05 V). The one electron oxidized species was characterized structurally, and it is assigned as a NiIII-containing cluster.
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Affiliation(s)
- Manar M Shoshani
- Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
| | - Theodor Agapie
- Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
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5
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Jacob SI, Douair I, Wu G, Maron L, Ménard G. A tetranuclear nickel cluster isolated in multiple high-valent states. Chem Commun (Camb) 2020; 56:8182-8185. [PMID: 32293617 DOI: 10.1039/d0cc01699c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a series of high-valent tetranuclear nickel clusters isolated from the chemical oxidation of an all Ni(ii) ([Ni4]) neutral cluster. Electrochemical analysis of [Ni4] reveals three reversible sequential oxidations at 0.248 V (1e-), 0.678 V (1e-), and 0.991 V (2e-) vs. Fc/Fc+ corresponding to mono-, di-, and tetra-oxidized species, [Ni4]+, [Ni4]2+, [Ni4]4+, respectively. Using spectroscopic, crystallographic, magnetometric, and computational techniques, we assign the primary loci of oxidations to the Ni centers in each case, thus resulting in the isolation of the first tetranuclear all-Ni(iii) cluster, [Ni4]4+.
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Affiliation(s)
- Samuel I Jacob
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106, USA.
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6
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Xing X, Zhang S, Thierer LM, Gau MR, Carroll PJ, Tomson NC. Reversible nickel-metallacycle formation with a phosphinimine-based pincer ligand. Dalton Trans 2020; 49:7796-7806. [PMID: 32459241 PMCID: PMC7370460 DOI: 10.1039/d0dt01118e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pincer ligands have a remarkable ability to impart control over small molecule activation chemistry and catalytic activity; therefore, the design of new pincer ligands and the exploration of their reactivity profiles continues to be a frontier in synthetic inorganic chemistry. In this work, a novel, monoanionic NNN pincer ligand containing two phosphinimine donors was used to create a series of mononuclear Ni complexes. Ligand metallation in the presence of NaOPh yielded a nickel phenoxide complex that was used to form a mononuclear hydride complex on treatment with pinacolborane. Attempts at ligand metallation with NaN(SiMe3)2 resulted in the activation of both phosphinimine methyl groups to yield an anionic, cis-dialkyl product, in which dissociation of one phosphinimine nitrogen leads to retention of a square planar coordination environment about Ni. Protonolysis of this dialkyl species generated a monoalkyl product that retained the 4-membered metallacycle. The insertion of 2,6-dimethylphenyl isocyanide (xylNC) into this nickel metallacycle, followed by proton transfer, generated a new five-membered nickel metallacycle. Kinetic studies suggested rate-limiting proton transfer (KIE ≥ 3.9 ± 0.5) from the α-methylene unit of the putative iminoacyl intermediate.
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Affiliation(s)
- Xiujing Xing
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, PA 19104, USA.
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7
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Mews NM, Reimann M, Hörner G, Kaupp M, Schubert H, Berkefeld A. A four-parameter system for rationalising the electronic properties of transition metal–radical ligand complexes. Dalton Trans 2020; 49:9735-9742. [DOI: 10.1039/d0dt02237c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A heuristic four-parameter scheme captures and predicts the electronic properties of radical-ligand transition metal compounds, overcoming ligand specific descriptions.
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Affiliation(s)
- N. M. Mews
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| | - M. Reimann
- Institut für Chemie
- Theoretical Chemistry–Quantum Chemistry
- Technische Universität Berlin
- 10623 Berlin
- Germany
| | - G. Hörner
- Anorganische Chemie IV
- Universität Bayreuth
- 95440 Bayreuth
- Germany
| | - M. Kaupp
- Institut für Chemie
- Theoretical Chemistry–Quantum Chemistry
- Technische Universität Berlin
- 10623 Berlin
- Germany
| | - H. Schubert
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| | - A. Berkefeld
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
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8
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Yuntawattana N, McGuire TM, Durr CB, Buchard A, Williams CK. Indium phosphasalen catalysts showing high isoselectivity and activity in racemic lactide and lactone ring opening polymerizations. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01484b] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Study of a series of phosphasalen indium alkoxide complexes reveals that the substitution pattern at the phosphorus atoms can deliver outstanding isoselectivity with high rates.
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Affiliation(s)
| | | | - Christopher B. Durr
- Chemistry Research Laboratory
- Department of Chemistry
- University of Oxford
- Oxford
- UK
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9
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Rajpurohit J, Shukla P, Kumar P, Das C, Vaidya S, Sundararajan M, Shanmugam M, Shanmugam M. Stabilizing Terminal Ni(III)-Hydroxide Complex Using NNN-Pincer Ligands: Synthesis and Characterization. Inorg Chem 2019; 58:6257-6267. [PMID: 31009214 DOI: 10.1021/acs.inorgchem.9b00466] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of [Ni(COD)2] (COD; cyclooctadiene) in THF with the NNN-pincer ligand bis(imino)pyridyl (L1) reveals a susceptibility to oxidation in an inert atmosphere ([O2] level <0.5 ppm), resulting in a transient Ni:dioxygen adduct. This reactive intermediate abstracts a hydrogen atom from THF and stabilizes an uncommon Ni(III) complex. The complex is crystallographically characterized by a molecular formula of [NiIII(L1··)2-(OH)] (1). Various isotopically labeled experiments (16O/18O) assertively endorse the origin of terminal oxygen based ligand in 1 due to the activation of molecular dioxygen. The presence of proton bound to the terminal oxygen in 1 is well supported by NMR, IR spectroscopy, DFT calculations, and hydrogen atom transfer (HAT) reactions promoted by 1. The observation of shakeup satellite peaks for the primary photoelectron lines of Ni(2p) in the X-ray photoelectron spectroscopy (XPS) unambiguously confirms the paramagnetic signature associated with the distorted square planar nickel ion, which is consistent with the trivalent oxidation state assigned for the nickel ion in 1. The variable temperature magnetic susceptibility data of 1 shows dominant antiferromagnetic interactions exist among the paramagnetic centers, resulting in an overall S = 1/2 ground state. Variable temperature X-band EPR studies performed on 1 show evidence for the S = 1/2 ground state, which is consistent with magnetic data. The unusual g-tensor extracted for the ground state S = 1/2 is analyzed under a strong exchange limit of spin-coupled centers. The electronic structure predicted for 1 is in good agreement with theoretical calculations.
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Affiliation(s)
- Jitendrasingh Rajpurohit
- Department of Chemistry , Indian Institute of Technology Bombay , Powai - 400076 , Mumbai , Maharashtra , India
| | - Pragya Shukla
- Department of Chemistry , Indian Institute of Technology Bombay , Powai - 400076 , Mumbai , Maharashtra , India
| | - Pardeep Kumar
- Department of Chemistry , Indian Institute of Technology Bombay , Powai - 400076 , Mumbai , Maharashtra , India
| | - Chinmoy Das
- Department of Chemistry , Indian Institute of Technology Bombay , Powai - 400076 , Mumbai , Maharashtra , India
| | - Shefali Vaidya
- Department of Chemistry , Indian Institute of Technology Bombay , Powai - 400076 , Mumbai , Maharashtra , India
| | - Mahesh Sundararajan
- Theoretical Chemistry Section , Bhabha Atomic Research Centre , Mumbai - 400 085 , India
| | - Muralidharan Shanmugam
- Manchester Institute of Biotechnology , The University of Manchester , 131 Princes Street , Manchester - M1 7DN , U.K
| | - Maheswaran Shanmugam
- Department of Chemistry , Indian Institute of Technology Bombay , Powai - 400076 , Mumbai , Maharashtra , India
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10
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Mews NM, Hörner G, Schubert H, Berkefeld A. Tuning of Thiyl/Thiolate Complex Near-Infrared Chromophores of Platinum through Geometrical Constraints. Inorg Chem 2018; 57:9670-9682. [PMID: 29561154 DOI: 10.1021/acs.inorgchem.8b00122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The chemistry of radical-ligand complexes of the transition metals has developed into a vibrant field of research that spans from fundamental studies on the relationship between the chemical and electronic structures to applications in catalysis and functional materials chemistry. In general, fine-tuning of the relevant properties relies on an increasingly diversifying pool of radical-proligand structures. Surprisingly, the variability of the conformational freedom and the number of distinct bonding modes supported by many radical proligands is limited. This work reports on the angular constraints and relative geometric alignment of metal and ligand orbitals as key parameters that render a series of chemically similar thiyl/thiolate complexes of platinum(II) electronically and spectroscopically distinct. The use of conformational flexible thiophenols as primary ligand scaffolds is essential to establishing a defined radical-ligand [(areneS)2PtII]•+ core whose electronic structure is modulated by a series of auxiliary coligands at platinum.
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Affiliation(s)
- Nicole M Mews
- Institut für Anorganische Chemie , Eberhard Karls Universität Tübingen , Auf der Morgenstelle 18 , 72076 Tübingen , Germany
| | - Gerald Hörner
- Institut für Chemie, Quantenchemie und Bioanorganische Chemie , Technische Universität (TU) Berlin , Straße des 17 Juni 135 , 10623 Berlin , Germany
| | - Hartmut Schubert
- Institut für Anorganische Chemie , Eberhard Karls Universität Tübingen , Auf der Morgenstelle 18 , 72076 Tübingen , Germany
| | - Andreas Berkefeld
- Institut für Anorganische Chemie , Eberhard Karls Universität Tübingen , Auf der Morgenstelle 18 , 72076 Tübingen , Germany
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11
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Cheisson T, Ricard L, Heinemann FW, Meyer K, Auffrant A, Nocton G. Synthesis and Reactivity of Low-Valent f-Element Iodide Complexes with Neutral Iminophosphorane Ligands. Inorg Chem 2018; 57:9230-9240. [DOI: 10.1021/acs.inorgchem.8b01259] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Thibault Cheisson
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| | - Louis Ricard
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| | - Frank W. Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Audrey Auffrant
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| | - Grégory Nocton
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
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12
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Thevenon A, Cyriac A, Myers D, White AJP, Durr CB, Williams CK. Indium Catalysts for Low-Pressure CO 2/Epoxide Ring-Opening Copolymerization: Evidence for a Mononuclear Mechanism? J Am Chem Soc 2018; 140:6893-6903. [PMID: 29782169 DOI: 10.1021/jacs.8b01920] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The alternating copolymerization of CO2/epoxides is a useful means to incorporate high levels of carbon dioxide into polymers. The reaction is generally proposed to occur by bimetallic or bicomponent pathways. Here, the first indium catalysts are presented, which are proposed to operate by a distinct mononuclear pathway. The most active and selective catalysts are phosphasalen complexes, which feature ligands comprising two iminophosphoranes linked to sterically hindered ortho-phenolates. The catalysts are active at 1 bar pressure of carbon dioxide and are most effective without any cocatalyst. They show low-pressure activity (1 bar pressure) and yield polymer with high carbonate linkage selectivity (>99%) and isoselectivity ( Pm > 70%). Using these complexes, it is also possible to isolate and characterize key catalytic intermediates, including the propagating indium alkoxide and carbonate complexes that are rarely studied. The catalysts are mononuclear under polymerization conditions, and the key intermediates show different coordination geometries: the alkoxide complex is pentacoordinate, while the carbonate is hexacoordinate. Kinetic analyses reveal a first-order dependence on catalyst concentration and are zero-order in carbon dioxide pressure; these findings together with in situ spectroscopic studies underpin the mononuclear pathway. More generally, this research highlights the future opportunity for other homogeneous catalysts, featuring larger ionic radius metals and new ligands, to operate by mononuclear mechanisms.
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Affiliation(s)
- Arnaud Thevenon
- Department of Chemistry , University of Oxford , 13 Mansfield Road , Oxford OX1 3TA , United Kingdom
| | - Anish Cyriac
- Department of Chemistry , Imperial College London , London SW7 2AZ , United Kingdom
| | - Dominic Myers
- Department of Chemistry , Imperial College London , London SW7 2AZ , United Kingdom
| | - Andrew J P White
- Department of Chemistry , Imperial College London , London SW7 2AZ , United Kingdom
| | - Christopher B Durr
- Department of Chemistry , University of Oxford , 13 Mansfield Road , Oxford OX1 3TA , United Kingdom
| | - Charlotte K Williams
- Department of Chemistry , University of Oxford , 13 Mansfield Road , Oxford OX1 3TA , United Kingdom
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13
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Marín IM, Auffrant A. Phosphasalen vs. Salen Ligands: What Does the Phosphorus Change? Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701210] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Irene Mustieles Marín
- LCM, CNRS-Ecole polytechnique; Université Paris-Saclay; F-91128 Palaiseau Cedex France
| | - Audrey Auffrant
- LCM, CNRS-Ecole polytechnique; Université Paris-Saclay; F-91128 Palaiseau Cedex France
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14
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Cheisson T, Mazaud L, Auffrant A. Ruthenium complexes featuring cooperative phosphine–pyridine–iminophosphorane (PNN) ligands: synthesis, reactivity and catalytic activity. Dalton Trans 2018; 47:14521-14530. [DOI: 10.1039/c8dt03488e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Ruthenium complexes with an iminophosphorane based (PNN) ligand; the NP substituent influences the coordination and the reactivity of the formed complexes.
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Affiliation(s)
- Thibault Cheisson
- LCM
- CNRS-Ecole polytechnique
- Université Paris-Saclay
- F-91128 Palaiseau Cedex
- France
| | - Louis Mazaud
- LCM
- CNRS-Ecole polytechnique
- Université Paris-Saclay
- F-91128 Palaiseau Cedex
- France
| | - Audrey Auffrant
- LCM
- CNRS-Ecole polytechnique
- Université Paris-Saclay
- F-91128 Palaiseau Cedex
- France
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15
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Mustieles Marín I, Cheisson T, Singh-Chauhan R, Herrero C, Cordier M, Clavaguéra C, Nocton G, Auffrant A. Electronic Structures of Mono-Oxidized Copper and Nickel Phosphasalen Complexes. Chemistry 2017; 23:17940-17953. [PMID: 28980736 DOI: 10.1002/chem.201703390] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Indexed: 11/11/2022]
Abstract
Non-innocent ligands render the determination of the electronic structure in metal complexes difficult. As such, a combination of experimental techniques and quantum chemistry are required to correctly elucidate them. This paper deals with the one-electron oxidation of copper(II) and nickel(II) complexes featuring a phosphasalen ligand (Psalen), which differs from salen analogues by the presence of iminophosphorane groups (P=N) instead of imines. Various experimental techniques (X-ray diffraction, cyclic voltammetry, NMR, EPR, and UV/Vis spectroscopies, and magnetic measurements) as well as quantum chemical calculations were used to define the electronic structure of the oxidized complexes. These can be modified by a small change in the ligand structure, that is, the replacement of a tert-butyl group by a methoxy on the phenoxide ring. The different techniques have allowed quantifying the amount of spin density located on the metal center and on the Psalen ligands. All complexes were found to possess a multi-configurational ground state, in which the ratio of the +II versus +III oxidation state of the metal center, and therefore the phenolate versus phenoxyl radical ligand character, varies upon the substituents. The tert-butyl group favors a strong localization on the metal center whereas with the methoxy group the metallic configurations decrease and the ligand configurations increase. The importance of the geometrical considerations compared with the electronic substituent effect is highlighted by the differences observed between the solid-state (EPR, magnetic measurements) and solution characterizations (EPR and NMR data).
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Affiliation(s)
- Irene Mustieles Marín
- LCM, CNRS-Ecole polytechnique, Université Paris-Saclay, 91128, Palaiseau Cedex, France
| | - Thibault Cheisson
- LCM, CNRS-Ecole polytechnique, Université Paris-Saclay, 91128, Palaiseau Cedex, France
| | - Rohit Singh-Chauhan
- LCM, CNRS-Ecole polytechnique, Université Paris-Saclay, 91128, Palaiseau Cedex, France
| | - Christian Herrero
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS-Univ. Paris-Sud, Univ. Paris Saclay, 91405, Orsay Cedex, France
| | - Marie Cordier
- LCM, CNRS-Ecole polytechnique, Université Paris-Saclay, 91128, Palaiseau Cedex, France
| | - Carine Clavaguéra
- LCM, CNRS-Ecole polytechnique, Université Paris-Saclay, 91128, Palaiseau Cedex, France.,Laboratoire de Chimie Physique, CNRS-Université Paris-Sud, Université Paris-Saclay, 15 avenue Jean Perrin, 91405, Orsay, France
| | - Grégory Nocton
- LCM, CNRS-Ecole polytechnique, Université Paris-Saclay, 91128, Palaiseau Cedex, France
| | - Audrey Auffrant
- LCM, CNRS-Ecole polytechnique, Université Paris-Saclay, 91128, Palaiseau Cedex, France
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16
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17
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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
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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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18
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CNRS Silver and Bronze Medals 2016 / Izatt-Christensen Award: H. F. Sleiman / Cram Lehn Pedersen Prize: I. Aprahamian. Angew Chem Int Ed Engl 2016; 55:6819-20. [DOI: 10.1002/anie.201604168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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Silber- und Bronzemedaillen des CNRS 2016 / Izatt-Christensen-Preis: H. F. Sleiman / Cram-Lehn-Pedersen-Preis: I. Aprahamian. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201604168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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20
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Thomas F. Ligand-centred oxidative chemistry in sterically hindered salen complexes: an interesting case with nickel. Dalton Trans 2016; 45:10866-77. [DOI: 10.1039/c6dt00942e] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Salen ligands are ubiquitous chelators, whose nickel complexes readily undergo a ligand-centred redox chemistry in non-coordinating solvents.
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Affiliation(s)
- F. Thomas
- Département de Chimie Moléculaire - Chimie Inorganique Redox (CIRE) - UMR CNRS 5250
- Université Grenoble-Alpes
- 38041 Grenoble cedex 9
- France
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21
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Cheisson T, Auffrant A. Palladium(ii) complexes featuring a mixed phosphine–pyridine–iminophosphorane pincer ligand: synthesis and reactivity. Dalton Trans 2016; 45:2069-78. [DOI: 10.1039/c5dt02789f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Cationic and neutral Pd complexes featuring an original phosphine–pyridine–iminophosphorane (PNN) ligand were synthesised. In particular, an unexpected borylated complex was isolated by reaction with B(C6F5)3.
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Affiliation(s)
- Thibault Cheisson
- Laboratoire de Chimie Moléculaire
- Ecole Polytechnique
- UMR CNRS 9168
- F-91128 Palaiseau Cedex
- France
| | - Audrey Auffrant
- Laboratoire de Chimie Moléculaire
- Ecole Polytechnique
- UMR CNRS 9168
- F-91128 Palaiseau Cedex
- France
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22
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Cazacu M, Shova S, Soroceanu A, Machata P, Bucinsky L, Breza M, Rapta P, Telser J, Krzystek J, Arion VB. Charge and Spin States in Schiff Base Metal Complexes with a Disiloxane Unit Exhibiting a Strong Noninnocent Ligand Character: Synthesis, Structure, Spectroelectrochemistry, and Theoretical Calculations. Inorg Chem 2015; 54:5691-706. [DOI: 10.1021/acs.inorgchem.5b00229] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Maria Cazacu
- “Petru Poni” Institute of Macromolecular Chemistry, Alea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Sergiu Shova
- “Petru Poni” Institute of Macromolecular Chemistry, Alea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Alina Soroceanu
- “Petru Poni” Institute of Macromolecular Chemistry, Alea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Peter Machata
- Institute of Physical Chemistry and Chemical Physics, Faculty of
Chemical and Food Technology, Slovak University of Technology, Radlinského
9, SK-81237 Bratislava, Slovak Republic
| | - Lukas Bucinsky
- Institute of Physical Chemistry and Chemical Physics, Faculty of
Chemical and Food Technology, Slovak University of Technology, Radlinského
9, SK-81237 Bratislava, Slovak Republic
| | - Martin Breza
- Institute of Physical Chemistry and Chemical Physics, Faculty of
Chemical and Food Technology, Slovak University of Technology, Radlinského
9, SK-81237 Bratislava, Slovak Republic
| | - Peter Rapta
- Institute of Physical Chemistry and Chemical Physics, Faculty of
Chemical and Food Technology, Slovak University of Technology, Radlinského
9, SK-81237 Bratislava, Slovak Republic
| | - Joshua Telser
- Department of Biological, Chemical and
Physical Sciences, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605 United States
| | - J. Krzystek
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310 United States
| | - Vladimir B. Arion
- Faculty of Chemistry, Institute of Inorganic
Chemistry, University of Vienna, Währinger Strasse 42, A-1090 Vienna, Austria
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23
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Bakewell C, White AJP, Long NJ, Williams CK. Scandium and Yttrium Phosphasalen Complexes as Initiators for Ring-Opening Polymerization of Cyclic Esters. Inorg Chem 2015; 54:2204-12. [DOI: 10.1021/ic5027015] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Clare Bakewell
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Nicholas J. Long
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
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24
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Pirovano P, Farquhar ER, Swart M, Fitzpatrick AJ, Morgan GG, McDonald AR. Characterization and reactivity of a terminal nickel(III)-oxygen adduct. Chemistry 2015; 21:3785-90. [PMID: 25612563 DOI: 10.1002/chem.201406485] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Indexed: 11/06/2022]
Abstract
High-valent terminal metal-oxygen adducts are hypothesized to be the potent oxidizing reactants in late transition metal oxidation catalysis. In particular, examples of high-valent terminal nickel-oxygen adducts are scarce, meaning there is a dearth in the understanding of such oxidants. A monoanionic Ni(II)-bicarbonate complex has been found to react in a 1:1 ratio with the one-electron oxidant tris(4-bromophenyl)ammoniumyl hexachloroantimonate, yielding a thermally unstable intermediate in high yield (ca. 95%). Electronic absorption, electronic paramagnetic resonance, and X-ray absorption spectroscopies and density functional theory calculations confirm its description as a low-spin (S = 1/2), square planar Ni(III)-oxygen adduct. This rare example of a high-valent terminal nickel-oxygen complex performs oxidations of organic substrates, including 2,6-di-tert-butylphenol and triphenylphosphine, which are indicative of hydrogen atom abstraction and oxygen atom transfer reactivity, respectively.
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Affiliation(s)
- Paolo Pirovano
- School of Chemistry and CRANN/AMBER Nanoscience Institute, The University of Dublin, Trinity College, College Green, Dublin 2 (Ireland)
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25
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Kawai M, Yamaguchi T, Masaoka S, Tani F, Kohzuma T, Chiang L, Storr T, Mieda K, Ogura T, Szilagyi RK, Shimazaki Y. Influence of ligand flexibility on the electronic structure of oxidized Ni(III)-phenoxide complexes. Inorg Chem 2014; 53:10195-202. [PMID: 25254603 DOI: 10.1021/ic501181k] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
One-electron-oxidized Ni(III)-phenoxide complexes with salen-type ligands, [Ni(salen)py2](2+) ([1(en)-py](2+)) and [Ni(1,2-salcn)py2](2+) ([1(cn)-py](2+)), with a five-membered chelate dinitrogen backbone and [Ni(salpn)py2](2+) ([2(pn)-py](2+)), with a six-membered chelate backbone, have been characterized with a combination of experimental and theoretical methods. The five-membered chelate complexes [1(en)-py](2+) and [1(cn)-py](2+) were assigned as Ni(III)-phenoxyl radical species, while the six-membered chelate complex [2(pn)-py](2+) was concluded to be a Ni(II)-bis(phenoxyl radical) species with metal-centered reduction in the course of the one-electron oxidation of the Ni(III)-phenoxide complex [2(pn)-py](+). Thus, the oxidation state of the one-electron-oxidized Ni(III) salen-type complexes depends on the chelate ring size of the dinitrogen backbone.
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Affiliation(s)
- Minoru Kawai
- College of Science and ‡Graduate School of Science and Engineering, Ibaraki University , Bunkyo, Mito 310-8512, Japan
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