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Synthesis and structures of two mononuclear iron(ii) complexes derived from polypyridine ligands. MENDELEEV COMMUNICATIONS 2020. [DOI: 10.1016/j.mencom.2020.01.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Sánchez-Férez F, Bayés L, Font-Bardia M, Pons J. Solvent dependent formation of Cu(II) complexes based on isonicotinamide ligand. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.05.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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3
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Anandababu K, Ramasubramanian R, Wadepohl H, Comba P, Johnee Britto N, Jaccob M, Mayilmurugan R. A Structural and Functional Model for the Tris-Histidine Motif in Cysteine Dioxygenase. Chemistry 2019; 25:9540-9547. [PMID: 31090109 DOI: 10.1002/chem.201901005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 04/23/2019] [Indexed: 01/14/2023]
Abstract
The iron(II) complexes [Fe(L)(MeCN)3 ](SO3 CF3 )2 (L are two derivatives of tris(2-pyridyl)-based ligands) have been synthesized as models for cysteine dioxygenase (CDO). The molecular structure of one of the complexes exhibits octahedral coordination geometry and the Fe-Npy bond lengths [1.953(4)-1.972(4) Å] are similar to those in the Cys-bound FeII -CDO; Fe-NHis : 1.893-2.199 Å. The iron(II) centers of the model complexes exhibit relatively high FeIII/II redox potentials (E1/2 =0.988-1.380 V vs. ferrocene/ferrocenium electrode, Fc/Fc+ ), within the range for O2 activation and typical for the corresponding nonheme iron enzymes. The reaction of in situ generated [Fe(L)(MeCN)(SPh)]+ with excess O2 in acetonitrile (MeCN) yields selectively the doubly oxygenated phenylsulfinic acid product. Isotopic labeling studies using 18 O2 confirm the incorporation of both oxygen atoms of O2 into the product. Kinetic and preliminary DFT studies reveal the involvement of an FeIII peroxido intermediate with a rhombic S= 1 / 2 FeIII center (687-696 nm; g≈2.46-2.48, 2.13-2.15, 1.92-1.94), similar to the spectroscopic signature of the low-spin Cys-bound FeIII CDO (650 nm, g≈2.47, 2.29, 1.90). The proposed FeIII peroxido intermediates have been trapped, and the O-O stretching frequencies are in the expected range (approximately 920 and 820 cm-1 for the alkyl- and hydroperoxido species, respectively). The model complexes have a structure similar to that of the enzyme and structural aspects as well as the reactivity are discussed.
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Affiliation(s)
- Karunanithi Anandababu
- Bioinorganic Chemistry Laboratory/Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625021, India
| | - Ramamoorthy Ramasubramanian
- Bioinorganic Chemistry Laboratory/Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625021, India
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut and Interdisciplinary Center for Scientific Computing, Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Peter Comba
- Anorganisch-Chemisches Institut and Interdisciplinary Center for Scientific Computing, Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | | | - Madhavan Jaccob
- Department of Chemistry, Loyola College, Chennai, 600034, India
| | - Ramasamy Mayilmurugan
- Bioinorganic Chemistry Laboratory/Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625021, India
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Li YY, Ye K, Siegbahn PEM, Liao RZ. Mechanism of Water Oxidation Catalyzed by a Mononuclear Manganese Complex. CHEMSUSCHEM 2017; 10:903-911. [PMID: 27925413 DOI: 10.1002/cssc.201601538] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 12/01/2016] [Indexed: 06/06/2023]
Abstract
The design and synthesis of biomimetic Mn complexes to catalyze oxygen evolution is a very appealing goal because water oxidation in nature employs a Mn complex. Recently, the mononuclear Mn complex [LMnII (H2 O)2 ]2+ [1, L=Py2 N(tBu)2 , Py=pyridyl] was reported to catalyze water oxidation electrochemically at an applied potential of 1.23 V at pH 12.2 in aqueous solution. Density functional calculations were performed to elucidate the mechanism of water oxidation promoted by this catalyst. The calculations showed that 1 can lose two protons and one electron readily to produce [LMnIII (OH)2 ]+ (2), which then undergoes two sequential proton-coupled electron-transfer processes to afford [LMnV OO]+ (4). The O-O bond formation can occur through direct coupling of the two oxido ligands or through nucleophilic attack of water. These two mechanisms have similar barriers of approximately 17 kcal mol-1 . The further oxidation of 4 to generate [LMnVI OO]2+ (5), which enables O-O bond formation, has a much higher barrier. In addition, ligand degradation by C-H activation has a similar barrier to that for the O-O bond formation, and this explains the relatively low turnover number of this catalyst.
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Affiliation(s)
- Ying-Ying Li
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Ke Ye
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Per E M Siegbahn
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691, Stockholm, Sweden
| | - Rong-Zhen Liao
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
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Kärkäs MD, Åkermark B. Water oxidation using earth-abundant transition metal catalysts: opportunities and challenges. Dalton Trans 2016; 45:14421-61. [DOI: 10.1039/c6dt00809g] [Citation(s) in RCA: 181] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Catalysts for the oxidation of water are a vital component of solar energy to fuel conversion technologies. This Perspective summarizes recent advances in the field of designing homogeneous water oxidation catalysts (WOCs) based on Mn, Fe, Co and Cu.
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Affiliation(s)
- Markus D. Kärkäs
- Department of Organic Chemistry
- Arrhenius Laboratory
- Stockholm University
- SE-106 91 Stockholm
- Sweden
| | - Björn Åkermark
- Department of Organic Chemistry
- Arrhenius Laboratory
- Stockholm University
- SE-106 91 Stockholm
- Sweden
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Bikas R, Aleshkevych P, Hosseini-Monfared H, Sanchiz J, Szymczak R, Lis T. Synthesis, structure, magnetic properties and EPR spectroscopy of a copper(ii) coordination polymer with a ditopic hydrazone ligand and acetate bridges. Dalton Trans 2015; 44:1782-9. [DOI: 10.1039/c4dt03060e] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis, structure, EPR spectroscopy and magnetic properties of a 1D coordination polymer of Cu(ii) containing two kinds of acetate bridged dimers is reported.
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Affiliation(s)
- Rahman Bikas
- Department of Chemistry
- Faculty of Science
- University of Zanjan
- Zanjan
- Iran
| | - Pavlo Aleshkevych
- Institute of Physics
- Polish Academy of Sciences (PAN)
- PL-02-668 Warsaw
- Poland
| | | | - Joaquín Sanchiz
- Department of Chemistry
- Faculty of Science
- University of La Laguna
- Tenerife 38206
- Spain
| | - Ritta Szymczak
- Institute of Physics
- Polish Academy of Sciences (PAN)
- PL-02-668 Warsaw
- Poland
| | - Tadeusz Lis
- Faculty of Chemistry
- University of Wroclaw
- Wroclaw 50-383
- Poland
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Santoro A, Sambiagio C, McGowan PC, Halcrow MA. Synthesis and coordination chemistry of 1,1,1-tris-(pyrid-2-yl)ethane. Dalton Trans 2015; 44:1060-9. [DOI: 10.1039/c4dt02824d] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The complexes [ML2]n+(Mn+= Fe2+, Co2+, Co3+, Cu2+and Ag+), [PdCl2L] and [CuI(L)] are described. [AgL2]+is an unusual square planar silver(i) centre (left). Exposure of [CuI(L)] to air affords mono- or dinuclear copper(ii)/carbonato products. Two of the copper complexes form crystalline hydrates with complicated hydrogen bond networks (right).
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Mechanism for O-O bond formation in a biomimetic tetranuclear manganese cluster--A density functional theory study. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 152:162-72. [PMID: 25534173 DOI: 10.1016/j.jphotobiol.2014.12.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 11/25/2014] [Accepted: 12/01/2014] [Indexed: 11/21/2022]
Abstract
Density functional theory calculations have been used to study the reaction mechanism of water oxidation catalyzed by a tetranuclear Mn-oxo cluster Mn4O4L6 (L=(C6H4)2PO4(-)). It is proposed that the O-O bond formation mechanism is different in the gas phase and in a water solution. In the gas phase, upon phosphate ligand dissociation triggered by light absorption, the O-O bond formation starting with both the Mn4(III,III,IV,IV) and Mn4(III,IV,IV,IV) oxidation states has to take place via direct coupling of two bridging oxo groups. The calculated barriers are 42.3 and 37.1 kcal/mol, respectively, and there is an endergonicity of more than 10 kcal/mol. Additional photons are needed to overcome these large barriers. In water solution, water binding to the two vacant sites of the Mn ions, again after phosphate dissociation triggered by light absorption, is thermodynamically and kinetically very favorable. The catalytic cycle is suggested to start from the Mn4(III,III,III,IV) oxidation state. The removal of three electrons and three protons leads to the formation of a Mn4(III,IV,IV,IV)-oxyl radical complex. The O-O bond formation then proceeds via a nucleophilic attack of water on the Mn(IV)-oxyl radical assisted by a Mn-bound hydroxide that abstracts a proton during the attack. This step was calculated to be rate-limiting with a total barrier of 29.2 kcal/mol. This is followed by proton-coupled electron transfer, O2 release, and water binding to start the next catalytic cycle.
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Kärkäs MD, Verho O, Johnston EV, Åkermark B. Artificial Photosynthesis: Molecular Systems for Catalytic Water Oxidation. Chem Rev 2014; 114:11863-2001. [DOI: 10.1021/cr400572f] [Citation(s) in RCA: 1024] [Impact Index Per Article: 102.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Markus D. Kärkäs
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Oscar Verho
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Eric V. Johnston
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Björn Åkermark
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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Ahn SH, Shin JW, Moon D. Crystal structure of bis(1,3-bis{[(1 H-pyrrol-2-yl)methylidene]amino-κ N}propan-2-olato-κ O)manganese(III) nitrate methanol monosolvate. Acta Crystallogr Sect E Struct Rep Online 2014; 70:210-2. [PMID: 25484654 PMCID: PMC4257179 DOI: 10.1107/s1600536814020406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 09/11/2014] [Indexed: 11/11/2022]
Abstract
The MnIII ion in the title compound shows a slightly distorted octahedral coordination geometry with two O and four N atoms of the pyrrolyl derivative ligand. In the crystal, intermolecular N—H⋯O hydrogen bonds between the pyrrole group of the ligand and the uncoordinated nitrate ion give a chain structure along [10]. The asymmetric unit of the title compound, [Mn(C13H15N4O)2]NO3·CH3OH, contains two independent complex cations, in each of which the MnIII ion is located on an inversion centre. The MnIII ion is coordinated by four N and two O atoms from two 1,3-bis{[(1H-pyrrol-2-yl)methylidene]amino}propan-2-olate ligands, resulting in a distorted octahedral geometry. The average Mn—ligand bond lengths in the two complex molecules are 2.074 and 2.079 Å. In the crystal, intermolecular N—H⋯O hydrogen bonds between the pyrrole group of the ligand and the non-coordinating nitrate ion give rise to a chain structure along [10-1]. The methanol solvent molecule and the nitrate ion are connected by an O—H⋯O hydrogen bond.
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11
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Glyoxylate as a reducing agent for manganese(III) in salen scaffold: A kinetics and mechanistic study. J CHEM SCI 2014. [DOI: 10.1007/s12039-014-0605-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Hirahara M, Shoji A, Yagi M. Artificial Manganese Center Models for Photosynthetic Oxygen Evolution in Photosystem II. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300683] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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13
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Westphal A, Klinkebiel A, Berends HM, Broda H, Kurz P, Tuczek F. Electronic Structure and Spectroscopic Properties of Mononuclear Manganese(III) Schiff Base Complexes: A Systematic Study on [Mn(acen)X] Complexes by EPR, UV/vis, and MCD Spectroscopy (X = Hal, NCS). Inorg Chem 2013; 52:2372-87. [DOI: 10.1021/ic301889e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Anne Westphal
- Institut
für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, D-24118 Kiel, Germany
| | - Arne Klinkebiel
- Institut
für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, D-24118 Kiel, Germany
| | - Hans-Martin Berends
- Institut
für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, D-24118 Kiel, Germany
| | - Henning Broda
- Institut
für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, D-24118 Kiel, Germany
| | - Philipp Kurz
- Institut
für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, D-24118 Kiel, Germany
| | - Felix Tuczek
- Institut
für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, D-24118 Kiel, Germany
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