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Bernbeck M, Orlova AP, Hilgar JD, Gembicky M, Ozerov M, Rinehart JD. Dipolar Coupling as a Mechanism for Fine Control of Magnetic States in ErCOT-Alkyl Molecular Magnets. J Am Chem Soc 2024; 146:7243-7256. [PMID: 38456803 PMCID: PMC10958522 DOI: 10.1021/jacs.3c10412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 02/13/2024] [Accepted: 02/14/2024] [Indexed: 03/09/2024]
Abstract
The design of molecular magnets has progressed greatly by taking advantage of the ability to impart successive perturbations and control vibronic transitions in 4fn systems through the careful manipulation of the crystal field. Herein, we control the orientation and rigidity of two dinuclear ErCOT-based molecular magnets: the inversion-symmetric bridged [ErCOT(μ-Me)(THF)]2 (2) and the nearly linear Li[(ErCOT)2(μ-Me)3] (3). The conserved anisotropy of the ErCOT synthetic unit facilitates the direction of the arrangement of its magnetic anisotropy for the purposes of generating controlled internal magnetic fields, improving control of the energetics and transition probabilities of the electronic angular momentum states with exchange biasing via dipolar coupling. This control is evidenced through the introduction of a second thermal barrier to relaxation operant at low temperatures that is twice as large in 3 as in 2. This barrier acts to suppress through-barrier relaxation by protecting the ground state from interacting with stray local fields while operating at an energy scale an order of magnitude smaller than the crystal field term. These properties are highlighted when contrasted against the mononuclear structure ErCOT(Bn)(THF)2 (1), in which quantum tunneling of the magnetization processes dominate, as demonstrated by magnetometry and ab initio computational methods. Furthermore, far-infrared magnetospectroscopy measurements reveal that the increased rigidity imparted by successive removal of solvent ligands when adding bridging methyl groups, along with the increased excited state purity, severely limits local spin-vibrational interactions that facilitate magnetic relaxation, manifesting as longer relaxation times in 3 relative to those in 2 as temperature is increased.
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Affiliation(s)
- Maximilian
G. Bernbeck
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
| | - Angelica P. Orlova
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
| | - Jeremy D. Hilgar
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
| | - Milan Gembicky
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
| | - Mykhaylo Ozerov
- National
High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Jeffrey D. Rinehart
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
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2
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Navrátil M, Císařová I, Štěpnička P. Synthesis, Coordination and Electrochemistry of a Ferrocenyl‐Tagged Aminobisphosphane Ligand. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100558] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Michal Navrátil
- Department of Inorganic Chemistry Faculty of Science Charles University Hlavova 2030 128 40 Prague Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry Faculty of Science Charles University Hlavova 2030 128 40 Prague Czech Republic
| | - Petr Štěpnička
- Department of Inorganic Chemistry Faculty of Science Charles University Hlavova 2030 128 40 Prague Czech Republic
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3
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Jha VK, Das S, Subramaniyan V, Guchhait T, Dakua KK, Mishra S, Mani G. Synthesis, structural characterization, and bonding analysis of two-coordinate copper(I) and silver(I) complexes of pyrrole-based bis(phosphinimine): new metal-pyrrole ring π-interactions. Dalton Trans 2021; 50:8036-8044. [PMID: 34013307 DOI: 10.1039/d1dt01091c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The reaction between 2,5-bis(diphenylphosphinomethyl)pyrrole and Me3SiN3 gave the new pyrrole-based bis(phosphinimine) L1H in an excellent yield. L1H reacts with [CuCl(COD)]2, AgBF4, or AgOTf to give the corresponding two-coordinate mononuclear ionic complex formulated as [M{(L1H)-κ2N,N}]+[X]- where M = Cu and Ag; X = [CuCl2], BF4 or OTf. Their single crystal X-ray diffraction studies confirmed the two-coordinate geometry formed by the chelate bonding mode of L1H. These 10-membered metalacycles exhibit planar chirality and were also characterized by spectroscopic methods. In addition, in all three structures, there exists a hitherto unknown π-interaction between the pyrrole ring atoms and metal, represented as η2-(Cα-N) in the copper(i) complex, and η3-(Cα-N-Cα') in the silver(i) complexes. These weak interactions were supported by DFT calculations in terms of their electron densities, non-covalent interaction plots and the decrease in the aromaticity of the pyrrole ring.
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Affiliation(s)
- Vikesh Kumar Jha
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721 302, India.
| | - Sanghamitra Das
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721 302, India.
| | - Vasudevan Subramaniyan
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721 302, India.
| | - Tapas Guchhait
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721 302, India.
| | - Kishan Kumar Dakua
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721 302, India.
| | - Sabyashachi Mishra
- Department of Chemistry and Centre for Computational and Data Sciences, Indian Institute of Technology Kharagpur, Kharagpur-721 302, India.
| | - Ganesan Mani
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721 302, India.
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4
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Dickie TKK, MacNeil CS, Hayes PG. Consecutive N 2 loss from a uranium diphosphazide complex. Dalton Trans 2020; 49:578-582. [PMID: 31808763 DOI: 10.1039/c9dt04517a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new 'diphosphazidosalen' ligand was synthesized and successfully transferred to uranium using salt metathesis strategies. The resultant 8-coordinate uranium(iv) diphosphazide complex [κ6-1,2-{(N3)PPh2(2-O-C6H4)}2C6H4]UCl2 (1) is unstable to consecutive N2 loss, affording the asymmetric species [κ5-1-{(N3)PPh2(2-O-C6H4)}-2-{N=PPh2(2-O-C6H4)}C6H4)]UCl2 (2), defined by a phosphazide-phosphinimine mixed-ligand framework, and ultimately, the uranium(iv) phosphasalen complex [κ4-1,2-{N=PPh2(2-O-C6H4)}2C6H4]UCl2(THF) (3).
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Affiliation(s)
- Tara K K Dickie
- Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive, Lethbridge, AB T1K 3 M4, Canada.
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5
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Vasanthakumar A, Emslie DJ, Britten JF. Alkyl yttrium complexes of doubly cyclometallated xanthene- and naphthalene-backbone bis(phosphinimine) ligands. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.120980] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Lai A, Clifton J, Diaconescu PL, Fey N. Computational mapping of redox-switchable metal complexes based on ferrocene derivatives. Chem Commun (Camb) 2019; 55:7021-7024. [DOI: 10.1039/c9cc01977d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The properties of redox-switchable metal complexes have been captured with DFT-calculated parameters and processed into a map of chemical space, highlighting the effects of varying metals, donors, linkers and substituents in both accessible ferrocene oxidation states.
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Affiliation(s)
- Amy Lai
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
| | | | - Paula L. Diaconescu
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
| | - Natalie Fey
- School of Chemistry
- University of Bristol
- Bristol
- UK
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7
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Exploring Oxidation State-Dependent Selectivity in Polymerization of Cyclic Esters and Carbonates with Zinc(II) Complexes. iScience 2018; 7:120-131. [PMID: 30267674 PMCID: PMC6153418 DOI: 10.1016/j.isci.2018.08.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 06/21/2018] [Accepted: 08/21/2018] [Indexed: 11/24/2022] Open
Abstract
Neutral zinc alkoxide complexes show high activity toward the ring-opening polymerization of cyclic esters and carbonates, to generate biodegradable plastics applicable in several areas. Herein, we use a ferrocene-chelating heteroscorpionate complex in redox-switchable polymerization reactions, and we show that it is a moderately active catalyst for the ring-opening polymerization of L-lactide, ɛ-caprolactone, trimethylene carbonate, and δ-valerolactone. Uniquely for this type of catalyst, the oxidized complex has a similar polymerization activity as the corresponding reduced compound, but displays significantly different rates of reaction in the case of trimethylene carbonate and δ-valerolactone. Investigations of the oxidized compound suggest the presence of an organic radical rather than an Fe(III) complex. Electronic structure and density functional theory (DFT) calculations were performed to support the proposed electronic states of the catalytic complex and to help explain the observed reactivity differences. The catalyst was also compared with a monomeric phenoxide complex to show the influence of the phosphine-zinc interaction on catalytic properties. Dimeric and monomeric zinc heteroscorpionate species were prepared Monomeric zinc complex gives irreversible chemical redox and is inactive toward ROP Dimeric zinc complex gives reversible chemical redox and is inactive toward ROP Oxidation of the zinc benzoxide species occurs at the phosphine moiety
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8
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Hermans C, Rong W, Spaniol TP, Okuda J. Lanthanum complexes containing a bis(phenolate) ligand with a ferrocene-1,1'-diyldithio backbone: synthesis, characterization, and ring-opening polymerization of rac-lactide. Dalton Trans 2018; 45:8127-33. [PMID: 27088967 DOI: 10.1039/c6dt00272b] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lanthanum complexes [(L)LaX] (X = N(SiMe3)2, O(i)Pr , BH4) supported by a ferrocene-based (OSSO)-type ligand LH2 were synthesized and characterized by elemental analysis, NMR spectroscopy and cyclic voltammetry. The structure of was confirmed by single crystal X-ray diffraction. These complexes were highly active initiators for the ring-opening polymerization of rac-lactide (rac-LA). The activity depended on the initiating group in the order of ≈ > . The activities of and during polymerization were controlled in situ with external redox reagents by reversibly switching the oxidation state of the iron center.
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Affiliation(s)
- Catherine Hermans
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany.
| | - Weifeng Rong
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany.
| | - Thomas P Spaniol
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany.
| | - Jun Okuda
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany.
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9
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Brosmer JL, Huang W, Diaconescu PL. Reduction of Diphenylacetylene Mediated by Rare-Earth Ferrocene Diamide Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00541] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jonathan L. Brosmer
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Wenliang Huang
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, California 90095, United States
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10
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Wei J, Riffel MN, Diaconescu PL. Redox Control of Aluminum Ring-Opening Polymerization: A Combined Experimental and DFT Investigation. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02402] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Junnian Wei
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Madeline N. Riffel
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
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11
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Swanson DD, Conner KM, Brown SN. A chelating bis(aminophenol) ligand bridged by a 1,1′-ferrocene-bis(para-phenylene) linker. Dalton Trans 2017; 46:9049-9057. [DOI: 10.1039/c7dt01945a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The 1,1′-ferrocene-bis(p-phenylene) group serves as a structural linker connecting two iminosemiquinones to palladium without significant electronic interactions between the ferrocene and the palladium complex.
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Affiliation(s)
- Daniel D. Swanson
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
| | - Kyle M. Conner
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
| | - Seth N. Brown
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
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12
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Quan SM, Wang X, Zhang R, Diaconescu PL. Redox Switchable Copolymerization of Cyclic Esters and Epoxides by a Zirconium Complex. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00997] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Stephanie M. Quan
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E Young Drive East, Los Angeles, California 90095, United States
| | - Xinke Wang
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E Young Drive East, Los Angeles, California 90095, United States
| | - Rongjia Zhang
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E Young Drive East, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E Young Drive East, Los Angeles, California 90095, United States
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13
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Huang W, Diaconescu PL. Reactivity and Properties of Metal Complexes Enabled by Flexible and Redox-Active Ligands with a Ferrocene Backbone. Inorg Chem 2016; 55:10013-10023. [DOI: 10.1021/acs.inorgchem.6b01118] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Wenliang Huang
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E Young Drive East, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E Young Drive East, Los Angeles, California 90095, United States
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14
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Edelmann FT. Lanthanides and actinides: Annual survey of their organometallic chemistry covering the year 2015. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.04.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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15
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16
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Allouch F, Dwadnia N, Vologdin NV, Svyaschenko YV, Cattey H, Penouilh MJ, Roger J, Naoufal D, Ben Salem R, Pirio N, Hierso JC. Converging and Diverging Synthetic Strategies to Tetradentate (N,N′)-Diaminomethyl,(P,P′)-Ferrocenyl Ligands: Influence of tert-Butyl Groups on Ferrocene Backbone Conformation. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00601] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Fatima Allouch
- Institut
de Chimie
Moléculaire de l’Université de Bourgogne, ICMUB UMR 6302 CNRS, Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
| | - Nejib Dwadnia
- Institut
de Chimie
Moléculaire de l’Université de Bourgogne, ICMUB UMR 6302 CNRS, Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
| | - Nikolay V. Vologdin
- Institut
de Chimie
Moléculaire de l’Université de Bourgogne, ICMUB UMR 6302 CNRS, Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
| | - Yurii V. Svyaschenko
- Institut
de Chimie
Moléculaire de l’Université de Bourgogne, ICMUB UMR 6302 CNRS, Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
| | - Hélène Cattey
- Institut
de Chimie
Moléculaire de l’Université de Bourgogne, ICMUB UMR 6302 CNRS, Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
| | - Marie-José Penouilh
- Institut
de Chimie
Moléculaire de l’Université de Bourgogne, ICMUB UMR 6302 CNRS, Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
| | - Julien Roger
- Institut
de Chimie
Moléculaire de l’Université de Bourgogne, ICMUB UMR 6302 CNRS, Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
| | - Daoud Naoufal
- Laboratoire
de Chimie de Coordination Inorganique et Organométallique,
Faculté des Sciences, Université Libanaise, Beyrouth−Hadath, Lebanon
| | - Ridha Ben Salem
- Laboratoire
de Chimie Organique Physique UR11ES74, Faculté des Sciences, Université de Sfax, 3038 Sfax, Tunisia
| | - Nadine Pirio
- Institut
de Chimie
Moléculaire de l’Université de Bourgogne, ICMUB UMR 6302 CNRS, Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
| | - Jean-Cyrille Hierso
- Institut
de Chimie
Moléculaire de l’Université de Bourgogne, ICMUB UMR 6302 CNRS, Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
- Institut Universitaire de France (IUF), 103 Boulevard Saint-Michel, 75005 Paris, France
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17
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Wang X, Brosmer JL, Thevenon A, Diaconescu PL. Highly Active Yttrium Catalysts for the Ring-Opening Polymerization of ε-Caprolactone and δ-Valerolactone. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00442] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xinke Wang
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Jonathan L. Brosmer
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Arnaud Thevenon
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
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18
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Kenaree AR, Cuthbert TJ, Barbon SM, Boyle PD, Gillies ER, Ragogna PJ, Gilroy JB. Synthesis and Characterization of a Family of Air-Stable Ferrocene- and Ruthenocene-Containing Primary, Secondary, and Tertiary Phosphines. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00496] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
| | | | | | | | - Elizabeth R. Gillies
- Department
of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street N., London, Ontario, Canada N6A 5B9
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