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Sharma M, Perkins AM, Awoyemi RF, Schmittou AN, Raju S, Pierce BS, Donnadieu B, Wipf DO, Stokes SL, Emerson JP. Three water-soluble copper(II) N-heterocyclic carbene complexes: toward copper-catalyzed ketone reduction under sustainable conditions. Dalton Trans 2024. [PMID: 38247368 DOI: 10.1039/d3dt03406b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
A series of tridentate copper(II) N-heterocyclic carbene (NHC) complexes with imidazole, benzimidazole, and 5,6-dimethylbenzimidazole azole rings were synthesized and comprehensively characterized via X-ray crystallography, ESI-MS, cyclic voltammetry, and UV-Vis and EPR spectroscopic studies. These complexes were then utilized for the optimization of ketone reduction under sustainable conditions using 2-acetylpyridine and phenylsilane. The relationships between product formation, temperature, reaction time, and catalyst loading for the hydrogenation reactions are covered in detail. Reduction of eighteen different aliphatic, cyclic, and aromatic ketones were demonstrated, which were compatible to produce the corresponding products in moderate to good yields. These systems were used to develop related DNA-hybrid catalytic systems, but only supported weak enantioselectivity. Further thermodynamic experiments showed Cu-NHC complexes did not demonstrate specific binding to DNA, which is consistent with their limited selectivity.
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Affiliation(s)
- Mitu Sharma
- Department of Chemistry, Mississippi State University, Mississippi State, MS, USA.
| | - Amanda M Perkins
- Department of Chemistry, Mississippi State University, Mississippi State, MS, USA.
| | - Raymond Femi Awoyemi
- Department of Chemistry, Mississippi State University, Mississippi State, MS, USA.
| | - Allison N Schmittou
- Department of Chemistry and Biochemistry, University of Alabama, Tuscaloosa, AL, USA
| | - Selvam Raju
- Department of Chemistry, Mississippi State University, Mississippi State, MS, USA.
| | - Brad S Pierce
- Department of Chemistry and Biochemistry, University of Alabama, Tuscaloosa, AL, USA
| | - Bruno Donnadieu
- Department of Chemistry, Mississippi State University, Mississippi State, MS, USA.
| | - David O Wipf
- Department of Chemistry, Mississippi State University, Mississippi State, MS, USA.
| | - Sean L Stokes
- Department of Chemistry, Mississippi State University, Mississippi State, MS, USA.
| | - Joseph P Emerson
- Department of Chemistry, Mississippi State University, Mississippi State, MS, USA.
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2
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Mrózek O, Gernert M, Belyaev A, Mitra M, Janiak L, Marian CM, Steffen A. Ultra-Long Lived Luminescent Triplet Excited States in Cyclic (Alkyl)(amino)carbene Complexes of Zn(II) Halides. Chemistry 2022; 28:e202201114. [PMID: 35583397 PMCID: PMC9544448 DOI: 10.1002/chem.202201114] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Indexed: 01/19/2023]
Abstract
The high element abundance and d10 electron configuration make ZnII -based compounds attractive candidates for the development of novel photoactive molecules. Although a large library of purely fluorescent compounds exists, emission involving triplet excited states is a rare phenomenon for zinc complexes. We have investigated the photophysical and -chemical properties of a series of dimeric and monomeric ZnII halide complexes bearing a cyclic (alkyl)(amino)carbene (cAAC) as chromophore unit. Specifically, [(cAAC)XZn(μ-X)2 ZnX(cAAC)] (X=Cl (1), Br (2), I (3)) and [ZnX2 (cAAC)(NCMe)] (X=Br (4), I (5)) were isolated and fully characterized, showing intense visible light photoluminescence under UV irradiation at 297 K and fast photo-induced transformation. At 77 K, the compounds exhibit improved stability allowing to record ultra-long lifetimes in the millisecond regime. DFT/MRCI calculations confirm that the emission stems from 3 XCT/LEcAAC states and indicate the phototransformation to be related to asymmetric distortion of the complexes by cAAC ligand rotation. This study enhances our understanding of the excited state properties for future development and application of new classes of ZnII phosphorescent complexes.
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Affiliation(s)
- Ondřej Mrózek
- Faculty of Chemistry and Chemical BiologyTU Dortmund UniversityOtto-Hahn-Str. 644227DortmundGermany
| | - Markus Gernert
- Faculty of Chemistry and Chemical BiologyTU Dortmund UniversityOtto-Hahn-Str. 644227DortmundGermany
| | - Andrey Belyaev
- Faculty of Chemistry and Chemical BiologyTU Dortmund UniversityOtto-Hahn-Str. 644227DortmundGermany
| | - Mousree Mitra
- Faculty of Chemistry and Chemical BiologyTU Dortmund UniversityOtto-Hahn-Str. 644227DortmundGermany
| | - Lars Janiak
- Faculty of Chemistry and Chemical BiologyTU Dortmund UniversityOtto-Hahn-Str. 644227DortmundGermany
| | - Christel M. Marian
- Institute of Theoretical and Computational ChemistryHeinrich Heine University Düsseldorf40225DüsseldorfGermany
| | - Andreas Steffen
- Faculty of Chemistry and Chemical BiologyTU Dortmund UniversityOtto-Hahn-Str. 644227DortmundGermany
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3
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Richezzi M, Ferreyra J, Puzzolo J, Milesi L, Palopoli CM, Moreno DM, Hureau C, Signorella SR. Versatile Activity of a Copper(II) Complex Bearing a N4‐Tetradentate Schiff Base Ligand with Reduced Oxygen Species. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202101042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Micaela Richezzi
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Joaquín Ferreyra
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Juan Puzzolo
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Lisandro Milesi
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Claudia M. Palopoli
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Diego M. Moreno
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Christelle Hureau
- CNRS: Centre National de la Recherche Scientifique LCC - Laboratoire de Chimie de Coordination FRANCE
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Ahmad Bhat I, Avinash I, Kumar Sachan S, Singh S, Anantharaman G. Efficient Synthesis of Cu(II)‐
N
‐Heterocyclic Carbene Complexes in Water and Their Activity Towards Aerobic Alcohol Oxidation. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100631] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Irshad Ahmad Bhat
- Department of Chemistry Indian Institute of Technology Kanpur Kanpur 208016 India
| | - Iruthayaraj Avinash
- Department of Chemistry Indian Institute of Technology Kanpur Kanpur 208016 India
| | - Sharad Kumar Sachan
- Department of Chemistry Indian Institute of Technology Kanpur Kanpur 208016 India
| | - Sadhana Singh
- Department of Chemistry Indian Institute of Technology Kanpur Kanpur 208016 India
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5
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Nylund PVS, Ségaud NC, Albrecht M. Highly Modular Piano-Stool N-Heterocyclic Carbene Iron Complexes: Impact of Ligand Variation on Hydrosilylation Activity. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00200] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pamela V. S. Nylund
- Department of Chemistry & Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Nathalie C. Ségaud
- Department of Chemistry & Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Martin Albrecht
- Department of Chemistry & Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
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Cope JD, Sheridan PE, Galloway CJ, Awoyemi RF, Stokes SL, Emerson JP. Synthesis and Characterization of a Tetradentate, N-Heterocyclic Carbene Copper(II) Complex and Its Use as a Chan–Evans–Lam Coupling Catalyst. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00552] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- James D. Cope
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Patrick E. Sheridan
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Christopher J. Galloway
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Raymond Femi Awoyemi
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Sean L. Stokes
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Joseph P. Emerson
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
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Delaude L. The Chemistry of Azolium‐Carboxylate Zwitterions and Related Compounds: a Survey of the Years 2009–2020. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000639] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Lionel Delaude
- Laboratory of CatalysisMolSys Research UnitInstitut de Chimie Organique (B6a)Université de Liège Allée du six Août 13 4000 Liège Belgium
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Dong Z, Pezzato C, Sienkiewicz A, Scopelliti R, Fadaei-Tirani F, Severin K. SET processes in Lewis acid-base reactions: the tritylation of N-heterocyclic carbenes. Chem Sci 2020; 11:7615-7618. [PMID: 34094138 PMCID: PMC8159480 DOI: 10.1039/d0sc01278e] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Reactions between N-heterocyclic carbenes (NHCs) and the trityl cation, [Ph3C]+, give covalent adducts of type [NHC-CPh3]+ and/or [NHC-C6H5-CPh2]+. EPR spectroscopy, UV-Vis analyses, and trapping experiments imply that adduct formation involves carbene radical cations and the trityl radical. The results demonstrate that single electron transfer (SET) processes should be considered for reaction of NHCs with oxidizing Lewis acids.
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Affiliation(s)
- Zhaowen Dong
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Cristian Pezzato
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | | | - Rosario Scopelliti
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Farzaneh Fadaei-Tirani
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Kay Severin
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
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