1
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Kass D, Larson VA, Corona T, Kuhlmann U, Hildebrandt P, Lohmiller T, Bill E, Lehnert N, Ray K. Trapping of a phenoxyl radical at a non-haem high-spin iron(II) centre. Nat Chem 2024; 16:658-665. [PMID: 38216752 DOI: 10.1038/s41557-023-01405-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Accepted: 11/17/2023] [Indexed: 01/14/2024]
Abstract
The activation of dioxygen at haem and non-haem metal centres, and subsequent functionalization of unactivated C‒H bonds, has been a focal point of much research. In iron-mediated oxidation reactions, O2 binding at an iron(II) centre is often accompanied by an oxidation of the iron centre. Here we demonstrate dioxygen activation by sodium tetraphenylborate and protons in the presence of an iron(II) complex to form a reactive radical species, whereby the iron oxidation state remains unaltered in the presence of a highly oxidizing phenoxyl radical and O2. This complex, containing an unusual iron(II)-phenoxyl radical motif, represents an elusive example of a spectroscopically characterized oxygen-derived iron(II)-reactive intermediate during chemical and biological dioxygen activation at haem and non-haem iron active centres. The present report opens up strategies for the stabilization of a phenoxyl radical cofactor, with its full oxidizing capabilities, to act as an independent redox centre next to an iron(II) site during substrate oxidation reactions.
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Affiliation(s)
- Dustin Kass
- Department of Chemistry, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Virginia A Larson
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, MI, USA
| | - Teresa Corona
- Department of Chemistry, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Uwe Kuhlmann
- Department of Chemistry, Technische Universität Berlin, Berlin, Germany
| | - Peter Hildebrandt
- Department of Chemistry, Technische Universität Berlin, Berlin, Germany
| | - Thomas Lohmiller
- Department of Chemistry, Humboldt-Universität zu Berlin, Berlin, Germany
- EPR4Energy Joint Lab, Department Spins in Energy Conversion and Quantum Information Science, Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany
| | - Eckhard Bill
- Max-Planck-Institut für Chemische Energiekonversion, Mülheim an der Ruhr, Germany
| | - Nicolai Lehnert
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, MI, USA.
| | - Kallol Ray
- Department of Chemistry, Humboldt-Universität zu Berlin, Berlin, Germany.
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2
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Porte V, Milunovic MNM, Knof U, Leischner T, Danzl T, Kaiser D, Gruene T, Zalibera M, Jelemenska I, Bucinsky L, Jannuzzi SAV, DeBeer S, Novitchi G, Maulide N, Arion VB. Chemical and Redox Noninnocence of Pentane-2,4-dione Bis( S-methylisothiosemicarbazone) in Cobalt Complexes and Their Application in Wacker-Type Oxidation. JACS AU 2024; 4:1166-1183. [PMID: 38559722 PMCID: PMC10976605 DOI: 10.1021/jacsau.4c00005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/09/2024] [Accepted: 02/15/2024] [Indexed: 04/04/2024]
Abstract
Cobalt complexes with multiproton- and multielectron-responsive ligands are of interest for challenging catalytic transformations. The chemical and redox noninnocence of pentane-2,4-dione bis(S-methylisothiosemicarbazone) (PBIT) in a series of cobalt complexes has been studied by a range of methods, including spectroscopy [UV-vis, NMR, electron paramagnetic resonance (EPR), X-ray absorption spectroscopy (XAS)], cyclic voltammetry, X-ray diffraction, and density functional theory (DFT) calculations. Two complexes [CoIII(H2LSMe)I]I and [CoIII(LSMe)I2] were found to act as precatalysts in a Wacker-type oxidation of olefins using phenylsilane, the role of which was elucidated through isotopic labeling. Insights into the mechanism of the catalytic transformation as well as the substrate scope of this selective reaction are described, and the essential role of phenylsilane and the noninnocence of PBIT are disclosed. Among the several relevant species characterized was an unprecedented Co(III) complex with a dianionic diradical PBIT ligand ([CoIII(LSMe••)I]).
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Affiliation(s)
- Vincent Porte
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Miljan N. M. Milunovic
- University
of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria
| | - Ulrich Knof
- Novartis
Pharma AG, CH-4056 Basel, Switzerland
| | - Thomas Leischner
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Tobias Danzl
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Daniel Kaiser
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Tim Gruene
- University
of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria
| | - Michal Zalibera
- Institute
of Physical Chemistry and Chemical Physics, Faculty of Chemical and
Food Technology, Slovak University of Technology
in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Ingrid Jelemenska
- Institute
of Physical Chemistry and Chemical Physics, Faculty of Chemical and
Food Technology, Slovak University of Technology
in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Lukas Bucinsky
- Institute
of Physical Chemistry and Chemical Physics, Faculty of Chemical and
Food Technology, Slovak University of Technology
in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Sergio A. V. Jannuzzi
- Max
Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max
Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | | | - Nuno Maulide
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Vladimir B. Arion
- University
of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria
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3
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Arora S, Rawal P, Gupta P. Orbital Analysis Captures the Existence of a Mixed-Valent Cu III -O-Cu II Active-Site and its Role in Water-Assisted Aliphatic Hydroxylation. Chemistry 2024; 30:e202303722. [PMID: 38168869 DOI: 10.1002/chem.202303722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/31/2023] [Accepted: 01/03/2024] [Indexed: 01/05/2024]
Abstract
The Cu-O-Cu core has been proposed as a potential site for methane oxidation in particulate methane monooxygenase. In this work, we used density functional theory (DFT) to design a mixed-valent CuIII -O-CuII species from an experimentally known peroxo-dicopper complex supported by N-donor ligands containing phenolic groups. We found that the transfer of two-protons and two-electrons from phenolic groups to peroxo-dicopper core takes place, which results to the formation of a bis-μ-hydroxo-dicopper core. The bis-μ-hydroxo-dicopper core converts to a mixed-valent CuIII -O-CuII core with the removal of a water molecule. The orbital and spin density analyses unravel the mixed-valent nature of CuIII -O-CuII . We further investigated the reactivity of this mixed-valent core for aliphatic C-H hydroxylation. Our study unveiled that mixed-valent CuIII -O-CuII core follows a hydrogen atom transfer mechanism for C-H activation. An in-situ generated water molecule plays an important role in C-H hydroxylation by acting as a proton transfer bridge between carbon and oxygen. Furthermore, to assess the relevance of a mixed-valent CuIII -O-CuII core, we investigated aliphatic C-H activation by a symmetrical CuII -O-CuII core. DFT results show that the mixed-valent CuIII -O-CuII core is more reactive toward the C-H bond than the symmetrical CuII -O-CuII core.
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Affiliation(s)
- Sumangla Arora
- Computational Catalysis Center, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667
| | - Parveen Rawal
- Computational Catalysis Center, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667
| | - Puneet Gupta
- Computational Catalysis Center, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667
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4
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Takeyama T, Shimazaki Y. Diversity of oxidation state in copper complexes with phenolate ligands. Dalton Trans 2024; 53:3911-3929. [PMID: 38319292 DOI: 10.1039/d3dt04230h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
The phenoxyl radical binding copper complexes have been widely developed and their detailed geometric and electronic structures have been clarified. While many one-electron oxidized CuII-phenolate complexes have been reported previously, recent studies of the Cu-phenolate complexes proceed toward elucidation of the complexes with other oxidation states, such as the phenoxyl radical binding CuI complexes and CuIV-phenolate complexes in the formal oxidation state. This Perspective focuses on new aspects of the properties and reactivities of various Cu-phenolate and Cu-phenoxyl radical complexes with emphasis on the relationship between geometric and electronic structures.
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Affiliation(s)
- Tomoyuki Takeyama
- Department of Applied Chemistry, Sanyo-Onoda City University, 1-1-1, Daigakudori, Sanyo-Onoda, 756-0884 Yamaguchi, Japan.
| | - Yuichi Shimazaki
- College of Science, Ibaraki University, Bunkyo, Mito 310-8512, Japan.
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5
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Singh O, Singh A, Maji A, Chauhan R, Gupta P, Ghosh K. Crystal structure of a phenoxyl radical complex relevant to the metal site of the galactose oxidase enzyme: A facile one-pot synthesis, evidence for hydrogen atom transfer and DNA cleavage via self-activation. Dalton Trans 2024; 53:986-995. [PMID: 38088032 DOI: 10.1039/d3dt03282e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2024]
Abstract
Copper complexes [Cu(L1H)ClO4] (1) and [Cu(L2)NO3] (2), which are relevant to the metal site of the galactose oxidase enzyme, were synthesized and characterized by different spectroscopic methods. L1H2 and L2H2 [where L1H2 stands for 2,2'-((1E,1'E)(2,2'-(pyridine-2,6-diyl)bis(2-phenylhydrazin-2-yl-1-ylidene))bis(methanylylidene))diphenol and L2H2 stands for 6,6'-((1E,1'E)-(2,2'-(pyridine-2,6-diyl)bis(2-phenylhydrazin-2-yl-1-ylidene))bis(methanylylidene))bis(2,4-di-tert-butylphenol), H stands for dissociable proton] are pentadentate ligands. These ligands provide pyridyl N, two imine N, and two non-innocent phenoxyl and phenolato O donors, forming complex 1 as a non-radical complex, while complex 2 is a phenoxyl radical complex. The molecular structures of complexes 1 and 2 were authenticated by X-ray crystallography. Benzyl alcohol oxidation was investigated, and the conversion of 9,10-dihydroanthracene to anthracene was examined to scrutinize the H-atom abstraction reaction. Nuclease activity with complexes 1 and 2 was investigated by self-activated plasmid DNA (pBR322) cleavage. Non-innocent properties of the ligand-containing phenolato function were investigated by DFT calculations.
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Affiliation(s)
- Ovender Singh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Anshu Singh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Ankur Maji
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Rahul Chauhan
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Puneet Gupta
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Kaushik Ghosh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
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6
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Mehara J, Roithová J. Copper(II)‐TEMPO Interaction. Isr J Chem 2023. [DOI: 10.1002/ijch.202300011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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7
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Singh R, Bains AK, Kundu A, Jain H, Yadav S, Dey D, Adhikari D. Mechanistic Elucidation of an Alcohol Oxidation Reaction Promoted by a Nickel Azophenolate Complex. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Affiliation(s)
- Rahul Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Amreen K. Bains
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Abhishek Kundu
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Harshit Jain
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Sudha Yadav
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Dhananjay Dey
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Debashis Adhikari
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
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8
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Salicylaldehyde and D-(+)-galactose functionalized chitosan oligosaccharide nanoparticles as carriers for sustained release of pesticide with enhanced UV stability. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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9
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Chandra P. A Review on the Consequence of 3D-Orienation of Cu/TEMPO/Imidazole Sequence on Selective Alcohol Oxidation. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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10
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Wong ZM, Yong X, Deng T, Shi W, Wu G, Li N, Luo HK, Yang SW. Neutral Antiaromatic Bis(1,2-dithiolene)-Chelated Nickel Complexes Bearing Multiradical Characters. J Phys Chem A 2022; 126:5552-5558. [PMID: 35971272 DOI: 10.1021/acs.jpca.2c04134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metal-organic complexes with radical characteristics are unique species attracting immense attention in recent years due to their peculiar properties and promising applicability in a wide variety of innovative research fields. However, the reported complexes typically do not exceed diradicality. This study systematically investigates a series of square planar neutral Ni-bis(1,2-dithiolene) and Ni-bis(1,2-dioxolene) complexes with linear, branched, and macrocyclic configurations via ab initio calculations. The linear Ni-complexes display strong singlet diradical characters, while their branched counterparts can also exhibit moderate singlet multiradical characters. Importantly, the macrocyclic Ni-complexes can possess extremely strong singlet multiradical characters up to dodeca-radicality along with their global antiaromaticity and hence strong induced ring current in the presence of an external magnetic field, ascribed to the localization of unpaired α and β electrons residing in the highest few molecular orbitals at different molecular sites, minimizing their coupling and annihilation. Our work represents the first indication in the rational design of novel multiradical neutral antiaromatic macrocyclic complexes for potential applications in molecular machines and electronic devices.
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Affiliation(s)
- Zicong Marvin Wong
- Institute of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Singapore
| | - Xue Yong
- Department of Chemistry, University of Sheffield, Dainton Building, Brook Hill, Sheffield, Yorkshire S3 7HF, U. K
| | - Tianqi Deng
- State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China.,Institute of Advanced Semiconductors & Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, Zhejiang 311200, China
| | - Wen Shi
- School of Chemistry, Sun Yat-sen University, Guangzhou 510006, China
| | - Gang Wu
- Institute of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Singapore
| | - Ning Li
- Institute of Bioengineering and Bioimaging, Agency for Science, Technology and Research, 31 Biopolis Way, Singapore 138669, Singapore
| | - He-Kuan Luo
- Institute of Sustainability for Chemicals, Energy and Environment, Agency for Science, Technology and Research, 1 Pesek Road, Jurong Island, Singapore 627833, Singapore
| | - Shuo-Wang Yang
- Institute of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Singapore
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11
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Kumar M, Ahmad S, Ali A. Catalytic Reactivity Supported by Redox-Active Ligands Framing: A Mini Review. RUSS J INORG CHEM+ 2022. [DOI: 10.1134/s0036023622100278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Dobrov A, Darvasiová D, Zalibera M, Bučinský L, Jelemenská I, Rapta P, Shova S, Dumitrescu DG, Andrade MA, Martins LMDRS, Pombeiro AJL, Arion VB. Diastereomeric dinickel(II) complexes with non-innocent bis(octaazamacrocyclic) ligands: isomerization, spectroelectrochemistry, DFT calculations and use in catalytic oxidation of cyclohexane. Dalton Trans 2022; 51:5151-5167. [PMID: 35266945 PMCID: PMC8962992 DOI: 10.1039/d2dt00154c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 02/28/2022] [Indexed: 11/21/2022]
Abstract
Diastereomeric dinickel(II) complexes with bis-octaazamacrocyclic 15-membered ligands [Ni(L1-3-L1-3)Ni] (4-6) have been prepared by oxidative dehydrogenation of nickel(II) complexes NiL1-3 (1-3) derived from 1,2- and 1,3-diketones and S-methylisothiocarbohydrazide. The compounds were characterized by elemental analysis, ESI mass spectrometry, and IR, UV-vis, 1H NMR, and 13C NMR spectroscopy. Single crystal X-ray diffraction (SC-XRD) confirmed the isolation of the anti and syn isomers of bis-octaazamacrocyclic dinickel(II) complexes 4a and 4s, the syn-configuration of 5s and the anti-configuration of the dinickel(II) complex 6a. Dimerization of prochiral nickel(II) complexes 1-3 generates two chiral centers at the bridging carbon atoms. The anti-complexes were isolated as meso-isomers (4a and 6a) and the syn-compounds as racemic mixtures of R,R/S,S-enantiomers (4s and 5s). The syn-anti isomerization (epimerization) of the isolated complexes in chloroform was disclosed. The isomerization kinetics of 5a was monitored at five different temperatures ranging from 20 °C to 50 °C by 1H NMR spectroscopy indicating the clean conversion of 5a into 5s. The activation barrier determined from the temperature dependence of the rate constants via the Eyring equation was found to be ΔH‡ = 114 ± 1 kJ mol-1 with activation entropy ΔS‡ = 13 ± 3 J K-1 mol-1. The complexes contain two low-spin nickel(II) ions in a square-planar coordination environment. The electrochemical behavior of 4a, 4s, 5s and 6a and the electronic structure of the oxidized species were studied by UV-vis-NIR-spectroelectrochemistry (SEC) and DFT calculations indicating the redox non-innocent behavior of the complexes. The dinickel(II) complexes 4a, 4s, 5s and 6a/6s were investigated as catalysts for microwave-assisted solvent-free oxidation of cyclohexane by tert-butyl hydroperoxide to produce a mixture of cyclohexanone and cyclohexanol (KA oil). The best value for KA oil yield (16%) was obtained with a mixture of 6a/6s after 2 h of microwave irradiation at 100 °C.
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Affiliation(s)
- Anatolie Dobrov
- University of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria.
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, 1090 Wien, Austria
| | - Denisa Darvasiová
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic.
| | - Michal Zalibera
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic.
| | - Lukáš Bučinský
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic.
| | - Ingrid Jelemenská
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic.
- Department of Chemistry, Faculty of Natural Sciences, Constantine the Philosopher University in Nitra, 949 74 Nitra, Slovak Republic
| | - Peter Rapta
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic.
| | - Sergiu Shova
- Inorganic Polymers Department, "Petru Poni" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, Iasi 700487, Romania
| | - Dan G Dumitrescu
- Elettra - Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163, 5 in AREA Science Park 34149 Basovizza, Trieste, Italy
| | - Marta A Andrade
- Centro de Química Estrutural, Institute of Molecular Sciences, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Luísa M D R S Martins
- Centro de Química Estrutural, Institute of Molecular Sciences, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Armando J L Pombeiro
- Centro de Química Estrutural, Institute of Molecular Sciences, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
- Peoples' Friendship University of Russia (RUDN University), Research Institute of Chemistry, 6 Miklukho-Maklaya Street, Moscow 117198, Russian Federation
| | - Vladimir B Arion
- University of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria.
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13
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π-π Stacking Interaction of Metal Phenoxyl Radical Complexes. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27031135. [PMID: 35164397 PMCID: PMC8840625 DOI: 10.3390/molecules27031135] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/29/2022] [Accepted: 02/02/2022] [Indexed: 11/17/2022]
Abstract
π-π stacking interaction is well-known to be one of the weak interactions. Its importance in the stabilization of protein structures and functionalization has been reported for various systems. We have focused on a single copper oxidase, galactose oxidase, which has the π-π stacking interaction of the alkylthio-substituted phenoxyl radical with the indole ring of the proximal tryptophan residue and catalyzes primary alcohol oxidation to give the corresponding aldehyde. This stacking interaction has been considered to stabilize the alkylthio-phenoxyl radical, but further details of the interaction are still unclear. In this review, we discuss the effect of the π-π stacking interaction of the alkylthio-substituted phenoxyl radical with an indole ring.
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14
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Mondal R, Guin AK, Chakraborty G, Paul ND. Metal-ligand cooperative approaches in homogeneous catalysis using transition metal complex catalysts of redox noninnocent ligands. Org Biomol Chem 2022; 20:296-328. [PMID: 34904619 DOI: 10.1039/d1ob01153g] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Catalysis offers a straightforward route to prepare various value-added molecules starting from readily available raw materials. The catalytic reactions mostly involve multi-electron transformations. Hence, compared to the inexpensive and readily available 3d-metals, the 4d and 5d-transition metals get an extra advantage for performing multi-electron catalytic reactions as the heavier transition metals prefer two-electron redox events. However, for sustainable development, these expensive and scarce heavy metal-based catalysts need to be replaced by inexpensive, environmentally benign, and economically affordable 3d-metal catalysts. In this regard, a metal-ligand cooperative approach involving transition metal complexes of redox noninnocent ligands offers an attractive alternative. The synergistic participation of redox-active ligands during electron transfer events allows multi-electron transformations using 3d-metal catalysts and allows interesting chemical transformations using 4d and 5d-metals as well. Herein we summarize an up-to-date literature report on the metal-ligand cooperative approaches using transition metal complexes of redox noninnocent ligands as catalysts for a few selected types of catalytic reactions.
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Affiliation(s)
- Rakesh Mondal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur Botanic Garden, Howrah 711103, India.
| | - Amit Kumar Guin
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur Botanic Garden, Howrah 711103, India.
| | - Gargi Chakraborty
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur Botanic Garden, Howrah 711103, India.
| | - Nanda D Paul
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur Botanic Garden, Howrah 711103, India.
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15
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Shanmugam M, Kumar P, Sen A, Rajaraman G. An Unusual Mixed Valent Cobalt Dimer as a Catalyst for Anti-Markovnikov Hydrophophination of Alkynes. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00112h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of [Co(PMe3)4] (1) with a redox-active NNN pincer ligand (L1) led us to isolate a unique binuclear cobalt complex ([(PMe3)2CoII(L13-)CoI(PMe3)3] (2)) anchored by a three electron reduced L1...
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16
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Shimada S, Yin SF, Bao M. A new C-anionic tripodal ligand 2-{bis(benzothiazolyl)(methoxy)methyl}phenyl and its bismuth complexes. Dalton Trans 2021; 50:7949-7954. [PMID: 34096567 DOI: 10.1039/d1dt01071a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
A new tripodal C-anionic ligand, 2-{bis(benzothiazolyl)(methoxy)methyl}phenyl (L), was stably generated by the reaction of the ligand precursor (L'), the corresponding bromide (2-BrC6H4)(MeO)C(C7H4NS)2 (C7H4NS = 2-benzothiazolyl), with nBuLi at -104 °C in the presence of TMEDA (N,N,N',N'-tetramethylethylenediamine). The ligand lithium salt reacted with BiCl3 to give a 2 : 1 complex L2BiCl. A 1 : 1 complex LBiCl2 was obtained in good yield by the redistribution reaction between L2BiCl and BiCl3. X-ray diffraction analysis revealed that the ligand L coordinated in an expected κ3-C,N,N' coordination mode in LBiCl2, while it coordinated in κ3-C,N,O and κ2-C,O coordination modes in L2BiCl. The ligand precursor reacted with BiX3 (X = Cl, Br) to give 1 : 1 complexes L'BiX3 and was found to act as a neutral tripodal C(π),N,N-ligand.
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Affiliation(s)
- Shigeru Shimada
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
| | - Shuang-Feng Yin
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Ming Bao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, P. R. China
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17
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Karuppasamy P, Thiruppathi D, Ganesan M, Rajendran T, Rajagopal S, Sivasubramanian VK, Rajapandian V. Electrocatalytic Oxidation of L-Cysteine, L-Methionine, and Methionine–Glycine Using [Oxoiron(IV)–Salen] Ion Immobilized Glassy Carbon Electrode. Electrocatalysis (N Y) 2021. [DOI: 10.1007/s12678-021-00652-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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18
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Synthetic methodology, structures and properties of mixed valence copper(I/II) complexes with various Schiff bases and their reduced analogues. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Oxidative cyclization and synthesis of benzoxazole derivatives and hydrolytic phosphatase activity studies on dinuclear diphenoxo-bridged zinc(II)complexes. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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20
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Hong X, Huo D, Jiang W, Long W, Leng J, Tong L, Liu Z. Electrocatalytic and Photocatalytic Hydrogen Evolution by Ni(II) and Cu(II) Schiff Base Complexes. ChemElectroChem 2020. [DOI: 10.1002/celc.202001461] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Xiao‐Shuo Hong
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials Guangzhou University No. 230 Wai Huan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 P. R. China
| | - Debiao Huo
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials Guangzhou University No. 230 Wai Huan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 P. R. China
| | - Wen‐Jing Jiang
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials Guangzhou University No. 230 Wai Huan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 P. R. China
| | - Wei‐Jian Long
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials Guangzhou University No. 230 Wai Huan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 P. R. China
| | - Ji‐Dong Leng
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials Guangzhou University No. 230 Wai Huan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 P. R. China
| | - Lianpeng Tong
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials Guangzhou University No. 230 Wai Huan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 P. R. China
| | - Zhao‐Qing Liu
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials Guangzhou University No. 230 Wai Huan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 P. R. China
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21
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Dobrov A, Fesenko A, Yankov A, Stepanenko I, Darvasiová D, Breza M, Rapta P, Martins LMDRS, Pombeiro AJL, Shutalev A, Arion VB. Nickel(II), Copper(II) and Palladium(II) Complexes with Bis-Semicarbazide Hexaazamacrocycles: Redox-Noninnocent Behavior and Catalytic Activity in Oxidation and C-C Coupling Reactions. Inorg Chem 2020; 59:10650-10664. [PMID: 32649194 DOI: 10.1021/acs.inorgchem.0c01119] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nickel(II), copper(II), and palladium(II) complexes MLH, where M = Ni (1), Cu (2), Pd (3), and MLOMe, where M = Ni (4), Cu (5), Pd (6), have been prepared by reactions of NiCl2·6H2O, Cu(OAc)2·H2O, and PdCl2(MeCN)2 with 14-membered bis-semicarbazide hexaazamacrocycles H2LH and H2LOMe in dimethylformamide (DMF). The compounds were characterized by elemental analysis, ESI mass spectrometry, IR, UV-vis, and 1D (1H, 13C) and 2D (1H-1H COSY, 1H-1H TOCSY, 1H-1H NOESY, 1H-13C HSQC, 1H-13C HMBC) NMR spectra (1, 3, 4, and 6), and X-ray diffraction (2, 4-6). The complexes with MIIN4 coordination environment have S = 0, 1/2, 0 ground states for Ni, Cu, and Pd, respectively. The electrochemical behavior of 1-6 was investigated in detail. The electronic structures of 1e-oxidized species were studied by EPR, UV-vis-NIR spectroelectrochemistry, and DFT calculations, indicating the redox-noninnocent behavior of the ligands. Compounds 1-6 were tested in the oxidation of styrene and C-C coupling (Henry and Knoevenagel condensations). Compounds 2 and 5 selectively catalyze the microwave-assisted oxidation of neat styrene to benzaldehyde (up to 88% yield), whereas the 1 and 4 catalytic systems afforded up to 99% β-nitroethanol yield with an appreciable diastereoselectivity toward the formation of the anti isomer.
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Affiliation(s)
- Anatolie Dobrov
- University of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria.,Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Altanstraße 14, 1090 Wien, Austria
| | - Anastasia Fesenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Ave., 119991 Moscow, Russian Federation
| | - Alexander Yankov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Ave., 119991 Moscow, Russian Federation
| | - Iryna Stepanenko
- University of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria
| | - Denisa Darvasiová
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Martin Breza
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Peter Rapta
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Luísa M D R S Martins
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Armando J L Pombeiro
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Anatoly Shutalev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Ave., 119991 Moscow, Russian Federation
| | - Vladimir B Arion
- University of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria
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22
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Oshita H, Shimazaki Y. Recent Advances in One-Electron-Oxidized Cu II -Diphenoxide Complexes as Models of Galactose Oxidase: Importance of the Structural Flexibility in the Active Site. Chemistry 2020; 26:8324-8340. [PMID: 32056294 DOI: 10.1002/chem.201905877] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Indexed: 11/09/2022]
Abstract
The phenoxyl radical plays important roles in biological systems as cofactors in some metalloenzymes, such as galactose oxidase (GO) catalyzing oxidation of primary alcohols to give the corresponding aldehydes. Many metal(II)-phenoxyl radical complexes have hitherto been studied for understanding the detailed properties and reactivities of GO, and thus the nature of GO has gradually become clearer. However, the effects of the subtle geometric and electronic structural changes at the active site of GO, especially the structural change in the catalytic cycle and the effect of the second coordination sphere, have not been fully discussed yet. In this Review, we focus on further details of the model studies of GO and discuss the importance of the structural change at the active site of GO.
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Affiliation(s)
- Hiromi Oshita
- Faculty of Chemistry of Functional Molecules, Konan University, Higashinada-ku, Kobe, 658-8501, Japan
| | - Yuichi Shimazaki
- Graduate School of Science and Engineering, Ibaraki University, Bunkyo, Mito, 310-8512, Japan
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23
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Dinda S, Roy S, Patra SC, Bhandary S, Pramanik K, Ganguly S. Polyaromatic hydrocarbon derivatized azo-oximes of cobalt( iii) for the ligand-redox controlled electrocatalytic oxygen reduction reaction. NEW J CHEM 2020. [DOI: 10.1039/c9nj05527d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Two new polyaromatic hydrocarbon (PAH) derivatized cobalt(iii) azo-oxime complexes were synthesized and their activity in electrocatalytic oxygen reduction reaction (ORR) were explored.
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Affiliation(s)
- Soumitra Dinda
- Department of Chemistry
- St. Xavier's College (Autonomous)
- Kolkata–700016
- India
| | - Syamantak Roy
- Molecular Materials Laboratory
- Chemistry and Physics of Materials Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Jakkur
- Bangalore
| | | | - Subhrajyoti Bhandary
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal By-pass Road
- Bhauri
- Bhopal
| | | | - Sanjib Ganguly
- Department of Chemistry
- St. Xavier's College (Autonomous)
- Kolkata–700016
- India
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24
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Nasibipour M, Safaei E, Wrzeszcz G, Wojtczak A. Tuning of the redox potential and catalytic activity of a new Cu(ii) complex byo-iminobenzosemiquinone as an electron-reservoir ligand. NEW J CHEM 2020. [DOI: 10.1039/c9nj06396j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The synthesis and characterization of a new Cu(ii) complex, LNIS2CuII(LNIS=o-iminobenzosemiquinone), are reported.
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Affiliation(s)
| | - Elham Safaei
- Department of Chemistry
- College of Sciences
- Shiraz
- Iran
| | - Grzegorz Wrzeszcz
- Faculty of Chemistry
- Nicolaus Copernicus University in Torun
- 87-100 Torun
- Poland
| | - Andrzej Wojtczak
- Faculty of Chemistry
- Nicolaus Copernicus University in Torun
- 87-100 Torun
- Poland
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25
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Chakraborty M, Mondal A, Chattopadhyay SK. Structural divergence in binuclear Cu(ii) pyridoxal Schiff base complexes probed by co-ligands: catecholase mimetic activity and sulphide ion sensing. NEW J CHEM 2020. [DOI: 10.1039/d0nj00719f] [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
Three Cu(ii) complexes showing efficient catecholase activity, with pronounced solvent sensitivity, S2−sensing ability in micromolar concentrations, and coligand dependent denticity of the pyridoxal Schiff base ligand are reported.
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Affiliation(s)
- Moumita Chakraborty
- Department of Chemistry
- Indian Institute of Engineering Science and Technology
- Shibpur
- Howrah 711103
- India
| | - Antu Mondal
- Department of Chemistry
- Indian Institute of Engineering Science and Technology
- Shibpur
- Howrah 711103
- India
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26
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Elsby MR, Baker RT. Strategies and mechanisms of metal–ligand cooperativity in first-row transition metal complex catalysts. Chem Soc Rev 2020; 49:8933-8987. [DOI: 10.1039/d0cs00509f] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The use of metal–ligand cooperation (MLC) by transition metal bifunctional catalysts has emerged at the forefront of homogeneous catalysis science.
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Affiliation(s)
- Matthew R. Elsby
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation
- University of Ottawa
- Ottawa
- Canada
| | - R. Tom Baker
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation
- University of Ottawa
- Ottawa
- Canada
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27
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Suzuki T, Oshita H, Yajima T, Tani F, Abe H, Shimazaki Y. Formation of the Cu II -Phenoxyl Radical by Reaction of O 2 with a Cu II -Phenolate Complex via the Cu I -Phenoxyl Radical. Chemistry 2019; 25:15805-15814. [PMID: 31486552 DOI: 10.1002/chem.201903077] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 08/11/2019] [Indexed: 01/13/2023]
Abstract
Reaction of Cu(ClO4 )2 ⋅6 H2 O with a tripodal 2N2O ligand, H2 Me2 NL, having a p-(dimethylamino)phenol moiety, in CH2 Cl2 /MeOH (1:1 v/v) under basic conditions under an inert gas atmosphere gave [Cu(Me2 NL)(H2 O)] (1). The same reaction carried out under aerobic conditions gave [Cu(Me2 NL)(MeOH)]ClO4 (2), which could be obtained also from the isolated complex 1 by reaction with O2 in CH2 Cl2 /MeOH. The X-ray crystal structures of 1 and 2 revealed similar square-pyramidal structures, but 2 showed the (dimethylamino)phenoxyl radical features. Complex 1 exhibits characteristic CuII EPR signals of the d x 2 - y 2 ground state in CH2 Cl2 /MeOH at 77 K, whereas 2 is EPR-silent. The EPR and X-ray absorption fine structure (XAFS) results suggest that 2 is assigned to the CuII -(dimethylamino)phenoxyl radical. However, complex 1 showed different features in the absence of MeOH. The EPR spectrum of the CH2 Cl2 solution of 1 exhibits distortion from the d x 2 - y 2 ground state and a temperature-dependent equilibrium between the CuII -(dimethylamino)phenolate and the CuI -(dimethylamino)phenoxyl radical. From these results, CuII -phenoxyl radical complex 2 is concluded to be formed by the reaction of 1 with O2 via the CuI -phenoxyl radical species.
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Affiliation(s)
- Takashi Suzuki
- Graduate School of Science and Engineering, Ibaraki University, Mito, 310-8512, Japan
| | - Hiromi Oshita
- Faculty of Chemistry of Functional Molecules, Konan University, Higashinada-ku, Kobe, 658-8501, Japan
| | - Tatsuo Yajima
- Faculty of Chemistry, Materials and Bioengineering, Kansai University, Suita, Osaka, 564-8680, Japan
| | - Fumito Tani
- Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-Ku, Fukuoka, 819-0395, Japan
| | - Hitoshi Abe
- Institute of Materials Structure Science (IMSS), High Energy Accelerator Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, SOKENDAI (Graduate University for Advanced Studies), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan
| | - Yuichi Shimazaki
- Graduate School of Science and Engineering, Ibaraki University, Mito, 310-8512, Japan
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28
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Dobrov A, Darvasiová D, Zalibera M, Bučinský L, Puškárová I, Rapta P, Shova S, Dumitrescu D, Martins LMDRS, Pombeiro AJL, Arion VB. Nickel(II) Complexes with Redox Noninnocent Octaazamacrocycles as Catalysts in Oxidation Reactions. Inorg Chem 2019; 58:11133-11145. [PMID: 31373487 DOI: 10.1021/acs.inorgchem.9b01700] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nickel(II) complexes with 15-membered (1-5) and 14-membered (6) octaazamacrocyclic ligands derived from 1,2- and 1,3-diketones and S-methylisothiocarbohydrazide were prepared by template synthesis. The compounds were characterized by elemental analysis, electrospray ionization mass spectrometry, IR, UV-vis, 1H NMR spectroscopies, and X-ray diffraction. The complexes contain a low-spin nickel(II) ion in a square-planar coordination environment. The electrochemical behavior of 1-6 was investigated in detail, and the electronic structure of 1e-oxidized and 1e-reduced species was studied by electron paramagnetic resonance, UV-vis-near-IR spectroelectrochemistry, and density functional theory calculations indicating redox noninnocent behavior of the ligands. Compounds 1-6 were tested in the microwave-assisted solvent-free oxidation of cyclohexane by tert-butyl hydroperoxide to produce the industrially significant mixture of cyclohexanol and cyclohexanone (i.e., A/K oil). The results showed that the catalytic activity was affected by several factors, namely, reaction time and temperature or amount and type of catalyst. The best values for A/K oil yield (23%, turnover number of 1.1 × 102) were obtained with compound 6 after 2 h of microwave irradiation at 100 °C.
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Affiliation(s)
- Anatolie Dobrov
- Institute of Inorganic Chemistry , University of Vienna , Währinger Strasse 42 , A-1090 Vienna , Austria
| | - Denisa Darvasiová
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology , Slovak University of Technology in Bratislava , Radlinského 9 , SK-81237 Bratislava , Slovak Republic
| | - Michal Zalibera
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology , Slovak University of Technology in Bratislava , Radlinského 9 , SK-81237 Bratislava , Slovak Republic
| | - Lukáš Bučinský
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology , Slovak University of Technology in Bratislava , Radlinského 9 , SK-81237 Bratislava , Slovak Republic
| | - Ingrid Puškárová
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology , Slovak University of Technology in Bratislava , Radlinského 9 , SK-81237 Bratislava , Slovak Republic
| | - Peter Rapta
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology , Slovak University of Technology in Bratislava , Radlinského 9 , SK-81237 Bratislava , Slovak Republic
| | - Sergiu Shova
- Inorganic Polymers Department , "Petru Poni" Institute of Macromolecular Chemistry , Aleea Gr. Ghica Voda 41 A , 700487 Iasi , Romania
| | - Dan Dumitrescu
- Elettra-Sincrotrone Trieste S.C.p.A. , Strada Statale 14-km 163,5 in AREA Science Park , 34149 Basovizza, Trieste , Italy
| | - Luísa M D R S Martins
- Centro de Química Estrutural, Instituto Superior Técnico , Universidade de Lisboa , Av. Rovisco Pais , 1049-001 Lisboa , Portugal
| | - Armando J L Pombeiro
- Centro de Química Estrutural, Instituto Superior Técnico , Universidade de Lisboa , Av. Rovisco Pais , 1049-001 Lisboa , Portugal
| | - Vladimir B Arion
- Institute of Inorganic Chemistry , University of Vienna , Währinger Strasse 42 , A-1090 Vienna , Austria
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29
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Das K, Datta A, Massera C, Roma-Rodrigues C, Barroso M, Baptista PV, Fernandes AR. Structural aspects of a trimetallic CuII derivative: cytotoxicity and anti-proliferative activity on human cancer cell lines. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1597973] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Kuheli Das
- Institute of Chemistry, Academia Sinica, Nankang, Taipei, Taiwan
| | - Amitabha Datta
- Institute of Chemistry, Academia Sinica, Nankang, Taipei, Taiwan
| | - Chiara Massera
- Dipartimento di Chimica, Universita degli Studi di Parma, Parma, Italy
| | - Catarina Roma-Rodrigues
- UCIBO, DCV, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
| | - Mariana Barroso
- UCIBO, DCV, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
| | - Pedro V. Baptista
- UCIBO, DCV, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
| | - Alexandra R. Fernandes
- UCIBO, DCV, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
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30
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Arion VB. Coordination chemistry of S-substituted isothiosemicarbazides and isothiosemicarbazones. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.02.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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31
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Häßner M, Fiedler J, Ringenberg MR. (Spectro)electrochemical and Electrocatalytic Investigation of 1,1'-Dithiolatoferrocene-Hexacarbonyldiiron. Inorg Chem 2019; 58:1742-1745. [PMID: 30652870 DOI: 10.1021/acs.inorgchem.8b02971] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hexacarbonyldiiron bridged by a 1,1'-dithiolatoferrocene, [Fe(C5H4S)2{Fe(CO)3}2] (1), was synthesized, and the electrochemistry showed reversible oxidation at the Fe(C5H4S)2 site and quasi-reversible reduction at the hexacarbonyldiiron site. Spectroelectrochemical techniques showed reduction-induced ligand isomerization, where the thiolate ligand went from bridging to terminal and one carbon monoxide ligand moved to a quasi-bridging position; this mechanism was further supported by cyclic voltammetry simulation and density functional theory calculations. Complex 1 showed electrocatalytic activity toward hydrogen-evolving reaction.
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Affiliation(s)
- Manuel Häßner
- Institut für Anorganische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , 70550 Stuttgart , Germany
| | - Jan Fiedler
- J. Heyrovský Institute of Physical Chemistry , The Czech Academy of Sciences , Dolejškova 3 , 18223 Prague , Czech Republic
| | - Mark R Ringenberg
- Institut für Anorganische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , 70550 Stuttgart , Germany
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32
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Brazeau SEN, Norwine EE, Hannigan SF, Orth N, Ivanović-Burmazović I, Rukser D, Biebl F, Grimm-Lebsanft B, Praedel G, Teubner M, Rübhausen M, Liebhäuser P, Rösener T, Stanek J, Hoffmann A, Herres-Pawlis S, Doerrer LH. Dual oxidase/oxygenase reactivity and resonance Raman spectra of {Cu3O2} moiety with perfluoro-t-butoxide ligands. Dalton Trans 2019; 48:6899-6909. [DOI: 10.1039/c9dt00516a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A mechanism for the formation of O-donor trinuclear {Cu3O2} moiety is reported.
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Affiliation(s)
| | | | | | - Nicole Orth
- Department Chemie und Pharmazie
- Lehrstuhl für Bioanorganische Chemie
- Friedrich Alexander Universität Erlangen-Nürnberg
- 91058 Erlangen
- Germany
| | - Ivana Ivanović-Burmazović
- Department Chemie und Pharmazie
- Lehrstuhl für Bioanorganische Chemie
- Friedrich Alexander Universität Erlangen-Nürnberg
- 91058 Erlangen
- Germany
| | - Dieter Rukser
- Institut für Nanostruktur- und Festkörperphysik
- Universität Hamburg
- 22761 Hamburg
- Germany
| | - Florian Biebl
- Institut für Nanostruktur- und Festkörperphysik
- Universität Hamburg
- 22761 Hamburg
- Germany
| | | | - Gregor Praedel
- Institut für Nanostruktur- und Festkörperphysik
- Universität Hamburg
- 22761 Hamburg
- Germany
| | - Melissa Teubner
- Institut für Nanostruktur- und Festkörperphysik
- Universität Hamburg
- 22761 Hamburg
- Germany
| | - Michael Rübhausen
- Institut für Nanostruktur- und Festkörperphysik
- Universität Hamburg
- 22761 Hamburg
- Germany
| | | | - Thomas Rösener
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | - Julia Stanek
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
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33
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Baumgarth H, Meier G, von Hahmann CN, Braun T. Reactivity of rhodium and iridium peroxido complexes towards hydrogen in the presence of B(C 6F 5) 3 or [H(OEt 2) 2][B{3,5-(CF 3) 2C 6H 3} 4]. Dalton Trans 2018; 47:16299-16304. [PMID: 30403233 DOI: 10.1039/c8dt03853h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The peroxido complexes trans-[M(4-C5F4N)(O2)(CNtBu)(PR3)2] (1: M = Rh, R = Et; 2a: M = Ir, R = iPr) can be used in the metal-mediated hydrogenation of O2. The reaction of trans-[Rh(4-C5F4N)(O2)(CNtBu)(PEt3)2] (1) with B(C6F5)3 and H2 gave trans-[Rh(4-C5F4N)(CNtBu)(PEt3)2] (3), OPEt3 and (H2O)·B(C6F5)3, whereas treatment of [H(OEt2)2][B{3,5-(CF3)2C6H3}4] with 1 in the presence of H2 yielded trans-[Rh(4-C5F4N)(CNtBu)(PEt3)2] (3) and H2O2. The reactivity of 2a towards B(C6F5)3 and BClCy2 was also studied and an intermediate was detected which is assigned to be trans-[Ir(4-C5F4N)(Cl)(OOBCy2)(CNtBu)(PiPr3)2] (4a).
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Affiliation(s)
- Hanna Baumgarth
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Straße 2, D-12489 Berlin, Germany.
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34
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Rajabimoghadam K, Darwish Y, Bashir U, Pitman D, Eichelberger S, Siegler MA, Swart M, Garcia-Bosch I. Catalytic Aerobic Oxidation of Alcohols by Copper Complexes Bearing Redox-Active Ligands with Tunable H-Bonding Groups. J Am Chem Soc 2018; 140:16625-16634. [PMID: 30400740 DOI: 10.1021/jacs.8b08748] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In this research article, we describe the structure, spectroscopy, and reactivity of a family of copper complexes bearing bidentate redox-active ligands that contain H-bonding donor groups. Single-crystal X-ray crystallography shows that these tetracoordinate complexes are stabilized by intramolecular H-bonding interactions between the two ligand scaffolds. Interestingly, the Cu complexes undergo multiple reversible oxidation-reduction processes associated with the metal ion (CuI, CuII, CuIII) and/or the o-phenyldiamido ligand (L2-, L•-, L). Moreover, some of the CuII complexes catalyze the aerobic oxidation of alcohols to aldehydes (or ketones) at room temperature. Our extensive mechanistic analysis suggests that the dehydrogenation of alcohols occurs via an unusual reaction pathway for galactose oxidase model systems, in which O2 reduction occurs concurrently with substrate oxidation.
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Affiliation(s)
| | - Yousef Darwish
- Department of Chemistry , Southern Methodist University , Dallas , Texas 75275 , United States
| | - Umyeena Bashir
- Department of Chemistry , Southern Methodist University , Dallas , Texas 75275 , United States
| | - Dylan Pitman
- Department of Chemistry , Southern Methodist University , Dallas , Texas 75275 , United States
| | - Sidney Eichelberger
- Department of Chemistry , Southern Methodist University , Dallas , Texas 75275 , United States
| | - Maxime A Siegler
- Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Marcel Swart
- ICREA , Pg. Lluís Companys 23 , 08010 Barcelona , Spain.,IQCC , University of Girona , Campus Montilivi (Ciències) , Girona , Spain
| | - Isaac Garcia-Bosch
- Department of Chemistry , Southern Methodist University , Dallas , Texas 75275 , United States
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35
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Coordination chemistry of mononuclear ruthenium complexes bearing versatile 1,8-naphthyridine units: Utilization of specific reaction sites constructed by the secondary coordination sphere. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2017.11.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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36
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Eckshtain-Levi M, Lavi R, Arora H, Orio M, Benisvy L. Tuning the locus of oxidation in Cu-diamido-diphenoxo complexes: From Cu(III) to Cu(II)-phenoxyl radical. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.09.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Aggregation of mononuclear copper complexes by metal-oxidation-induced ligand deprotonation. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.08.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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39
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Paul GC, Das K, Maity S, Begum S, Srivastava HK, Mukherjee C. Geometry-Driven Iminosemiquinone Radical to Cu(II) Electron Transfer and Stabilization of an Elusive Five-Coordinate Cu(I) Complex: Synthesis, Characterization, and Reactivity with KO2. Inorg Chem 2018; 58:1782-1793. [DOI: 10.1021/acs.inorgchem.8b01931] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ganesh Chandra Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Kanu Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Suvendu Maity
- Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata 700103, India
| | - Samiyara Begum
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Hemant Kumar Srivastava
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Chandan Mukherjee
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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40
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Aerobic Oxidation of Alcohols Catalysed by Cu(I)/NMI/TEMPO System and Its Mechanistic Insights. Catal Letters 2018. [DOI: 10.1007/s10562-018-2485-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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41
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Sirois JJ, Padgitt-Cobb L, Gallegos MA, Beckman JS, Beaudry CM, Hurst JK. Oxidative Release of Copper from Pharmacologic Copper Bis(thiosemicarbazonato) Compounds. Inorg Chem 2018; 57:8923-8932. [DOI: 10.1021/acs.inorgchem.8b00853] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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42
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Das S, Sinha S, Jash U, Sikari R, Saha A, Barman SK, Brandão P, Paul ND. Redox-Induced Interconversion and Ligand-Centered Hemilability in NiII Complexes of Redox-Noninnocent Azo-Aromatic Pincers. Inorg Chem 2018; 57:5830-5841. [DOI: 10.1021/acs.inorgchem.8b00231] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Siuli Das
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, West Bengal, India
| | - Suman Sinha
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, West Bengal, India
| | - Upasona Jash
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, West Bengal, India
| | - Rina Sikari
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, West Bengal, India
| | - Anannya Saha
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
| | - Suman K. Barman
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
| | - Paula Brandão
- Departamento de Química, CICECO-Instituto de Materiais de Aveiro,Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - Nanda D. Paul
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, West Bengal, India
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43
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Jia X, Peng P, Cui J, Xin N, Huang X. Four N,O-Bidentate-Chelated Ligand-Tunable Copper(II) Complexes: Synthesis, Structural Characterization and Exceptional Catalytic Properties for Chan-Lam Coupling Reactions. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800153] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Xuefeng Jia
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemical and Material Science; Shanxi Normal University; Linfen, Shanxi Province 041004 China
| | - Pai Peng
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemical and Material Science; Shanxi Normal University; Linfen, Shanxi Province 041004 China
| | - Jing Cui
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemical and Material Science; Shanxi Normal University; Linfen, Shanxi Province 041004 China
| | - Nana Xin
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology; School of Chemistry & Chemical Engineering; Liaocheng University; Liaocheng Shandong Province 252059 China
| | - Xianqiang Huang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology; School of Chemistry & Chemical Engineering; Liaocheng University; Liaocheng Shandong Province 252059 China
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44
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Tanimoto R, Yamada K, Suzuki S, Kozaki M, Okada K. Group 11 Metal Complexes Coordinated by the (Nitronyl Nitroxide)-2-ide Radical Anion: Facile Oxidation of Stable Radicals Controlled by Metal-Carbon Bonds in Radical-Metalloids. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800038] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Ryu Tanimoto
- Graduate School of Science; Osaka City University; 558-8585 Osaka Osaka Prefecture Japan
| | - Kiyomi Yamada
- Graduate School of Science; Osaka City University; 558-8585 Osaka Osaka Prefecture Japan
| | - Shuichi Suzuki
- Graduate School of Science; Osaka City University; 558-8585 Osaka Osaka Prefecture Japan
| | - Masatoshi Kozaki
- Graduate School of Science; Osaka City University; 558-8585 Osaka Osaka Prefecture Japan
| | - Keiji Okada
- Graduate School of Science; Osaka City University; 558-8585 Osaka Osaka Prefecture Japan
- The Osaka City University Advanced Research Institute for Natural Science and Technology (OCARINA); 558-8585 Osaka Osaka Prefecture Japan
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45
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Mondal D, Majee MC, Kundu S, Mörtel M, Abbas G, Endo A, Khusniyarov MM, Chaudhury M. Dinuclear Iron(III) and Cobalt(III) Complexes Featuring a Biradical Bridge: Their Molecular Structures and Magnetic, Spectroscopic, and Redox Properties. Inorg Chem 2018; 57:1004-1016. [DOI: 10.1021/acs.inorgchem.7b02340] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dhrubajyoti Mondal
- Department of Inorganic
Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Mithun Chandra Majee
- Department of Inorganic
Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Sanchita Kundu
- Department of Inorganic
Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Max Mörtel
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstrasse
1, 91058 Erlangen, Germany
| | - Ghulam Abbas
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstrasse
1, 91058 Erlangen, Germany
| | - Akira Endo
- Department
of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1
Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
| | - Marat M. Khusniyarov
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstrasse
1, 91058 Erlangen, Germany
| | - Muktimoy Chaudhury
- Department of Inorganic
Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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46
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Characterization of the one-electron oxidized Cu(II)-salen complexes with a side chain aromatic ring: the effect of the indole ring on the Cu(II)-phenoxyl radical species. J Biol Inorg Chem 2017; 23:51-59. [PMID: 29218633 DOI: 10.1007/s00775-017-1508-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 11/09/2017] [Indexed: 10/18/2022]
Abstract
To gain insights into the role of the proximal indole ring in the redox-active metal center as seen in galactose oxidase, we prepared the Cu(II)-salen-type complexes having a pendent indol-3-ylmethyl (1), methyl (2) or benzyl (3) group substituted on the ethylenediamine moiety and investigated the structures and redox properties by various physicochemical methods and theoretical calculations. Neutral complexes 1, 2, and 3 showed no significant difference in the UV-Vis-NIR and EPR spectra. One-electron oxidation of 1, 2, and 3 by addition of 1 equiv. of thianthrenyl radical gave [1]SbCl 6 , [2]SbCl 6 , and [3]SbCl 6 , respectively, which could be assigned to relatively localized phenoxyl radical species. The cyclic and differential pulse voltammograms of [1]SbCl 6 showed two redox waves with a large separation between the first and second redox potentials compared with the separations observed for [2]SbCl 6 and [3]SbCl 6 . This suggests that [1]SbCl 6 is more stabilized than [2]SbCl 6 and [3]SbCl 6 . The NIR band of [1]SbCl 6 showed a larger blue shift than that of [2]SbCl 6 and [3]SbCl 6 . The EPR spectrum of [2]SbCl 6 exhibited an intense signal at the g value of 2 due to partial disproportionation to form the EPR active two-electron oxidized complex [2] 2+ , while the EPR intensity of [1]SbCl 6 was much weaker than that of [2]SbCl 6 . These results indicate that the pendent indole moiety stabilizes the Cu(II)-phenoxyl radical in [1]SbCl 6 most probably by stacking with the phenoxyl moiety, which is further supported by DFT calculations.
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47
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Wang D, Bruner CO. Catalytic Water Oxidation by a Bio-inspired Nickel Complex with a Redox-Active Ligand. Inorg Chem 2017; 56:13638-13641. [PMID: 29099176 PMCID: PMC5730068 DOI: 10.1021/acs.inorgchem.7b02166] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The oxidation of water (H2O) to dioxygen (O2) is important in natural photosynthesis. One of nature's strategies for managing such multi-electron transfer reactions is to employ redox-active metal-organic cofactor arrays. One prototype example is the copper tyrosinate active site found in galactose oxidase. In this work, we have implemented such a strategy to develop a bio-inspired nickel phenolate complex capable of catalyzing the oxidation of H2O to O2 electrochemically at neutral pH with a modest overpotential. Employment of the redox-active ligand turned out to be a useful strategy to avoid the formation of high-valent nickel intermediates while a reasonable turnover rate (0.15 s-1) is retained.
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Affiliation(s)
- Dong Wang
- Department of Chemistry and Biochemistry and Center for Biomolecular Structure and Dynamics, University of Montana , Missoula, Montana 59812, United States
| | - Charlie O Bruner
- Department of Chemistry and Biochemistry and Center for Biomolecular Structure and Dynamics, University of Montana , Missoula, Montana 59812, United States
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48
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Sinha S, Das S, Sikari R, Parua S, Brandaõ P, Demeshko S, Meyer F, Paul ND. Redox Noninnocent Azo-Aromatic Pincers and Their Iron Complexes. Isolation, Characterization, and Catalytic Alcohol Oxidation. Inorg Chem 2017; 56:14084-14100. [PMID: 29120616 DOI: 10.1021/acs.inorgchem.7b02238] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The new redox-noninnocent azoaromatic pincers 2-(arylazo)-1,10-phenanthroline (L1) and 2,9-bis(phenyldiazo)-1,10-phenanthroline (L2) are reported. The ligand L1 is a tridentate pincer having NNN donor atoms, whereas L2 is tetradentate having two azo-N donors and two N-donor atoms from the 1,10-phenanthroline moiety. Reaction of FeCl2 with L1 or L2 produced the pentacoordinated mixed-ligand Fe(II) complexes FeL1Cl2 (1) and FeL2Cl2 (2), respectively. Homoleptic octahedral Fe(II) complexes, mer-[Fe(L1)2](ClO4)2 [3](ClO4)2 and mer-[Fe(L2)2](ClO4)2 [4](ClO4)2, have been synthesized from the reaction of hydrated Fe(ClO4)2 and L1 or L2. The ligand L2, although having four donor sites available for coordination, binds the iron center in a tridentate fashion with one uncoordinated pendant azo function. Molecular and electronic structures of the isolated complexes have been scrutinized thoroughly by various spectroscopic techniques, single-crystal X-ray crystallography, and density functional theory. Beyond mere characterization, complexes 1 and 2 were successfully used as catalysts for the aerobic oxidation of primary and secondary benzylic alcohols. A wide variety of substituted benzyl alcohols were found to be converted to the corresponding carbonyl compounds in high yields, catalyzed by complex 1. Several control reactions were carried out to understand the mechanism of this alcohol oxidation reactions.
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Affiliation(s)
- Suman Sinha
- 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
| | - Rina Sikari
- Department of Chemistry, Indian Institute of Engineering Science and Technology , Shibpur, Botanic Garden, Howrah 711103, India
| | - Seuli Parua
- Department of Chemistry, Indian Institute of Engineering Science and Technology , Shibpur, Botanic Garden, Howrah 711103, India
| | - Paula Brandaõ
- Departamento de Química/CICECO, Universidade de Aveiro , 3810-193 Aveiro, Portugal
| | - Serhiy Demeshko
- Universität Göttingen , Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Universität Göttingen , Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Nanda D Paul
- Department of Chemistry, Indian Institute of Engineering Science and Technology , Shibpur, Botanic Garden, Howrah 711103, India
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49
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Wang L, Ye Y, Lykourinou V, Yang J, Angerhofer A, Zhao Y, Ming L. Catalytic Cooperativity, Nuclearity, and O
2
/H
2
O
2
Specificity of Multi‐Copper(II) Complexes of Cyclen‐Tethered Cyclotriphosphazene Ligands in Aqueous Media. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700811] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Le Wang
- College of Chemistry and Chemical Engineering Shanghai University of Engineering Science 201620 Shanghai People's Republic of China
- College of Chemistry and Molecular Engineering Zhengzhou University 450001 Zhengzhou People's Republic of China
- Department of Chemistry University of South Florida 33620‐5250 Tampa FL USA
| | - Yong Ye
- College of Chemistry and Molecular Engineering Zhengzhou University 450001 Zhengzhou People's Republic of China
| | | | - Junliang Yang
- College of Chemistry and Molecular Engineering Zhengzhou University 450001 Zhengzhou People's Republic of China
| | | | - Yufen Zhao
- College of Chemistry and Molecular Engineering Zhengzhou University 450001 Zhengzhou People's Republic of China
- Department of Chemical Biology Xiamen University 361005 Xiamen People's Republic of China
| | - Li‐June Ming
- Department of Chemistry University of South Florida 33620‐5250 Tampa FL USA
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50
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Matyuska F, Szorcsik A, May NV, Dancs Á, Kováts É, Bényei A, Gajda T. Tailoring the local environment around metal ions: a solution chemical and structural study of some multidentate tripodal ligands. Dalton Trans 2017. [PMID: 28650056 DOI: 10.1039/c7dt00104e] [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
Manganese(ii), copper(ii) and zinc(ii) complexes of four polydentate tripodal ligands (tachpyr (N,N',N''-tris(2-pyridylmethyl)-cis,cis-1,3,5-triaminocyclohexane), trenpyr (tris[2-(2-pyridylmethyl)aminoethyl]amine, tach3pyr (N,N',N''-tris(3-pyridylmethyl)-cis,cis-1,3,5-triaminocyclohexane) and tren3pyr (tris[2-(2-pyridylmethyl)aminoethyl]amine)) were characterized in both solution and solid states. A combined evaluation of potentiometric, UV-VIS, NMR and EPR data allowed the conclusion of both thermodynamic and structural information about the complexes formed in solution. The four tailored polydentate tripodal ligands studied here exhibit a high thermodynamic stability, and a variety of coordination environments/geometries for the studied transition metal ions. Our data indicate that tachpyr is a more efficient zinc(ii) chelator and a similar copper(ii) chelator compared to trenpyr. Considering the higher number of N-donors and conformational flexibility of trenpyr, as well as the energy demanding switch to the triaxial conformation required for metal ion binding of tachpyr, the above observation is surprising and is very likely due to the encapsulating effect of the more rigid tachpyr skeleton. This relative binding preference of tachpyr for zinc(ii) may be related to the observation that zinc(ii) is one of the principal metals targeted by tachpyr in cells. In contrast, trenpyr is a considerably more efficient manganese(ii) chelator, since it acts as a heptadentate ligand in the aqueous Mn(trenpyr) complex. The crystal structures of copper(ii) and zinc(ii) complexes of tachpyr indicated important differences in the ligand conformation, induced by the position of counter ions, as compared to earlier reports. The closely related new ligands, tach3pyr and tren3pyr, have been designed to form oligonuclear complexes. Indeed, we obtained a three dimensional polymer with a copper(ii)/tren3pyr ratio of 11/6. Within this metal-organic framework, three distinctly different copper geometries can be identified: square pyramidal, trigonal bipyramidal and tetrahedral. Two square pyramidal and four trigonal bipyramidal copper centres create a hexanuclear subunit with a large inside cavity. These moieties are linked by tetrahedral copper(ii) centres, constructing the three-dimensional polymer structure. The formation of such polynuclear complexes was not detected in solution. Both tach3pyr and tren3pyr form only mononuclear complexes with square pyramidal and trigonal bipyramidal geometries, respectively.
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Affiliation(s)
- Ferenc Matyuska
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
| | - Attila Szorcsik
- MTA-SZTE Bioinorganic Chemistry Research Group, Dóm tér 7, H-6720 Szeged, Hungary
| | - Nóra V May
- Research Centre for Natural Sciences HAS, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Ágnes Dancs
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
| | - Éva Kováts
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics HAS, Konkoly Thege Miklós u. 29-33, H-1121 Budapest, Hungary
| | - Attila Bényei
- Department of Pharmaceutical Chemistry, University of Debrecen, Egyetem tér 1, Debrecen H-4032, Hungary
| | - Tamás Gajda
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary. and MTA-SZTE Bioinorganic Chemistry Research Group, Dóm tér 7, H-6720 Szeged, Hungary
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