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Sýs M, Kocábová J, Klikarová J, Novák M, Jirásko R, Obluková M, Mikysek T, Sokolová R. Comparison of mononuclear and dinuclear copper(II) biomimetic complexes: spectroelectrochemical mechanistic study of their catalytic pathways. Dalton Trans 2022; 51:13703-13715. [PMID: 36001067 DOI: 10.1039/d2dt01610a] [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
Two catecholase-like biomimetic catalysts, namely, two dinuclear copper complexes [Cu2(L1)(OH)(H2O)(EtOH)][ClO4]2 (C1) and [Cu2Ac2O(L1)ClO4] (C2) with the 2,6-bis(4-methyl piperazin-1-yl-methyl)-4-formyl-phenoxy ligand (L1) together with the mononuclear complex Cu(ClO4)2(L2) (C3) containing ligand 1,2-(C5H4N-6-OCH3-2-CHN)2CH2CH2 (L2), were synthesized. Their catalytic pathways were investigated and compared. The evaluation of the catalytic activity of compound C1 (and C2, C3) using the Michaelis-Menten model was represented by values of KM = 272.93 (223.02; 1616) μmol L-1 and Vmax of 0.981 (1.617; 1.689) μmol L-1 s-1. The role of water content in the solvent is also discussed. The dinuclear complexes C1 and C2 were found to be more efficient catalysts than mononuclear complex C3. The mode of catalytic action was characterized via cyclic voltammetry, spectrophotometry, and UV-Vis spectroelectrochemistry. The catalytic mechanism of 3,5-di-tert butyl catechol oxidation in the presence of oxygen was proposed. The reaction circle was proved by the confirmation of the chemical reversibility of complex reduction. The advantage of the in situ spectroelectrochemical measurement enabled to control the reduction of quinone formed by the chemical reaction of catechol with oxygen in solution. At this step, the simultaneous change in the absorption spectrum indicated a change in the copper redox state of the catalyst.
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Affiliation(s)
- Milan Sýs
- Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic.
| | - Jana Kocábová
- J. Heyrovský Institute of Physical Chemistry of the CAS, Dolejškova 3, 182 23 Prague 8, Czech Republic.
| | - Jitka Klikarová
- Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic.
| | - Miroslav Novák
- Institute of Chemistry and Technology of Macromolecular Materials, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 53210, Pardubice, Czech Republic
| | - Robert Jirásko
- Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic.
| | - Michaela Obluková
- J. Heyrovský Institute of Physical Chemistry of the CAS, Dolejškova 3, 182 23 Prague 8, Czech Republic.
| | - Tomáš Mikysek
- Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic.
| | - Romana Sokolová
- J. Heyrovský Institute of Physical Chemistry of the CAS, Dolejškova 3, 182 23 Prague 8, Czech Republic.
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2
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Stańczak A, Chalupský J, Rulíšek L, Straka M. Comprehensive Theoretical View of the [Cu2O2] Side-on-Peroxo-/Bis-μ-Oxo Equilibria. Chemphyschem 2022; 23:e202200076. [PMID: 35532185 DOI: 10.1002/cphc.202200076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/20/2022] [Indexed: 11/07/2022]
Abstract
Coupled binuclear copper (CBC) sites are employed by many metalloenzymes to catalyze a broad set of biochemical transformations. Typically, the CBC catalytic sites are activated by the O2 molecule to form various [Cu2O2] reactive species. This has also inspired synthesis and development of various biomimetic inorganic complexes featuring the CBC core. From theoretical perspective, the [Cu2O2] reactivity often hinges on the side-on-peroxo-dicopper(II) (P) vs. bis-μ-oxo-dicopper(III) (O) isomerism - an equilibrium that has become almost iconic in theoretical bioinorganic chemistry. Herein, we present a comprehensive calibration and evaluation of the performance of various composite computational protocols available in contemporary computational chemistry, involving coupled-cluster and multi-reference (relativistic) wave function methods, popular density functionals and solvation models. Starting with the well-studied reference [Cu2O2(NH3)6]2+ system, we compared the performance of electronic structure methods and discussed the relativistic effects. This allowed us to select several 'calibrated' DFT functionals that can be conveniently employed to study ten experimentally well-characterized [Cu2O2] inorganic systems. We mostly correctly predicted the lowest-energy structures (P vs. O) of the studied systems. In addition, we present calibration of the used electronic structure methods for prediction of the spectroscopic features of the [Cu2O2] core.
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Affiliation(s)
- Agnieszka Stańczak
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences: Ustav organicke chemie a biochemie Akademie ved Ceske republiky, Bioinorganic Chemistry, CZECH REPUBLIC
| | - Jakub Chalupský
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences: Ustav organicke chemie a biochemie Akademie ved Ceske republiky, Bioinorganic Chemistry, CZECH REPUBLIC
| | - Lubomír Rulíšek
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences: Ustav organicke chemie a biochemie Akademie ved Ceske republiky, Bioinorganic Chemistry, CZECH REPUBLIC
| | - Michal Straka
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences: Ustav organicke chemie a biochemie Akademie ved Ceske republiky, Bioinorganic Chemistry, Flemingovo nam. 2, 16610, Prague, CZECH REPUBLIC
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3
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Paul M, Teubner M, Grimm-Lebsanft B, Buchenau S, Hoffmann A, Rübhausen M, Herres-Pawlis S. Influence of the amine donor on hybrid guanidine-stabilized Bis(μ-oxido) dicopper(III) complexes and their tyrosinase-like oxygenation activity towards polycyclic aromatic alcohols. J Inorg Biochem 2021; 224:111541. [PMID: 34416481 DOI: 10.1016/j.jinorgbio.2021.111541] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 06/30/2021] [Accepted: 07/11/2021] [Indexed: 10/20/2022]
Abstract
The tyrosinase-like activity of hybrid guanidine-stabilized bis(μ-oxido) dicopper(III) complexes [Cu2(μ-O)2(L)2](X)2 (L = 2-{2-((Diethylamino)methyl)phenyl}-1,1,3,3-tetramethylguanidine (TMGbenzNEt2, L2) and 2-{2-((Di-isopropylamino)methyl)phenyl}-1,1,3,3-tetramethylguanidine (TMGbenzNiPr2, L3); X = PF6-, BF4-, CF3SO3-) is described. New aromatic hybrid guanidine amine ligands were developed with varying amine donor function. Their copper(I) complexes were analyzed towards their ability to activate dioxygen in the presence of different weakly coordinating anions. The resulting bis(μ-oxido) species were characterized at low temperatures by UV/Vis and resonance Raman spectroscopy, cryo-ESI mass spectrometry and density functional theory calculations. Small structural changes in the ligand sphere were found to influence the characteristic ligand-to-metal charge transfer (LMCT) features of the bis(μ-oxido) species, correlating a redshift in the UV/Vis spectrum with weaker N-donor function of the ligand. DFT calculations elucidated the influence of the steric and electronic properties of the bis(μ-oxido) species leading to a higher twist of the Cu2O2 plane against the CuN2 plane and a stretching of the Cu2O2 core. Despite their moderate stability at -100 °C, the bis(μ-oxido) complexes exhibited a remarkable activity in catalytic oxygenation reactions of polycyclic aromatic alcohols. Further the selectivity of the catalyst in the hydroxylation reactions of challenging phenolic substrates is not changed despite an increasing shield of the reactive bis(μ-oxido) core. The generated quinones were found to form exclusively bent phenazines, providing a promising strategy to access tailored phenazine derivatives.
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Affiliation(s)
- Melanie Paul
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
| | - Melissa Teubner
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany; Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | | | - Sören Buchenau
- Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany.
| | - Michael Rübhausen
- Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany.
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4
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Paul M, Hoffmann A, Herres-Pawlis S. Room temperature stable multitalent: highly reactive and versatile copper guanidine complexes in oxygenation reactions. J Biol Inorg Chem 2021; 26:249-263. [PMID: 33595752 PMCID: PMC8068697 DOI: 10.1007/s00775-021-01849-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 01/20/2021] [Indexed: 12/24/2022]
Abstract
Inspired by the efficiency of natural enzymes in organic transformation reactions, the development of synthetic catalysts for oxygenation and oxidation reactions under mild conditions still remains challenging. Tyrosinases serve as archetype when it comes to hydroxylation reactions involving molecular oxygen. We herein present new copper(I) guanidine halide complexes, capable of the activation of molecular oxygen at room temperature. The formation of the reactive bis(µ-oxido) dicopper(III) species and the influence of the anion are investigated by UV/Vis spectroscopy, mass spectrometry, and density functional theory. We highlight the catalytic hydroxylation activity towards diverse polycyclic aromatic alcohols under mild reaction conditions. The selective formation of reactive quinones provides a promising tool to design phenazine derivatives for medical applications.
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Affiliation(s)
- Melanie Paul
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany.
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5
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Kröckert KW, Mannsperger JS, Rösener T, Hoffmann A, Herres‐Pawlis S. Increasing the Activity of Copper Guanidine Quinoline Catalysts: Substitution at the Quinoline Backbone Leads to Highly Active Complexes for ATRP. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202000461] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | | | - Thomas Rösener
- Institute of Inorganic Chemistry RWTH Aachen University Landoltweg 1A 52074 Aachen
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry RWTH Aachen University Landoltweg 1A 52074 Aachen
| | - Sonja Herres‐Pawlis
- Institute of Inorganic Chemistry RWTH Aachen University Landoltweg 1A 52074 Aachen
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6
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Paul M, Teubner M, Grimm‐Lebsanft B, Golchert C, Meiners Y, Senft L, Keisers K, Liebhäuser P, Rösener T, Biebl F, Buchenau S, Naumova M, Murzin V, Krug R, Hoffmann A, Pietruszka J, Ivanović‐Burmazović I, Rübhausen M, Herres‐Pawlis S. Exceptional Substrate Diversity in Oxygenation Reactions Catalyzed by a Bis(μ-oxo) Copper Complex. Chemistry 2020; 26:7556-7562. [PMID: 32104930 PMCID: PMC7317579 DOI: 10.1002/chem.202000664] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 02/26/2020] [Indexed: 12/18/2022]
Abstract
The enzyme tyrosinase contains a reactive side-on peroxo dicopper(II) center as catalytically active species in C-H oxygenation reactions. The tyrosinase activity of the isomeric bis(μ-oxo) dicopper(III) form has been discussed controversially. The synthesis of bis(μ-oxo) dicopper(III) species [Cu2 (μ-O)2 (L1)2 ](X)2 ([O1](X)2 , X=PF6 - , BF4 - , OTf- , ClO4 - ), stabilized by the new hybrid guanidine ligand 2-{2-((dimethylamino)methyl)phenyl}-1,1,3,3-tetramethylguanidine (L1), and its characterization by UV/Vis, Raman, and XAS spectroscopy, as well as cryo-UHR-ESI mass spectrometry, is described. We highlight selective oxygenation of a plethora of phenolic substrates mediated by [O1](PF6 )2 , which results in mono- and bicyclic quinones and provides an attractive strategy for designing new phenazines. The selectivity is predicted by using the Fukui function, which is hereby introduced into tyrosinase model chemistry. Our bioinspired catalysis harnesses molecular dioxygen for organic transformations and achieves a substrate diversity reaching far beyond the scope of the enzyme.
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Affiliation(s)
- Melanie Paul
- Department of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Melissa Teubner
- Department of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
- Department of PhysicsUniversity of HamburgLuruper Chaussee 14922761HamburgGermany
| | | | - Christiane Golchert
- Department of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Yannick Meiners
- Department of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Laura Senft
- Department of Chemistry and PharmacyFriedrich-Alexander-University of Erlangen-NürnbergEgerlandstrasse 191058ErlangenGermany
| | - Kristina Keisers
- Department of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Patricia Liebhäuser
- Department of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Thomas Rösener
- Department of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Florian Biebl
- Department of PhysicsUniversity of HamburgLuruper Chaussee 14922761HamburgGermany
| | - Sören Buchenau
- Department of PhysicsUniversity of HamburgLuruper Chaussee 14922761HamburgGermany
| | - Maria Naumova
- Deutsches Elektronen-Synchrotron DESYNotkestrasse 8522607HamburgGermany
| | - Vadim Murzin
- Deutsches Elektronen-Synchrotron DESYNotkestrasse 8522607HamburgGermany
| | - Roxanne Krug
- Institute of Bioorganic ChemistryHeinrich Heine University Düsseldorf at Forschungszentrum Jülich52425JülichGermany
| | - Alexander Hoffmann
- Department of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Jörg Pietruszka
- Institute of Bioorganic ChemistryHeinrich Heine University Düsseldorf at Forschungszentrum Jülich52425JülichGermany
- Institute of Bio- and Geoscience (IBG-1: Biotechnology)Forschungszentrum Jülich GmbH52425JülichGermany
| | - Ivana Ivanović‐Burmazović
- Department of Chemistry and PharmacyFriedrich-Alexander-University of Erlangen-NürnbergEgerlandstrasse 191058ErlangenGermany
| | - Michael Rübhausen
- Department of PhysicsUniversity of HamburgLuruper Chaussee 14922761HamburgGermany
| | - Sonja Herres‐Pawlis
- Department of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
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7
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Cui XY, Tan CH, Leow D. Metal-catalysed reactions enabled by guanidine-type ligands. Org Biomol Chem 2019; 17:4689-4699. [DOI: 10.1039/c8ob02240b] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A review of metal–guanidine complexes, which are selective and powerful catalysts for organic transformations, asymmetric synthesis, and polymerisation.
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Affiliation(s)
- Xi-Yang Cui
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
| | - Choon-Hong Tan
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
| | - Dasheng Leow
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
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8
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Stanek J, Konrad M, Mannsperger J, Hoffmann A, Herres-Pawlis S. Influence of Functionalized Substituents on the Electron-Transfer Abilities of Copper Guanidinoquinoline Complexes. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201801078] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Julia Stanek
- Institute for Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Marc Konrad
- Institute for Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Johannes Mannsperger
- Institute for Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Alexander Hoffmann
- Institute for Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Sonja Herres-Pawlis
- Institute for Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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9
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Abstract
Bis(guanidine) copper complexes are known for their ability to activate dioxygen. Unfortunately, until now, no bis(guanidine) copper-dioxygen adduct has been able to transfer oxygen to substrates. Using an aromatic backbone, fluorescence properties can be added to the copper(I) complex which renders them useful for later reaction monitoring. The novel bis(guanidine) ligand DMEG2tol stabilizes copper(I) and copper(II) complexes (characterized by single crystal X-ray diffraction, IR spectroscopy, and mass spectrometry) and, after oxygen activation, bis(µ-oxido) dicopper(III) complexes which have been characterized by low-temperature UV/Vis and Raman spectroscopy. These bis(guanidine) stabilized bis(µ-oxido) complexes are able to mediate tyrosinase-like hydroxylation activity as first examples of bis(guanidine) stabilized complexes. The experimental study is accompanied by density functional theory calculations which highlight the special role of the different guanidine donors.
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10
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Grimm-Lebsanft B, Brett C, Strassl F, Rukser D, Biednov M, Biebl F, Naumova M, Hoffmann A, Akinsinde L, Brückner D, Herres-Pawlis S, Rübhausen M. A cryostat for low temperature resonance Raman measurements on operando oxygenated bioinorganic model complexes. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.07.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Benders S, Strassl F, Fenger B, Blümich B, Herres-Pawlis S, Küppers M. Imaging of copper oxygenation reactions in a bubble flow. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:826-830. [PMID: 29682795 DOI: 10.1002/mrc.4742] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 04/04/2018] [Indexed: 06/08/2023]
Abstract
Reactions of gases with liquids play a crucial role in the production of many bulk chemicals. Often, the gas is bubbled into the chosen reactor. Most of the processes at the gas-liquid interface of the bubbles and in their tails are not fully understood and warrant further investigation. For this purpose, NMR imaging or Magnetic Resonance Imaging has been applied to visualize some of the processes in the bubble tail. To generate sufficient contrast, a magnetogenic gas-liquid reaction associated with a change of magnetic state, from diamagnetic to paramagnetic, was employed. In this work, a copper(I)-based compound was oxidized to copper(II) to exploit relaxation contrast. To match the speed of the rising bubbles to the acquisition time of the spin-echo imaging sequence, polyethylene glycol was added to increase the viscosity of the reacting solution. Images of the oxygen ingress into a static solution as well as of oxygen bubbles rising in the solution are presented. In both cases, changes in magnetism were observed, which reported the hydrodynamic processes.
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Affiliation(s)
- Stefan Benders
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Aachen, 52074, Germany
| | - Florian Strassl
- Institut für Anorganische Chemie, RWTH Aachen University, Aachen, 52074, Germany
| | - Bastian Fenger
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Aachen, 52074, Germany
| | - Bernhard Blümich
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Aachen, 52074, Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie, RWTH Aachen University, Aachen, 52074, Germany
| | - Markus Küppers
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Aachen, 52074, Germany
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12
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Rösener T, Hoffmann A, Herres-Pawlis S. Next Generation of Guanidine Quinoline Copper Complexes for Highly Controlled ATRP: Influence of Backbone Substitution on Redox Chemistry and Solubility. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800511] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Thomas Rösener
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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13
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Metz A, McKeown P, Esser B, Gohlke C, Kröckert K, Laurini L, Scheckenbach M, McCormick SN, Oswald M, Hoffmann A, Jones MD, Herres-Pawlis S. ZnII
Chlorido Complexes with Aliphatic, Chiral Bisguanidine Ligands as Catalysts in the Ring-Opening Polymerisation of rac
-Lactide Using FT-IR Spectroscopy in Bulk. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201701147] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Angela Metz
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Paul McKeown
- Centre for Sustainable Chemical Technologies; Department of Chemistry; University of Bath; Claverton Down BA2 7AY Bath United Kingdom
| | - Bastian Esser
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Clara Gohlke
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Konstantin Kröckert
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Larissa Laurini
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Michael Scheckenbach
- Department of Chemistry and Pharmacy; Ludwig-Maximlians University Munich; Butenandtstraße 5-13 81377 Munich Germany
| | - Strachan N. McCormick
- Centre for Sustainable Chemical Technologies; Department of Chemistry; University of Bath; Claverton Down BA2 7AY Bath United Kingdom
| | - Michaela Oswald
- Department of Chemistry and Pharmacy; Ludwig-Maximlians University Munich; Butenandtstraße 5-13 81377 Munich Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Matthew D. Jones
- Centre for Sustainable Chemical Technologies; Department of Chemistry; University of Bath; Claverton Down BA2 7AY Bath United Kingdom
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
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14
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Liebhäuser P, Keisers K, Hoffmann A, Schnappinger T, Sommer I, Thoma A, Wilfer C, Schoch R, Stührenberg K, Bauer M, Dürr M, Ivanović-Burmazović I, Herres-Pawlis S. Record Broken: A Copper Peroxide Complex with Enhanced Stability and Faster Hydroxylation Catalysis. Chemistry 2017; 23:12171-12183. [PMID: 28425134 DOI: 10.1002/chem.201700887] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Indexed: 11/08/2022]
Abstract
Tyrosinase model systems pinpoint pathways to translating Nature's synthetic abilities for useful synthetic catalysts. Mostly, they use N-donor ligands which mimic the histidine residues coordinating the two copper centres. Copper complexes with bis(pyrazolyl)methanes with pyridinyl or imidazolyl moieties are already reported as excellent tyrosinase models. Substitution of the pyridinyl donor results in the new ligand HC(3-tBuPz)2 (4-CO2 MePy) which stabilises a room-temperature stable μ-η2 :η2 -peroxide dicopper(II) species upon oxygenation. It reveals highly efficient catalytic activity as it hydroxylates 8-hydroxyquinoline in high yields (TONs of up to 20) and much faster than all other model systems (max. conversion within 7.5 min). Stoichiometric reactions with para-substituted sodium phenolates show saturation kinetics which are nearly linear for electron-rich substrates. The resulting Hammett correlation proves the electrophilic aromatic substitution mechanism. Furthermore, density functional theory (DFT) calculations elucidate the influence of the substituent at the pyridinyl donor: the carboxymethyl group adjusts the basicity and nucleophilicity without additional steric demand. This substitution opens up new pathways in reactivity tuning.
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Affiliation(s)
- Patricia Liebhäuser
- Institut für Anorganische Chemie, Rheinisch-Westfälische Technische Hochschule Aachen, Landoltweg 1, 52074, Aachen, Germany
| | - Kristina Keisers
- Institut für Anorganische Chemie, Rheinisch-Westfälische Technische Hochschule Aachen, Landoltweg 1, 52074, Aachen, Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie, Rheinisch-Westfälische Technische Hochschule Aachen, Landoltweg 1, 52074, Aachen, Germany
| | - Thomas Schnappinger
- Department für Chemie und Pharmazie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377, München, Germany
| | - Isabella Sommer
- Institut für Anorganische Chemie, Rheinisch-Westfälische Technische Hochschule Aachen, Landoltweg 1, 52074, Aachen, Germany
| | - Anne Thoma
- Institut für Anorganische Chemie, Rheinisch-Westfälische Technische Hochschule Aachen, Landoltweg 1, 52074, Aachen, Germany
| | - Claudia Wilfer
- Institut für Anorganische Chemie, Rheinisch-Westfälische Technische Hochschule Aachen, Landoltweg 1, 52074, Aachen, Germany
| | - Roland Schoch
- Department Chemie, Universität Paderborn, Warburger Straße 100, 33098, Paderborn, Germany
| | - Kai Stührenberg
- Department Chemie, Universität Paderborn, Warburger Straße 100, 33098, Paderborn, Germany
| | - Matthias Bauer
- Department Chemie, Universität Paderborn, Warburger Straße 100, 33098, Paderborn, Germany
| | - Maximilian Dürr
- Department Chemie und Pharmazie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
| | - Ivana Ivanović-Burmazović
- Department Chemie und Pharmazie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie, Rheinisch-Westfälische Technische Hochschule Aachen, Landoltweg 1, 52074, Aachen, Germany
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15
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Oppermann A, Laurini L, Etscheidt F, Hollmann K, Strassl F, Hoffmann A, Schurr D, Dittmeyer R, Rinke G, Herres-Pawlis S. Detection of Copper Bisguanidine NO Adducts by UV-vis Spectroscopy and a SuperFocus Mixer. Chem Eng Technol 2017. [DOI: 10.1002/ceat.201600691] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Alexander Oppermann
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
| | - Larissa Laurini
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
| | - Fabian Etscheidt
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
| | - Katharina Hollmann
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
| | - Florian Strassl
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
| | - Alexander Hoffmann
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
| | - Daniela Schurr
- Karlsruhe Institute of Technology; Institute for Micro Process Engineering; Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Roland Dittmeyer
- Karlsruhe Institute of Technology; Institute for Micro Process Engineering; Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Günter Rinke
- Karlsruhe Institute of Technology; Institute for Micro Process Engineering; Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Sonja Herres-Pawlis
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
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16
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Shimizu I, Morimoto Y, Faltermeier D, Kerscher M, Paria S, Abe T, Sugimoto H, Fujieda N, Asano K, Suzuki T, Comba P, Itoh S. Tetrahedral Copper(II) Complexes with a Labile Coordination Site Supported by a Tris-tetramethylguanidinato Ligand. Inorg Chem 2017; 56:9634-9645. [DOI: 10.1021/acs.inorgchem.7b01154] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Ikuma Shimizu
- Department of Material
and Life Science, Division of Advanced Science and Biotechnology,
Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Yuma Morimoto
- Department of Material
and Life Science, Division of Advanced Science and Biotechnology,
Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Dieter Faltermeier
- Anorganisch-Chemisches Institut and Interdisciplinary
Center for Scientific Computing, Universität Heidelberg, INF 270, 69120 Heidelberg, Germany
| | - Marion Kerscher
- Anorganisch-Chemisches Institut and Interdisciplinary
Center for Scientific Computing, Universität Heidelberg, INF 270, 69120 Heidelberg, Germany
| | - Sayantan Paria
- Department of Material
and Life Science, Division of Advanced Science and Biotechnology,
Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Tsukasa Abe
- Department of Material
and Life Science, Division of Advanced Science and Biotechnology,
Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Hideki Sugimoto
- Department of Material
and Life Science, Division of Advanced Science and Biotechnology,
Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Nobutaka Fujieda
- Department of Material
and Life Science, Division of Advanced Science and Biotechnology,
Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Kaori Asano
- Comprehensive Analysis Center, The Institute of Scientific
and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0057, Japan
| | - Takeyuki Suzuki
- Comprehensive Analysis Center, The Institute of Scientific
and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0057, Japan
| | - Peter Comba
- Anorganisch-Chemisches Institut and Interdisciplinary
Center for Scientific Computing, Universität Heidelberg, INF 270, 69120 Heidelberg, Germany
| | - Shinobu Itoh
- Department of Material
and Life Science, Division of Advanced Science and Biotechnology,
Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
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17
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Strassl F, Grimm-Lebsanft B, Rukser D, Biebl F, Biednov M, Brett C, Timmermann R, Metz F, Hoffmann A, Rübhausen M, Herres-Pawlis S. Oxygen Activation by Copper Complexes with an Aromatic Bis(guanidine) Ligand. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700528] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Florian Strassl
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Benjamin Grimm-Lebsanft
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Dieter Rukser
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Florian Biebl
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Mykola Biednov
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Calvin Brett
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Riccardo Timmermann
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Fabian Metz
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Michael Rübhausen
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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18
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Gupta P, Diefenbach M, Holthausen MC, Förster M. Copper-Mediated Selective Hydroxylation of a Non-activated C−H Bond in Steroids: A DFT Study of Schönecker's Reaction. Chemistry 2016; 23:1427-1435. [DOI: 10.1002/chem.201604829] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Puneet Gupta
- Institut für Anorganische und Analytische Chemie; Johann Wolfgang Goethe-Universität Frankfurt; Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
- Present address: Max-Planck-Institut für Kohlenforschung; Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Martin Diefenbach
- Institut für Anorganische und Analytische Chemie; Johann Wolfgang Goethe-Universität Frankfurt; Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
| | - Max C. Holthausen
- Institut für Anorganische und Analytische Chemie; Johann Wolfgang Goethe-Universität Frankfurt; Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
| | - Moritz Förster
- Institut für Anorganische und Analytische Chemie; Johann Wolfgang Goethe-Universität Frankfurt; Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
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19
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High-valent copper in biomimetic and biological oxidations. J Biol Inorg Chem 2016; 22:289-305. [PMID: 27909921 DOI: 10.1007/s00775-016-1420-5] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 11/17/2016] [Indexed: 10/20/2022]
Abstract
A long-standing debate in the Cu-O2 field has revolved around the relevance of the Cu(III) oxidation state in biological redox processes. The proposal of Cu(III) in biology is generally challenged as no spectroscopic or structural evidence exists currently for its presence. The reaction of synthetic Cu(I) complexes with O2 at low temperature in aprotic solvents provides the opportunity to investigate and define the chemical landscape of Cu-O2 species at a small-molecule level of detail; eight different types are characterized structurally, three of which contain at least one Cu(III) center. Simple imidazole or histamine ligands are competent in these oxygenation reactions to form Cu(III) complexes. The combination of synthetic structural and reactivity data suggests (1) that Cu(I) should be considered as either a one or two electron reductant reacting with O2, (2) that Cu(III) reduction potentials of these formed complexes are modest and well within the limits of a protein matrix and (3) that primary amine and imidazole ligands are surprisingly good at stabilizing Cu(III) centers. These Cu(III) complexes are efficient oxidants for hydroxylating phenolate substrates with reaction hallmarks similar to that performed in biological systems. The remarkable ligation similarity of the synthetic and biological systems makes it difficult to continue to exclude Cu(III) from biological discussions.
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20
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Metz A, Plothe R, Glowacki B, Koszalkowski A, Scheckenbach M, Beringer A, Rösener T, Michaelis de Vasconcellos J, Haase R, Flörke U, Hoffmann A, Herres-Pawlis S. Zinc Chloride Complexes with Aliphatic and Aromatic Guanidine Hybrid Ligands and Their Activity in the Ring-Opening Polymerisation ofd,l-Lactide. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600870] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Angela Metz
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Ramona Plothe
- Technische Universität Dortmund; Fakultät Chemie und Chemische Biologie; Otto-Hahn-Str. 6 44227 Dortmund Germany
| | - Britta Glowacki
- Technische Universität Dortmund; Fakultät Chemie und Chemische Biologie; Otto-Hahn-Str. 6 44227 Dortmund Germany
| | - Andreas Koszalkowski
- Ludwig-Maximilians-Universität München; Department of Chemistry; Butenandtstr. 5-13 81377 München Germany
| | - Michael Scheckenbach
- Ludwig-Maximilians-Universität München; Department of Chemistry; Butenandtstr. 5-13 81377 München Germany
| | - Andreas Beringer
- Ludwig-Maximilians-Universität München; Department of Chemistry; Butenandtstr. 5-13 81377 München Germany
| | - Thomas Rösener
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | | | - Roxana Haase
- Universität Paderborn, Anorganische Chemie; Department Chemie; Warburger Str. 100 33098 Paderborn Germany
| | - Ulrich Flörke
- Universität Paderborn, Anorganische Chemie; Department Chemie; Warburger Str. 100 33098 Paderborn Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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21
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Hoffmann A, Wern M, Hoppe T, Witte M, Haase R, Liebhäuser P, Glatthaar J, Herres-Pawlis S, Schindler S. Hand in Hand: Experimental and Theoretical Investigations into the Reactions of Copper(I) Mono- and Bis(guanidine) Complexes with Dioxygen. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600906] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alexander Hoffmann
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Miriam Wern
- Institut für Anorganische und Analytische Chemie; Justus-Liebig-Universität Gießen; Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Tobias Hoppe
- Institut für Anorganische und Analytische Chemie; Justus-Liebig-Universität Gießen; Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Matthias Witte
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Roxana Haase
- Department Chemie; Universität Paderborn; Warburger Str. 100 33098 Paderborn Germany
| | - Patricia Liebhäuser
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Jörg Glatthaar
- Institut für Organische Chemie; Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Siegfried Schindler
- Institut für Anorganische und Analytische Chemie; Justus-Liebig-Universität Gießen; Heinrich-Buff-Ring 17 35392 Gießen Germany
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22
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Hoffmann A, Stanek J, Dicke B, Peters L, Grimm-Lebsanft B, Wetzel A, Jesser A, Bauer M, Gnida M, Meyer-Klaucke W, Rübhausen M, Herres-Pawlis S. Implications of Guanidine Substitution on Copper Complexes as Entatic-State Models. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600655] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alexander Hoffmann
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Julia Stanek
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Benjamin Dicke
- Universität Hamburg; Institut für Nanostruktur- und Festkörperphysik and Center for Free-Electron Laser Science; Notkestrasse 85 22607 Hamburg Germany
| | - Laurens Peters
- Department Chemie; Ludwig-Maximilians Universität München; Butenandtstraße 5-13 81377 München Germany
| | - Benjamin Grimm-Lebsanft
- Universität Hamburg; Institut für Nanostruktur- und Festkörperphysik and Center for Free-Electron Laser Science; Notkestrasse 85 22607 Hamburg Germany
| | - Alina Wetzel
- Universität Hamburg; Institut für Nanostruktur- und Festkörperphysik and Center for Free-Electron Laser Science; Notkestrasse 85 22607 Hamburg Germany
| | - Anton Jesser
- Department Chemie; Ludwig-Maximilians Universität München; Butenandtstraße 5-13 81377 München Germany
| | - Matthias Bauer
- Universität Paderborn; Department Chemie; Warburger Str. 100 33098 Paderborn Germany
| | - Manuel Gnida
- Universität Paderborn; Department Chemie; Warburger Str. 100 33098 Paderborn Germany
| | - Wolfram Meyer-Klaucke
- Universität Paderborn; Department Chemie; Warburger Str. 100 33098 Paderborn Germany
| | - Michael Rübhausen
- Universität Hamburg; Institut für Nanostruktur- und Festkörperphysik and Center for Free-Electron Laser Science; Notkestrasse 85 22607 Hamburg Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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23
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Rösener T, Bienemann O, Sigl K, Schopp N, Schnitter F, Flörke U, Hoffmann A, Döring A, Kuckling D, Herres-Pawlis S. A Comprehensive Study of Copper Guanidine Quinoline Complexes: Predicting the Activity of Catalysts in ATRP with DFT. Chemistry 2016; 22:13550-62. [PMID: 27505859 DOI: 10.1002/chem.201602223] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Indexed: 11/07/2022]
Abstract
Copper complexes of the hybrid guanidine ligands 1,3-dimethyl-N-(quinolin-8-yl)-imidazolidin-2-imine (DMEGqu) and 1,1,3,3-tetramethyl-2-(quinolin-8-yl)-guanidine (TMGqu) have been studied comprehensively with regard to their structural and electrochemical properties and their activity in atom transfer radical polymerization (ATRP). A simple analysis of the molecular structures of the complexes gives no indication about their activity in ATRP; however, with the help of DFT and NBO analysis the influence of particular coordinating donors on the electrochemical properties could be fully elucidated. With an adequate DFT methodology and newly applied theoretical isodesmic reactions it was possible to predict the relative position of the redox potentials of copper complexes containing DMEGqu and TMGqu ligands. In addition, predictions could be made as to whether the complexes of DMEGqu or TMGqu are more active in ATRP. Four new Cu(I) complexes were tested in standard ATRP reactions and kinetically investigated both in bulk and in solution. It could be proven that complexes featuring DMEGqu possess a lower redox potential and are more active in ATRP, although the tetramethylguanidine moiety represents the stronger donor.
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Affiliation(s)
- Thomas Rösener
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Olga Bienemann
- Technische Universität Dortmund, Fakultät CCB, Otto-Hahn-Str. 6, 44277, Dortmund, Germany
| | - Kerstin Sigl
- Department für Chemie und Pharmazie, Ludwig-Maximilians Universität München, Butenandtstraße 5-13, 81377, München, Germany
| | - Nora Schopp
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Fabian Schnitter
- Department für Chemie und Pharmazie, Ludwig-Maximilians Universität München, Butenandtstraße 5-13, 81377, München, Germany
| | - Ulrich Flörke
- Department Chemie, Universität Paderborn, Warburger Str.100, 33098, Paderborn, Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Artjom Döring
- Department Chemie, Universität Paderborn, Warburger Str.100, 33098, Paderborn, Germany
| | - Dirk Kuckling
- Department Chemie, Universität Paderborn, Warburger Str.100, 33098, Paderborn, Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany.
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24
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Engelmann X, Monte-Pérez I, Ray K. Oxidationsreaktionen mit bioinspirierten einkernigen Nicht-Häm-Oxidometallkomplexen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600507] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xenia Engelmann
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Inés Monte-Pérez
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Kallol Ray
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
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25
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Engelmann X, Monte-Pérez I, Ray K. Oxidation Reactions with Bioinspired Mononuclear Non-Heme Metal-Oxo Complexes. Angew Chem Int Ed Engl 2016; 55:7632-49. [DOI: 10.1002/anie.201600507] [Citation(s) in RCA: 207] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Revised: 03/15/2016] [Indexed: 12/22/2022]
Affiliation(s)
- Xenia Engelmann
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Inés Monte-Pérez
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Kallol Ray
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Strasse 2 12489 Berlin Germany
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26
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Schurr D, Strassl F, Liebhäuser P, Rinke G, Dittmeyer R, Herres-Pawlis S. Decay kinetics of sensitive bioinorganic species in a SuperFocus mixer at ambient conditions. REACT CHEM ENG 2016. [DOI: 10.1039/c6re00119j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
For the first time the formation and decay of the thermally very sensitive bis(μ-oxo)dicopper species was monitored at ambient temperature in a continuous flow setup and the rate constant of the decay was measured.
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Affiliation(s)
- Daniela Schurr
- Institute for Micro Process Engineering
- Karlsruhe Institute of Technology
- 76344 Eggenstein-Leopoldshafen
- Germany
| | - Florian Strassl
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | | | - Günter Rinke
- Institute for Micro Process Engineering
- Karlsruhe Institute of Technology
- 76344 Eggenstein-Leopoldshafen
- Germany
| | - Roland Dittmeyer
- Institute for Micro Process Engineering
- Karlsruhe Institute of Technology
- 76344 Eggenstein-Leopoldshafen
- Germany
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