1
|
Ghosh P, de Vos S, Lutz M, Gloaguen F, Schollhammer P, Moret ME, Klein Gebbink RJM. Electrocatalytic Proton Reduction by a Cobalt Complex Containing a Proton-Responsive Bis(alkylimdazole)methane Ligand: Involvement of a C-H Bond in H 2 Formation. Chemistry 2020; 26:12560-12569. [PMID: 32350932 PMCID: PMC7589288 DOI: 10.1002/chem.201905746] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 04/19/2020] [Indexed: 01/13/2023]
Abstract
Homogeneous electrocatalytic proton reduction is reported using cobalt complex [1](BF4)2. This complex comprises two bis(1‐methyl‐4,5‐diphenyl‐1H‐imidazol‐2‐yl)methane (HBMIMPh2
) ligands that contain an acidic methylene moiety in their backbone. Upon reduction of [1](BF4)2 by either electrochemical or chemical means, one of its HBMIMPh2
ligands undergoes deprotonation under the formation of dihydrogen. Addition of a mild proton source (acetic acid) to deprotonated complex [2](BF4) regenerates protonated complex [1](BF4)2. In presence of acetic acid in acetonitrile solvent [1](BF4)2 shows electrocatalytic proton reduction with a kobs of ≈200 s−1 at an overpotential of 590 mV. Mechanistic investigations supported by DFT (BP86) suggest that dihydrogen formation takes place in an intramolecular fashion through the participation of a methylene C−H bond of the HBMIMPh2
ligand and a CoII−H bond through formal heterolytic splitting of the latter. These findings are of interest to the development of responsive ligands for molecular (base)metal (electro)catalysis.
Collapse
Affiliation(s)
- Pradip Ghosh
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands.,Present address: Department of Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany
| | - Sander de Vos
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
| | - Martin Lutz
- Crystal and Structural Chemistry, Bijvoet Centre for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands
| | - Frederic Gloaguen
- UMR 6521, CNRS, Université de Bretagne Occidentale, CS 93837, 29238, Brest, France
| | | | - Marc-Etienne Moret
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
| | - Robertus J M Klein Gebbink
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
| |
Collapse
|
2
|
Sondermann C, Pižl M, Paretzki A, Feil C, Ringenberg MR, Záliš S, Kaim W. Analysis of a Diimine‐Organonickel Redox Series. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000455] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Christina Sondermann
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Martin Pižl
- J. Heyrovský Institute of Physical Chemistry The Czech Academy of Sciences Dolejškova 3 18223 Prague Czech Republic
- University of Chemistry and Technology Technická 5 166 28 Prague 6 Czech Republic
| | - Alexa Paretzki
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Christoph Feil
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Mark R. Ringenberg
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Stanislav Záliš
- J. Heyrovský Institute of Physical Chemistry The Czech Academy of Sciences Dolejškova 3 18223 Prague Czech Republic
| | - Wolfgang Kaim
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| |
Collapse
|
3
|
Hitzfeld PS, Kretschmer R. Cooperative H–X Bond Activation by Electron‐Precise Aluminium and Gallium Compounds Incorporating β‐Diketiminate Ligands. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.201901320] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Patrick S. Hitzfeld
- Institute of Organic Chemistry University of Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Robert Kretschmer
- Juniorprofessorship (Tenure Track) Inorganic Chemistry of Catalysis Institute of Inorganic and Analytical Chemistry (IAAC) Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
- Jena Center for Soft Matter (JCSM) Friedrich Schiller University Jena Philosophenweg 7 07743 Jena Germany
| |
Collapse
|
4
|
Vinum MG, Voigt L, Bell C, Mihrin D, Larsen RW, Clark KM, Pedersen KS. Evidence for Non-Innocence of a β-Diketonate Ligand. Chemistry 2020; 26:2143-2147. [PMID: 31721307 DOI: 10.1002/chem.201904899] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Indexed: 11/07/2022]
Abstract
β-Diketonates, such as acetylacetonate, are amongst the most common bidentate ligands towards elements across the entire periodic table and are considered wholly redox-inactive in their complexes. Herein we show that complexation of 1,1,1,5,5,5-hexafluoroacetylacetonate (hfac- ) to CrII spontaneously affords CrIII and a reduced β-diketonate radical ligand scaffold, as evidenced by crystallographic analysis, magnetic measurements, optical spectroscopy, reactivity studies, and DFT calculations. The possibility of harnessing β-diketonates as electron reservoirs opens up possibilities for new metal-ligand concerted reactivity in the ubiquitous β-diketonate coordination chemistry.
Collapse
Affiliation(s)
- Morten Gotthold Vinum
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
| | - Laura Voigt
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
| | - Colby Bell
- Department of Chemistry, The University of Memphis, Memphis, TN, USA
| | - Dmytro Mihrin
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
| | - René Wugt Larsen
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
| | | | - Kasper S Pedersen
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
| |
Collapse
|
5
|
Kumar Bera S, Panda S, Baksi SD, Kumar Lahiri G. Redox Non‐Innocence and Isomer‐Specific Oxidative Functionalization of Ruthenium‐Coordinated β‐Ketoiminate. Chem Asian J 2019; 14:4236-4245. [DOI: 10.1002/asia.201901093] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 09/13/2019] [Indexed: 11/06/2022]
Affiliation(s)
- Sudip Kumar Bera
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Sanjib Panda
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Sourajit Dey Baksi
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Goutam Kumar Lahiri
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai 400076 India
| |
Collapse
|
6
|
van der Vlugt JI. Radical-Type Reactivity and Catalysis by Single-Electron Transfer to or from Redox-Active Ligands. Chemistry 2019; 25:2651-2662. [PMID: 30084211 PMCID: PMC6471147 DOI: 10.1002/chem.201802606] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Indexed: 12/12/2022]
Abstract
Controlled ligand-based redox-activity and chemical non-innocence are rapidly gaining importance for selective (catalytic) processes. This Concept aims to provide an overview of the progress regarding ligand-to-substrate single-electron transfer as a relatively new mode of operation to exploit ligand-centered reactivity and catalysis based thereon.
Collapse
Affiliation(s)
- Jarl Ivar van der Vlugt
- Bio-Inspired Homogeneous and Supramolecular Catalysis Groupvan ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamNetherlands
| |
Collapse
|
7
|
Hohloch S, Garner ME, Booth CH, Lukens WW, Gould CA, Lussier DJ, Maron L, Arnold J. Isolation of a TMTAA-Based Radical in Uranium bis-TMTAA Complexes. Angew Chem Int Ed Engl 2018; 57:16136-16140. [PMID: 30328669 DOI: 10.1002/anie.201810971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Indexed: 01/02/2023]
Abstract
We report the synthesis, characterization, and electronic structure studies of a series of thorium(IV) and uranium(IV) bis-tetramethyltetraazaannulene complexes. These sandwich complexes show remarkable stability towards air and moisture, even at elevated temperatures. Electrochemical studies show the uranium complex to be stable in three different oxidation states; isolation of the oxidized species reveals a rare case of a non-innocent tetramethyltetraazaannulene (TMTAA) ligand.
Collapse
Affiliation(s)
- Stephan Hohloch
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA.,University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany
| | - Mary E Garner
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Corwin H Booth
- Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Wayne W Lukens
- Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Colin A Gould
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Daniel J Lussier
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA.,Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Laurent Maron
- LPCNO, Université de Toulouse, INSA Toulouse, 135 Avenue de Rangueil, 31077, Toulouse, France
| | - John Arnold
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA.,Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| |
Collapse
|
8
|
Hohloch S, Garner ME, Booth CH, Lukens WW, Gould CA, Lussier DJ, Maron L, Arnold J. Isolation of a TMTAA‐Based Radical in Uranium bis‐TMTAA Complexes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201810971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Stephan Hohloch
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
- University of Paderborn Warburger Straße 100 33098 Paderborn Germany
| | - Mary E. Garner
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Corwin H. Booth
- Chemical Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Wayne W. Lukens
- Chemical Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Colin A. Gould
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Daniel J. Lussier
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
- Chemical Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Laurent Maron
- LPCNO Université de Toulouse, INSA Toulouse 135 Avenue de Rangueil 31077 Toulouse France
| | - John Arnold
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
- Chemical Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| |
Collapse
|
9
|
Broere DLJ, Mercado BQ, Lukens JT, Vilbert AC, Banerjee G, Lant HMC, Lee SH, Bill E, Sproules S, Lancaster KM, Holland PL. Reversible Ligand-Centered Reduction in Low-Coordinate Iron Formazanate Complexes. Chemistry 2018; 24:9417-9425. [PMID: 29663542 PMCID: PMC6115202 DOI: 10.1002/chem.201801298] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Indexed: 02/01/2023]
Abstract
Coordination of redox-active ligands to metals is a compelling strategy for making reduced complexes more accessible. In this work, we explore the use of redox-active formazanate ligands in low-coordinate iron chemistry. Reduction of an iron(II) precursor occurs at milder potentials than analogous non-redox-active β-diketiminate complexes, and the reduced three-coordinate formazanate-iron compound is characterized in detail. Structural, spectroscopic, and computational analysis show that the formazanate ligand undergoes reversible ligand-centered reduction to form a formazanate radical dianion in the reduced species. The less negative reduction potential of the reduced low-coordinate iron formazanate complex leads to distinctive reactivity with formation of a new N-I bond that is not seen with the β-diketiminate analogue. Thus, the storage of an electron on the supporting ligand changes the redox potential and enhances certain reactivity.
Collapse
Affiliation(s)
- Daniel L. J. Broere
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States, /
| | - Brandon Q. Mercado
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States, /
| | - James T. Lukens
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca New York 14853
| | - Avery C. Vilbert
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca New York 14853
| | - Gourab Banerjee
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States, /
| | - Hannah M. C. Lant
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States, /
| | - Shin Hee Lee
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States, /
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Stephen Sproules
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Kyle M. Lancaster
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca New York 14853
| | - Patrick L. Holland
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States, /
| |
Collapse
|
10
|
Ghosh P, Naastepad R, Riemersma CF, Lutz M, Moret ME, Klein Gebbink RJM. Noninnocent β-Diiminate Ligands: Redox Activity of a Bis(alkylimidazole)methane Ligand in Cobalt and Zinc Complexes. Chemistry 2017; 23:10732-10737. [DOI: 10.1002/chem.201701215] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Pradip Ghosh
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science; Utrecht University; The Netherlands
| | - Richard Naastepad
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science; Utrecht University; The Netherlands
| | - Charl F. Riemersma
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science; Utrecht University; The Netherlands
| | - Martin Lutz
- Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research; Utrecht University; The Netherlands
| | - Marc-Etienne Moret
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science; Utrecht University; The Netherlands
| | | |
Collapse
|
11
|
Kretschmer R, Dehmel M, Bodensteiner M. Versatile BulkyN,N′,N′-Substituted 1,2-Ethanediamine Ligands and Their Lithium, Aluminium, and Gallium Derivatives. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601355] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Robert Kretschmer
- Institut für Anorganische Chemie; Universität Regensburg; Universitätsstraße 31 93053 Regensburg Germany
| | - Maximilian Dehmel
- Institut für Anorganische Chemie; Universität Regensburg; Universitätsstraße 31 93053 Regensburg Germany
| | - Michael Bodensteiner
- Zentrale Analytik, Röntgenstrukturanalyse; Universität Regensburg; Universitätsstrasse 31 93053 Regensburg Germany
| |
Collapse
|
12
|
Klementyeva SV, Gritsan NP, Khusniyarov MM, Witt A, Dmitriev AA, Suturina EA, Hill NDD, Roemmele TL, Gamer MT, Boeré RT, Roesky PW, Zibarev AV, Konchenko SN. The First Lanthanide Complexes with a Redox-Active Sulfur Diimide Ligand: Synthesis and Characterization of [LnCp*2(RN=)2S], Ln=Sm, Eu, Yb; R=SiMe3. Chemistry 2016; 23:1278-1290. [DOI: 10.1002/chem.201604340] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 10/26/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Svetlana V. Klementyeva
- Nikolaev Institute of Inorganic Chemistry; Siberian Branch Russian Academy of Sciences; 630090 Novosibirsk Russia
- Institute for Inorganic Chemistry; Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
- Razuvaev Institute of Organometallic Chemistry; Russian Academy of Sciences; 603137 Nizhny Novgorod Russia
| | - Nina P. Gritsan
- Department of Physics; Novosibirsk State University; 630090 Novosibirsk Russia
- Voevodsky Institute of Chemical Kinetics and Combustion; Siberian Branch Russian Academy of Sciences; 630090 Novosibirsk Russia
| | - Marat M. Khusniyarov
- Department of Chemistry and Pharmacy; Friedrich-Alexander-University Erlangen-Nürnberg (FAU); 91058 Erlangen Germany
| | - Alexander Witt
- Department of Chemistry and Pharmacy; Friedrich-Alexander-University Erlangen-Nürnberg (FAU); 91058 Erlangen Germany
| | - Alexey A. Dmitriev
- Department of Physics; Novosibirsk State University; 630090 Novosibirsk Russia
- Voevodsky Institute of Chemical Kinetics and Combustion; Siberian Branch Russian Academy of Sciences; 630090 Novosibirsk Russia
| | - Elizaveta A. Suturina
- Voevodsky Institute of Chemical Kinetics and Combustion; Siberian Branch Russian Academy of Sciences; 630090 Novosibirsk Russia
- Max Planck Institute for Chemical Energy Conversion; 45470 Mülheim an der Ruhr Germany
| | - Nathan D. D. Hill
- Department of Chemistry and Biochemistry; University of Lethbridge; Lethbridge Alberta T1K3M4 Canada
| | - Tracey L. Roemmele
- Department of Chemistry and Biochemistry; University of Lethbridge; Lethbridge Alberta T1K3M4 Canada
| | - Michael T. Gamer
- Institute for Inorganic Chemistry; Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
| | - René T. Boeré
- Department of Chemistry and Biochemistry; University of Lethbridge; Lethbridge Alberta T1K3M4 Canada
| | - Peter W. Roesky
- Institute for Inorganic Chemistry; Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
| | - Andrey V. Zibarev
- Department of Physics; Novosibirsk State University; 630090 Novosibirsk Russia
- Vorozhtsov Institute of Organic Chemistry; Siberian Branch Russian Academy of Sciences; 630090 Novosibirsk Russia
| | - Sergey N. Konchenko
- Nikolaev Institute of Inorganic Chemistry; Siberian Branch Russian Academy of Sciences; 630090 Novosibirsk Russia
- Institute for Inorganic Chemistry; Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
- Department of Natural Sciences; Novosibirsk State University; 630090 Novosibirsk Russia
| |
Collapse
|
13
|
Kaim W. Electron Transfer Reactivity of Organometallic Compounds Involving Radical-Forming Noninnocent Ligands. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES 2016. [DOI: 10.1007/s40010-016-0304-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
14
|
Khusniyarov MM. How to Switch Spin-Crossover Metal Complexes at Constant Room Temperature. Chemistry 2016; 22:15178-15191. [DOI: 10.1002/chem.201601140] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Marat M. Khusniyarov
- Department of Chemistry and Pharmacy; Friedrich-Alexander University Erlangen-Nürnberg (FAU); Egerlandstr. 1 91058 Erlangen Germany
| |
Collapse
|
15
|
Mondal P, Chatterjee M, Paretzki A, Beyer K, Kaim W, Lahiri GK. Noninnocence of Indigo: Dehydroindigo Anions as Bridging Electron-Donor Ligands in Diruthenium Complexes. Inorg Chem 2016; 55:3105-16. [DOI: 10.1021/acs.inorgchem.6b00038] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Prasenjit Mondal
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Madhumita Chatterjee
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Alexa Paretzki
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Katharina Beyer
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Wolfgang Kaim
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Goutam Kumar Lahiri
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| |
Collapse
|
16
|
Mandal A, Schwederski B, Fiedler J, Kaim W, Lahiri GK. Evidence for Bidirectional Noninnocent Behavior of a Formazanate Ligand in Ruthenium Complexes. Inorg Chem 2015; 54:8126-35. [DOI: 10.1021/acs.inorgchem.5b01408] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Abhishek Mandal
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Brigitte Schwederski
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Jan Fiedler
- J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova
3, CZ-18223 Prague, Czech Republic
| | - Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Goutam Kumar Lahiri
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| |
Collapse
|
17
|
Kaim W. Complete and Partial Electron Transfer Involving Coordinated NOx. ADVANCES IN INORGANIC CHEMISTRY 2015. [DOI: 10.1016/bs.adioch.2014.10.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
18
|
Ehret F, Bubrin M, Záliš S, Kaim W. Non-innocent Redox Behavior of Amidinato Ligands: Spectroscopic Evidence for Amidinyl Complexes. Z Anorg Allg Chem 2014. [DOI: 10.1002/zaac.201400306] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
19
|
Witt A, Heinemann FW, Sproules S, Khusniyarov MM. Modulation of Magnetic Properties at Room Temperature: Coordination-Induced Valence Tautomerism in a Cobalt Dioxolene Complex. Chemistry 2014; 20:11149-62. [DOI: 10.1002/chem.201402129] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Indexed: 11/06/2022]
|
20
|
Chang MC, Dann T, Day DP, Lutz M, Wildgoose GG, Otten E. The Formazanate Ligand as an Electron Reservoir: Bis(Formazanate) Zinc Complexes Isolated in Three Redox States. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309948] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
21
|
Chang MC, Dann T, Day DP, Lutz M, Wildgoose GG, Otten E. The Formazanate Ligand as an Electron Reservoir: Bis(Formazanate) Zinc Complexes Isolated in Three Redox States. Angew Chem Int Ed Engl 2014; 53:4118-22. [DOI: 10.1002/anie.201309948] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 01/22/2014] [Indexed: 11/06/2022]
|
22
|
Ehret F, Bubrin M, Záliš S, Kaim W. Eine weitere Unschuldsvermutung widerlegt: Triazenido- versus Triazenylradikal-Ligandenfunktion sowie eine Anmerkung zu [NO2]nals “suspektem” Liganden. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209260] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
23
|
Ehret F, Bubrin M, Záliš S, Kaim W. Discovering more non-innocence: triazenido versus triazenyl radical ligand function, and a comment on [NO2]n as a "suspect" ligand. Angew Chem Int Ed Engl 2013; 52:4673-5. [PMID: 23519944 DOI: 10.1002/anie.201209260] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 01/14/2013] [Indexed: 11/06/2022]
Abstract
The unusual suspects: Depending on co-ligands L(n) and the effects of substituents (R), the well-known triazenides [N(NR)2](-) may act as EPR detectable coordinated triazenyl ligands, [N(NR)2](·). They are thus new non-innocent ligands and are related to the hitherto unused non-innocent nitrogen dioxide ligand, [NO2](·).
Collapse
Affiliation(s)
- Fabian Ehret
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany
| | | | | | | |
Collapse
|
24
|
Das A, Scherer TM, Mondal P, Mobin SM, Kaim W, Lahiri GK. Experimental and DFT evidence for the fractional non-innocence of a β-diketonate ligand. Chemistry 2012; 18:14434-43. [PMID: 23001725 DOI: 10.1002/chem.201201785] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Indexed: 11/05/2022]
Abstract
New compounds [Ru(pap)(2)(L)](ClO(4)), [Ru(pap)(L)(2)], and [Ru(acac)(2)(L)] (pap = 2-phenylazopyridine, L(-) = 9-oxidophenalenone, acac(-) = 2,4-pentanedionate) have been prepared and studied regarding their electron-transfer behavior, both experimentally and by using DFT calculations. [Ru(pap)(2)(L)](ClO(4)) and [Ru(acac)(2)(L)] were characterized by crystal-structure analysis. Spectroelectrochemistry (EPR, UV/Vis/NIR), in conjunction with cyclic voltammetry, showed a wide range of about 2 V for the potential of the Ru(III/II) couple, which was in agreement with the very different characteristics of the strongly π-accepting pap ligand and the σ-donating acac(-) ligand. At the rather high potential of +1.35 V versus SCE, the oxidation of L(-) into L(⋅) could be deduced from the near-IR absorption of [Ru(III)(pap)(L(⋅))(L(-))](2+). Other intense long-wavelength transitions, including LMCT (L(-) → Ru(III)) and LL/CT (pap(⋅-) → L(-)) processes, were confirmed by TD-DFT results. DFT calculations and EPR data for the paramagnetic intermediates allowed us to assess the spin densities, which revealed two cases with considerable contributions from L-radical-involving forms, that is, [Ru(III)(pap(0))(2)(L(-))](2+) ↔ [Ru(II)(pap(0))(2)(L(⋅))](2+) and [Ru(III)(pap(0))(L(-))(2)](+) ↔ [Ru(II)(pap(0))(L(⋅))(L(-))](+). Calculations of electrogenerated complex [Ru(II)(pap(⋅-))(pap(0))(L(-))] displayed considerable negative spin density (-0.188) at the bridging metal.
Collapse
Affiliation(s)
- Amit Das
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076 (India)
| | | | | | | | | | | |
Collapse
|
25
|
Harder S, Spielmann J, Tobey B. Calcium-Amidoborane-Ammine Complexes: Thermal Decomposition of Model Systems. Chemistry 2012; 18:1984-91. [DOI: 10.1002/chem.201102029] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 09/21/2011] [Indexed: 11/06/2022]
|
26
|
Kaim W. The Shrinking World of Innocent Ligands: Conventionaland Non-Conventional Redox-Active Ligands. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201101359] [Citation(s) in RCA: 233] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
27
|
Tejel C, Asensio L, del Río MP, de Bruin B, López JA, Ciriano MA. Developing Synthetic Approaches with Non-Innocent Metalloligands: Easy Access to IrI/Pd0 and IrI/Pd0/IrI Cores. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104045] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
28
|
Tejel C, Asensio L, del Río MP, de Bruin B, López JA, Ciriano MA. Developing Synthetic Approaches with Non-Innocent Metalloligands: Easy Access to IrI/Pd0 and IrI/Pd0/IrI Cores. Angew Chem Int Ed Engl 2011; 50:8839-43. [DOI: 10.1002/anie.201104045] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2011] [Indexed: 11/10/2022]
|
29
|
Abstract
The potential of redox-active ligands to behave "noninnocently" in transition-metal coordination compounds is reflected with respect to various aspects and situations. These include the question of establishing "correct" oxidation states, the identification and characterization of differently charged radical ligands, the listing of structural and other consequences of ligand redox reactions, and the distinction between barrierless delocalized "resonance" cases M(n)/L(n) ↔ M(n+1)L(n-1) versus separated valence tautomer equilibrium situations M(n)/L(n) ⇌ M(n+1)L(n-1). Further ambivalence arises for dinuclear systems with radical bridge M(n)(μ-L(•))M(n) versus mixed-valent alternatives M(n+1)(μ-L(-))M(n), for noninnocent ligand-bridged coordination compounds of higher nuclearity such as (μ(3)-L)M(3), (μ(4)-L)M(4), (μ-L)(4)M(4), or coordination polymers. Conversely, the presence of more than one noninnocently behaving ligand at a single transition-metal site in situations such as L(n)-M-L(n-1) or L(•)-M-L(•) may give rise to corresponding ligand-to-ligand interaction phenomena (charge transfer, electron hopping, and spin-spin coupling) and to redox-induced electron transfer with counterintuitive oxidation-state changes. The relationships of noninnocent ligand behavior with excited-state descriptions and perspectives regarding material properties and single-electron or multielectron reactivity are also illustrated briefly.
Collapse
Affiliation(s)
- Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany.
| |
Collapse
|