1
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Tarifa L, Geer AM, Asensio L, López JA, Ciriano MA, Tejel C. Redox-Transmetalation Reactions: Easy Access to Homo- and Heterodimetallic d 8,d 10 Complexes. Inorg Chem 2023; 62:19421-19432. [PMID: 37988130 DOI: 10.1021/acs.inorgchem.3c02200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
The ability of the imine PyCH═N-CH2Py (Py = 2-pyridyl, bpi) to behave as a heteroditopic ligand, which is suitable for creating two separate compartments to host metals in different oxidation states, has been developed by studying the reactions of the mixed-valence complexes [(cod)M-Ι(μ-bpi)MΙ(cod)] (M = Rh, Ir) with [M'(Cl)2(PPh3)2] (M' = Pd, Ni). The results depend on the molar ratio of the reagents used (1:1 or 1:2) to give the heterometallic complexes {d10-M',d8-M}-[(PPh3)(Cl)M'0(μ-bpi)MΙ(cod)] (Pd,Rh, 4; Pd,Ir, 5; Ni,Rh, 8; Ni,Ir, 9) and the two-electron mixed-valent compounds [(PPh3)(Cl)M'0(μ-bpi)M'ΙΙ(Cl)] (M' = Ni, 10; Pd, 11), respectively. A redox process occurs in the replacement of the low-valent [(cod)M-I] fragment, whereas the exchange of the [(cod)MI] fragment is redox-neutral. The metal with a d8 configuration in the products exhibits a square-planar geometry coordinated to two (Rh/Ir) or three (Ni/Pd) nitrogen atoms of the bridging bpi ligand. Conversely, the metal with a d10 configuration adopts trigonal-planar geometries, π-bonded to the imine C═N bond. The isolated complexes 4/5 and 10/11, along with the hypothetical heterometallic Pd,Ni compound (12), were studied by DFT methods. Additionally, the T-shaped moiety 'M'ΙΙ(PPh3)(Cl)(η1-CH-N(bpi))', stabilized by a secondary γ-agostic interaction, and the 'M'II(Cl)(κ3N-bpi)' fragment was found to be accessible redoxomers of complexes 10 and 11 by DFT calculations.
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Affiliation(s)
- Luis Tarifa
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Ana M Geer
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Laura Asensio
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - José A López
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Miguel A Ciriano
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Cristina Tejel
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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2
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Tarifa L, Pilar Del Río M, Asensio L, López JA, Ciriano MA, Geer AM, Tejel C. Iridium-Catalyzed Regio- and Diastereoselective Synthesis of C-Substituted Piperazines. ACS Catal 2023; 13:3148-3152. [PMID: 36910865 PMCID: PMC9990149 DOI: 10.1021/acscatal.2c05895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 02/08/2023] [Indexed: 02/18/2023]
Abstract
Piperazine rings are essential motifs frequently found in commercial drugs. However, synthetic methodologies are mainly limited to N-substituted piperazines, preventing structural diversity. Disclosed herein is a straightforward catalytic method for the synthesis of complex C-substituted piperazines based on an uncommon head-to-head coupling of easily prepared imines. This 100% atom-economic process allows the selective formation of a sole diastereoisomer, a broad substrate scope, and a good functional group tolerance employing a bench-stable iridium catalyst under mild reaction conditions. Key to the success is the addition of N-oxides to the reaction mixture, as they notably enhance the catalytic activity and selectivity.
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Affiliation(s)
- Luis Tarifa
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - M Pilar Del Río
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Laura Asensio
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - José A López
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Miguel A Ciriano
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Ana M Geer
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Cristina Tejel
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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3
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Liu J, Bollmeyer MM, Kim Y, Xiao D, MacMillan SN, Chen Q, Leng X, Kim SH, Zhao L, Lancaster KM, Deng L. An Isolable Mononuclear Palladium(I) Amido Complex. J Am Chem Soc 2021; 143:10751-10759. [PMID: 34232039 DOI: 10.1021/jacs.1c04965] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mononuclear Pd(I) species are putative intermediates in Pd-catalyzed reactions, but our knowledge about them is limited due to difficulties in accessing them. Herein, we report the isolation of a Pd(I) amido complex, [(BINAP)Pd(NHArTrip)] (BINAP = 2,2'-bis(diphenylphosphino)-1,1'-binaphthalene, ArTrip = 2,6-bis(2',4',6'-triisopropylphenyl)phenyl), from the reaction of (BINAP)PdCl2 with LiNHArTrip. This Pd(I) amido species has been characterized by X-ray crystallography, electron paramagnetic resonance, and multiedge Pd X-ray absorption spectroscopy. Theoretical study revealed that, while the three-electron-two-center π-interaction between Pd and N in the Pd(I) complex imposes severe Pauli repulsion in its Pd-N bond, pronounced attractive interligand dispersion force aids its stabilization. In accord with its electronic features, reactions of homolytic Pd-N bond cleavage and deprotonation of primary amines are observed on the Pd(I) amido complex.
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Affiliation(s)
- Jian Liu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Melissa M Bollmeyer
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Yujeong Kim
- Western Seoul Center, Korea Basic Science Institute (KBSI), Seoul 03759, Republic of Korea.,Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Dengmengfei Xiao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Samantha N MacMillan
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Qi Chen
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Xuebing Leng
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Sun Hee Kim
- Western Seoul Center, Korea Basic Science Institute (KBSI), Seoul 03759, Republic of Korea.,Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Lili Zhao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Kyle M Lancaster
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Liang Deng
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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4
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Xue Q, Wu R, Wang D, Zhu M, Zuo W. The Stabilization Effect of π‐Backdonation Ligands on the Catalytic Reactivities of Amido‐Ene(amido) Iron Catalysts in the Asymmetric Transfer Hydrogenation of Ketones. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000470] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Qingquan Xue
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University 2999 North Renmin Road, Songjiang District 201620 Shanghai P. R. China
| | - Rongliang Wu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University 2999 North Renmin Road, Songjiang District 201620 Shanghai P. R. China
| | - Di Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University 2999 North Renmin Road, Songjiang District 201620 Shanghai P. R. China
| | - Meifang Zhu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University 2999 North Renmin Road, Songjiang District 201620 Shanghai P. R. China
| | - Weiwei Zuo
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University 2999 North Renmin Road, Songjiang District 201620 Shanghai P. R. China
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5
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Verhoeven DGA, Negenman HA, Orsino AF, Lutz M, Moret ME. Versatile Coordination and C-C Coupling of Diphosphine-Tethered Imine Ligands with Ni(II) and Ni(0). Inorg Chem 2018; 57:10846-10856. [PMID: 30113165 PMCID: PMC6150681 DOI: 10.1021/acs.inorgchem.8b01478] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
![]()
Ligands
that can adapt their coordination mode to the electronic properties
of a metal center are of interest to support catalysis or small molecule
activation processes. In this context, the ability of imine moieties
to bind in either an η1(N)-fashion via σ-donation
of the lone pair or, less commonly, in an η2(C,N)-fashion
via π-coordination is potentially attractive for the design
of new metal–ligand cooperative systems. Herein, the coordination
chemistry of chelating ligands with a diphosphine imine framework
(PCNP) to nickel is investigated. The imine moiety binds in an η1(N)-fashion in a Ni(II)Cl2 complex. The uncommon
η2(C,N)-interaction is obtained in Ni(0) complexes
in the presence of a PPh3 coligand. Increasing the bulk
on the phosphine side-arms in the Ni(0) complexes, by substituting
phenyl for o-tolyl groups, leads to a distinct binding
mode in which only one of the phosphorus atoms is coordinated. In
the absence of a coligand, a mixture of two different dimeric Ni(0)
complexes is formed. In one of them, the imine adopts an uncommon
η1(N)η2(C,N) bridging mode of the
ligand to nickel, while the second one may involve reactivity on the
ligand by the formation of a new C–C bond by oxidative coupling.
The latter is supported by the isolation and structural characterization
of a crystalline bis-CO derivative featuring a C–C bond formed
by oxidative coupling of two imine moieties. The coordination chemistry
of a series of diphosphine-imine ligands (PCNP) to Ni is investigated,
with the purpose of developing systems that present metal−ligand
cooperativity. The ligands bind in versatile ways, adapting to the
oxidation state and coordination environment of the metal center.
Additionally, a dimeric derivative undergoes oxidative C−C
coupling in the presence of CO, resulting in an unusual mixed valence
Ni(II)/Ni(0) dinuclear complex.
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Affiliation(s)
- Dide G A Verhoeven
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science , Utrecht University , Universiteitsweg 99 , 3584 CG , Utrecht , The Netherlands
| | - Hidde A Negenman
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science , Utrecht University , Universiteitsweg 99 , 3584 CG , Utrecht , The Netherlands
| | - Alessio F Orsino
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science , Utrecht University , Universiteitsweg 99 , 3584 CG , Utrecht , The Netherlands
| | - Martin Lutz
- Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Faculty of Science , Utrecht University , Padualaan 8 , 3584 CH , Utrecht , The Netherlands
| | - Marc-Etienne Moret
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science , Utrecht University , Universiteitsweg 99 , 3584 CG , Utrecht , The Netherlands
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6
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Prince BM, Cundari TR. Computational Study of Methane C–H Activation by Earth-Abundant Metal Amide/Aminyl Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00600] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bruce M. Prince
- Center
for Catalysis Computational Research (3CR), Department of Chemistry, Texas Southern University, 3100 Cleburne Street, Houston, Texas 77004, United States
| | - Thomas R. Cundari
- Department
of Chemistry, CASCaM, University of North Texas, 1155 Union Circle,
#305070, Denton, Texas 76203-5017, United States
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7
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Wakizaka M, Matsumoto T, Kobayashi A, Kato M, Chang HC. A Coordination Network with Ligand-Centered Redox Activity Based on facial-[Cr III (2-mercaptophenolato) 3 ] 3- Metalloligands. Chemistry 2017; 23:9919-9925. [PMID: 28556286 DOI: 10.1002/chem.201701613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Indexed: 11/11/2022]
Abstract
The design of redox-active metal-organic frameworks and coordination networks (CNs), which exhibit metal- and/or ligand-centered redox activity, has recently received increased attention. In this study, the redox-active metalloligand (RML) [Me4 N]3 fac-[CrIII (mp)3 ] (1) (mp=2-mercaptophenolato) was synthesized and characterized by single-crystal X-ray diffraction analysis, and its reversible ligand-centered one-electron oxidation was examined by cyclic voltammetry and spectroelectrochemical measurements. Since complex 1 contains O/S coordination sites in three directions, complexation with K+ ions led to the formation of the two-dimensional honeycomb sheet-structured [K3 fac-{CrIII (mp)3 }(H2 O)6 ]n (2⋅6 H2 O), which is the first example of a redox-active CN constructed from a RML with o-disubstituted benzene ligands. Herein, we unambiguously demonstrate the ligand-centered redox activity of the RML within the CN 2⋅6 H2 O in the solid state.
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Affiliation(s)
- Masanori Wakizaka
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan.,Department of Chemistry, Faculty of Science, Hokkaido University, North-10, West-8, Kita-ku, Sapporo, 060-0810, Japan
| | - Takeshi Matsumoto
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Atsushi Kobayashi
- Department of Chemistry, Faculty of Science, Hokkaido University, North-10, West-8, Kita-ku, Sapporo, 060-0810, Japan
| | - Masako Kato
- Department of Chemistry, Faculty of Science, Hokkaido University, North-10, West-8, Kita-ku, Sapporo, 060-0810, Japan
| | - Ho-Chol Chang
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
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8
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Jacquet J, Desage-El Murr M, Fensterbank L. Metal-Promoted Coupling Reactions Implying Ligand-Based Redox Changes. ChemCatChem 2016. [DOI: 10.1002/cctc.201600616] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jérémy Jacquet
- Sorbonne Universités, UPMC, Université Paris 06,UMR CNRS 8232, Institut Parisien de Chimie Moléculaire; France
| | - Marine Desage-El Murr
- Sorbonne Universités, UPMC, Université Paris 06,UMR CNRS 8232, Institut Parisien de Chimie Moléculaire; France
| | - Louis Fensterbank
- Sorbonne Universités, UPMC, Université Paris 06,UMR CNRS 8232, Institut Parisien de Chimie Moléculaire; France
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9
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Phelps J, Butikofer JL, Thapaliya B, Gale E, Vowell CL, Debnath S, Arulsamy N, Roddick DM. Structural and reactivity properties of perfluoroalkylphosphine complexes of platinum(0). Polyhedron 2016. [DOI: 10.1016/j.poly.2016.04.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Sikari R, Sinha S, Jash U, Das S, Brandão P, de Bruin B, Paul ND. Deprotonation Induced Ligand Oxidation in a NiII Complex of a Redox Noninnocent N1-(2-Aminophenyl)benzene-1,2-diamine and Its Use in Catalytic Alcohol Oxidation. Inorg Chem 2016; 55:6114-23. [DOI: 10.1021/acs.inorgchem.6b00646] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Rina Sikari
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Suman Sinha
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Upasona Jash
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Siuli Das
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Paula Brandão
- Departamento de Química,
CICECO-Instituto de Materiais de Aveiro,Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - Bas de Bruin
- Homogeneous Catalysis Group, van ’t Hoff Institute for Molecular
Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Nanda D. Paul
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
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Tang Z, Tejel C, Martinez de Sarasa Buchaca M, Lutz M, van der Vlugt JI, de Bruin B. Reactivity of Me-pma RhIand IrIComplexes upon Deprotonation and Their Application in Catalytic Carbene Carbonylation Reactions. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501302] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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12
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Abstract
Recent advances in the use of tethered π-coordinating ligands for metal–ligand cooperation.
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Affiliation(s)
- Dide G. A. Verhoeven
- Organic Chemistry & Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Universiteitsweg 99
- 3584 CG Utrecht
| | - Marc-Etienne Moret
- Organic Chemistry & Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Universiteitsweg 99
- 3584 CG Utrecht
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13
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Tang Z, Otten E, Reek JNH, van der Vlugt JI, de Bruin B. Dynamic Ligand Reactivity in a Rhodium Pincer Complex. Chemistry 2015. [DOI: 10.1002/chem.201501453] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Goswami M, Lyaskovskyy V, Domingos SR, Buma WJ, Woutersen S, Troeppner O, Ivanović-Burmazović I, Lu H, Cui X, Zhang XP, Reijerse EJ, DeBeer S, van Schooneveld MM, Pfaff FF, Ray K, de Bruin B. Characterization of Porphyrin-Co(III)-'Nitrene Radical' Species Relevant in Catalytic Nitrene Transfer Reactions. J Am Chem Soc 2015; 137:5468-79. [PMID: 25844713 PMCID: PMC4750382 DOI: 10.1021/jacs.5b01197] [Citation(s) in RCA: 167] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
To fully characterize the Co(III)-'nitrene radical' species that are proposed as intermediates in nitrene transfer reactions mediated by cobalt(II) porphyrins, different combinations of cobalt(II) complexes of porphyrins and nitrene transfer reagents were combined, and the generated species were studied using EPR, UV-vis, IR, VCD, UHR-ESI-MS, and XANES/XAFS measurements. Reactions of cobalt(II) porphyrins 1(P1) (P1 = meso-tetraphenylporphyrin (TPP)) and 1(P2) (P2 = 3,5-Di(t)Bu-ChenPhyrin) with organic azides 2(Ns) (NsN3), 2(Ts) (TsN3), and 2(Troc) (TrocN3) led to the formation of mono-nitrene species 3(P1)(Ns), 3(P2)(Ts), and 3(P2)(Troc), respectively, which are best described as [Co(III)(por)(NR″(•-))] nitrene radicals (imidyl radicals) resulting from single electron transfer from the cobalt(II) porphyrin to the 'nitrene' moiety (Ns: R″ = -SO2-p-C6H5NO2; Ts: R″ = -SO2C6H6; Troc: R″ = -C(O)OCH2CCl3). Remarkably, the reaction of 1(P1) with N-nosyl iminoiodane (PhI═NNs) 4(Ns) led to the formation of a bis-nitrene species 5(P1)(Ns). This species is best described as a triple-radical complex [(por(•-))Co(III)(NR″(•-))2] containing three ligand-centered unpaired electrons: two nitrene radicals (NR″(•-)) and one oxidized porphyrin radical (por(•-)). Thus, the formation of the second nitrene radical involves another intramolecular one-electron transfer to the "nitrene" moiety, but now from the porphyrin ring instead of the metal center. Interestingly, this bis-nitrene species is observed only on reacting 4(Ns) with 1(P1). Reaction of the more bulky 1(P2) with 4(Ns) results again in formation of mainly mono-nitrene species 3(P2)(Ns) according to EPR and ESI-MS spectroscopic studies. The mono- and bis-nitrene species were initially expected to be five- and six-coordinate species, respectively, but XANES data revealed that both mono- and bis-nitrene species are six-coordinate O(h) species. The nature of the sixth ligand bound to cobalt(III) in the mono-nitrene case remains elusive, but some plausible candidates are NH3, NH2(-), NsNH(-), and OH(-); NsNH(-) being the most plausible. Conversion of mono-nitrene species 3(P1)(Ns) into bis-nitrene species 5(P1)(Ns) upon reaction with 4(Ns) was demonstrated. Solutions containing 3(P1)(Ns) and 5(P1)(Ns) proved to be still active in catalytic aziridination of styrene, consistent with their proposed key involvement in nitrene transfer reactions mediated by cobalt(II) porphyrins.
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Affiliation(s)
- Monalisa Goswami
- Van ’t Hoff Institute for Molecular Sciences (HIMS), Homogeneous and Supramolecular Catalysis, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Volodymyr Lyaskovskyy
- Van ’t Hoff Institute for Molecular Sciences (HIMS), Homogeneous and Supramolecular Catalysis, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Sérgio R. Domingos
- HIMS, Photonics group, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Wybren Jan Buma
- HIMS, Photonics group, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Sander Woutersen
- HIMS, Photonics group, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Oliver Troeppner
- Lehrstuhl für Bioanorganische Chemie, Department Chemie und Pharmazie, Universität Erlangen-Nürnberg. Egerlandstraße 1, D-91058 Erlangen, Germany
| | - Ivana Ivanović-Burmazović
- Lehrstuhl für Bioanorganische Chemie, Department Chemie und Pharmazie, Universität Erlangen-Nürnberg. Egerlandstraße 1, D-91058 Erlangen, Germany
| | - Hongjian Lu
- Department of Chemistry, University of South Florida, Tampa, Florida 33620-5250, United States
| | - Xin Cui
- Department of Chemistry, University of South Florida, Tampa, Florida 33620-5250, United States
| | - X. Peter Zhang
- Department of Chemistry, University of South Florida, Tampa, Florida 33620-5250, United States
| | - Edward J. Reijerse
- Max Planck Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max Planck Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Matti M. van Schooneveld
- Max Planck Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Florian Felix Pfaff
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
| | - Kallol Ray
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
| | - Bas de Bruin
- Van ’t Hoff Institute for Molecular Sciences (HIMS), Homogeneous and Supramolecular Catalysis, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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15
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Jongbloed LS, de Bruin B, Reek JNH, Lutz M, van der Vlugt JI. Facile Synthesis and Versatile Reactivity of an Unusual Cyclometalated Rhodium(I) Pincer Complex. Chemistry 2015; 21:7297-305. [DOI: 10.1002/chem.201406463] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 01/23/2015] [Indexed: 12/27/2022]
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16
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Berben LA. Catalysis by Aluminum(III) Complexes of Non-Innocent Ligands. Chemistry 2014; 21:2734-42. [DOI: 10.1002/chem.201405400] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Indexed: 12/20/2022]
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17
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Deibel N, Hohloch S, Schweinfurth D, Weisser F, Grupp A, Sarkar B. Three-way cooperativity in d8 metal complexes with ligands displaying chemical and redox non-innocence. Chemistry 2014; 20:15178-87. [PMID: 25251147 DOI: 10.1002/chem.201403276] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Indexed: 01/19/2023]
Abstract
Reversible proton- and electron-transfer steps are crucial for various chemical transformations. The electron-reservoir behavior of redox non-innocent ligands and the proton-reservoir behavior of chemically non-innocent ligands can be cooperatively utilized for substrate bond activation. Although site-decoupled proton- and electron-transfer steps are often found in enzymatic systems, generating model metal complexes with these properties remains challenging. To tackle this issue, we present herein complexes [(cod-H)M(μ-L(2-)) M(cod-H)] (M = Pt(II), [1] or Pd(II), [2], cod = 1,5-cyclooctadiene, H2L = 2,5-di-[2,6-(diisopropyl)anilino]-1,4-benzoquinone), in which cod acts as a proton reservoir, and L(2-) as an electron reservoir. Protonation of [2] leads to an unusual tetranuclear complex. However, [1] can be stepwise reversibly protonated with up to two protons on the cod-H ligands, and the protonated forms can be stepwise reversibly reduced with up to two electrons on the L(2-) ligand. The doubly protonated form of [1] is also shown to react with OMe(-) leading to an activation of the cod ligands. The site-decoupled proton and electron reservoir sources work in tandem in a three-way cooperative process that results in the transfer of two electrons and two protons to a substrate leading to its double reduction and protonation. These results will possibly provide new insights into developing catalysts for multiple proton- and electron-transfer reactions by using metal complexes of non-innocent ligands.
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Affiliation(s)
- Naina Deibel
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart (Germany)
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18
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Molon M, Gemel C, Fischer RA. Organogallium- and organozinc-rich palladium and platinum clusters. Dalton Trans 2014; 43:3114-20. [PMID: 24292372 DOI: 10.1039/c3dt53003e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Mariusz Molon
- Anorganische Chemie II, Organometallics and Materials Chemistry, Ruhr-Universität Bochum, Universitätsstraße 150, 44780, Bochum, Germany.
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19
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Szklarzewicz J, Stadnicka K. Endiol ligand formation from 2-pyridinecarboxaldehyde on a Mo(IV) centre. The X-ray crystal structure and properties of the Mo(IV) binuclear complex. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2012.06.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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