1
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Johnston HM, Freire DM, Mantsorov C, Jamison N, Green KN. Manganese (III/IV) μ‐oxo Dimers and (III) Monomers with Tetra‐aza Macrocyclic Ligands and Historically Relevant Open‐Chain Ligands. Eur J Inorg Chem 2022; 2022. [DOI: 10.1002/ejic.202200039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - David M. Freire
- Texas Christian University Chemistry & Biochemistry UNITED STATES
| | | | - Nena Jamison
- Texas Christian University Chemistry & Biochemistry UNITED STATES
| | - Kayla N. Green
- Texas Christian University Department of Chemistry 2950 W. BowieTCU BOX 298860 76129 Fort Worth UNITED STATES
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2
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Bigness A, Vaddypally S, Zdilla MJ, Mendoza-Cortes JL. Ubiquity of cubanes in bioinorganic relevant compounds. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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3
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Huang Z, Guan R, Shanmugam M, Bennett EL, Robertson CM, Brookfield A, McInnes EJL, Xiao J. Oxidative Cleavage of Alkenes by O 2 with a Non-Heme Manganese Catalyst. J Am Chem Soc 2021; 143:10005-10013. [PMID: 34160220 PMCID: PMC8297864 DOI: 10.1021/jacs.1c05757] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
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The oxidative cleavage
of C=C double bonds with molecular
oxygen to produce carbonyl compounds is an important transformation
in chemical and pharmaceutical synthesis. In nature, enzymes containing
the first-row transition metals, particularly heme and non-heme iron-dependent
enzymes, readily activate O2 and oxidatively cleave C=C
bonds with exquisite precision under ambient conditions. The reaction
remains challenging for synthetic chemists, however. There are only
a small number of known synthetic metal catalysts that allow for the
oxidative cleavage of alkenes at an atmospheric pressure of O2, with very few known to catalyze the cleavage of nonactivated
alkenes. In this work, we describe a light-driven, Mn-catalyzed protocol
for the selective oxidation of alkenes to carbonyls under 1 atm of
O2. For the first time, aromatic as well as various nonactivated
aliphatic alkenes could be oxidized to afford ketones and aldehydes
under clean, mild conditions with a first row, biorelevant metal catalyst.
Moreover, the protocol shows a very good functional group tolerance.
Mechanistic investigation suggests that Mn–oxo species, including
an asymmetric, mixed-valent bis(μ-oxo)-Mn(III,IV) complex, are
involved in the oxidation, and the solvent methanol participates in
O2 activation that leads to the formation of the oxo species.
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Affiliation(s)
- Zhiliang Huang
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, U.K
| | - Renpeng Guan
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, U.K
| | - Muralidharan Shanmugam
- Department of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, U.K
| | - Elliot L Bennett
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, U.K
| | - Craig M Robertson
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, U.K
| | - Adam Brookfield
- Department of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, U.K
| | - Eric J L McInnes
- Department of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, U.K
| | - Jianliang Xiao
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, U.K
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4
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Babu R, Bhargavi G, Rajasekharan MV. Polybromides of Transition Metal Chelates – Synthesis, Structure and Spectral Properties. ChemistrySelect 2021. [DOI: 10.1002/slct.202004395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ramavath Babu
- School of Chemistry University of Hyderabad Hyderabad 500 046, TS India
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5
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Putting the Squeeze on Molecule-Based Magnets: Exploiting Pressure to Develop Magneto-Structural Correlations in Paramagnetic Coordination Compounds. MAGNETOCHEMISTRY 2020. [DOI: 10.3390/magnetochemistry6030032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The cornerstone of molecular magnetism is a detailed understanding of the relationship between structure and magnetic behaviour, i.e., the development of magneto-structural correlations. Traditionally, the synthetic chemist approaches this challenge by making multiple compounds that share a similar magnetic core but differ in peripheral ligation. Changes in the ligand framework induce changes in the bond angles and distances around the metal ions, which are manifested in changes to magnetic susceptibility and magnetisation data. This approach requires the synthesis of a series of different ligands and assumes that the chemical/electronic nature of the ligands and their coordination to the metal, the nature and number of counter ions and how they are positioned in the crystal lattice, and the molecular and crystallographic symmetry have no effect on the measured magnetic properties. In short, the assumption is that everything outwith the magnetic core is inconsequential, which is a huge oversimplification. The ideal scenario would be to have the same complex available in multiple structural conformations, and this is something that can be achieved through the application of external hydrostatic pressure, correlating structural changes observed through high-pressure single crystal X-ray crystallography with changes observed in high-pressure magnetometry, in tandem with high-pressure inelastic neutron scattering (INS), high-pressure electron paramagnetic resonance (EPR) spectroscopy, and high-pressure absorption/emission/Raman spectroscopy. In this review, which summarises our work in this area over the last 15 years, we show that the application of pressure to molecule-based magnets can (reversibly) (1) lead to changes in bond angles, distances, and Jahn–Teller orientations; (2) break and form bonds; (3) induce polymerisation/depolymerisation; (4) enforce multiple phase transitions; (5) instigate piezochromism; (6) change the magnitude and sign of pairwise exchange interactions and magnetic anisotropy, and (7) lead to significant increases in magnetic ordering temperatures.
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6
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Lee Y, Jackson TA. Ligand Influence on Structural Properties and Reactivity of Bis(μ-oxo)dimanganese(III,IV) Species and Comparison of Reactivity with Terminal MnIV
-oxo Complexes. ChemistrySelect 2018. [DOI: 10.1002/slct.201803668] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yuri Lee
- Department of Chemistry; The University of Kansas, 1567; Irving Hill Road Lawrence KS 66045 USA
| | - Timothy A. Jackson
- Department of Chemistry; The University of Kansas, 1567; Irving Hill Road Lawrence KS 66045 USA
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7
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Kılıç Y, Kani İ. Selective catalytic oxidation of alkenes employing homobinuclear manganese(II) catalysts with TBHP. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.12.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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Su E, Guven A, Kani I. Oxygen bridged Homobinuclear Mn(II) compounds with Anthranilic acid: Theoretical calculations, oxidation and catalase activity. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.4105] [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)
- Esra Su
- Department of ChemistryFaculty of Science & Letters, Istanbul Technical University Maslak, 34469 Istanbul Turkey
- Department of Chemistry, Faculty of ScienceAnadolu University 26470 Eskisehir Turkey
| | - Alaettin Guven
- Department of Chemistry, Faculty of ScienceAnadolu University 26470 Eskisehir Turkey
| | - Ibrahim Kani
- Department of Chemistry, Faculty of ScienceAnadolu University 26470 Eskisehir Turkey
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9
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Rapatskiy L, Ames WM, Pérez-Navarro M, Savitsky A, Griese JJ, Weyhermüller T, Shafaat HS, Högbom M, Neese F, Pantazis DA, Cox N. Characterization of Oxygen Bridged Manganese Model Complexes Using Multifrequency 17O-Hyperfine EPR Spectroscopies and Density Functional Theory. J Phys Chem B 2015. [DOI: 10.1021/acs.jpcb.5b04614] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Leonid Rapatskiy
- Max-Planck Institute for Chemical Energy, Stiftstr. 34-36, Mülheim an der Ruhr, DE-45470 Germany
| | - William M. Ames
- Max-Planck Institute for Chemical Energy, Stiftstr. 34-36, Mülheim an der Ruhr, DE-45470 Germany
| | - Montserrat Pérez-Navarro
- Max-Planck Institute for Chemical Energy, Stiftstr. 34-36, Mülheim an der Ruhr, DE-45470 Germany
| | - Anton Savitsky
- Max-Planck Institute for Chemical Energy, Stiftstr. 34-36, Mülheim an der Ruhr, DE-45470 Germany
| | - Julia J. Griese
- Department
of Biochemistry and Biophysics, Stockholm University, Stockholm SE-106 91, Sweden
| | - Thomas Weyhermüller
- Max-Planck Institute for Chemical Energy, Stiftstr. 34-36, Mülheim an der Ruhr, DE-45470 Germany
| | - Hannah S. Shafaat
- Max-Planck Institute for Chemical Energy, Stiftstr. 34-36, Mülheim an der Ruhr, DE-45470 Germany
| | - Martin Högbom
- Department
of Biochemistry and Biophysics, Stockholm University, Stockholm SE-106 91, Sweden
| | - Frank Neese
- Max-Planck Institute for Chemical Energy, Stiftstr. 34-36, Mülheim an der Ruhr, DE-45470 Germany
| | - Dimitrios A. Pantazis
- Max-Planck Institute for Chemical Energy, Stiftstr. 34-36, Mülheim an der Ruhr, DE-45470 Germany
| | - Nicholas Cox
- Max-Planck Institute for Chemical Energy, Stiftstr. 34-36, Mülheim an der Ruhr, DE-45470 Germany
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10
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Tsui EY, Kanady JS, Agapie T. Synthetic cluster models of biological and heterogeneous manganese catalysts for O2 evolution. Inorg Chem 2014; 52:13833-48. [PMID: 24328344 DOI: 10.1021/ic402236f] [Citation(s) in RCA: 120] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Artificial photosynthesis has emerged as an important strategy toward clean and renewable fuels. Catalytic oxidation of water to O2 remains a significant challenge in this context. A mechanistic understanding of currently known heterogeneous and biological catalysts at a molecular level is highly desirable for fundamental reasons as well as for the rational design of practical catalysts. This Award Article discusses recent efforts in synthesizing structural models of the oxygen-evolving complex of photosystem II. These structural motifs are also related to heterogeneous mixed-metal oxide catalysts. A stepwise synthetic methodology was developed toward achieving the structural complexity of the targeted active sites. A geometrically restricted multinucleating ligand, but with labile coordination modes, was employed for the synthesis of low-oxidation-state trimetallic species. These precursors were elaborated to site-differentiated tetrametallic complexes in high oxidation states. This methodology has allowed for structure-reactivity studies that have offered insight into the effects of different components of the clusters. Mechanistic aspects of oxygen-atom transfer and incorporation from water have been interrogated. Significantly, a large and systematic effect of redox-inactive metals on the redox properties of these clusters was discovered. With the pKa value of the redox-inactive metal-aqua complex as a measure of the Lewis acidity, structurally analogous clusters display a linear dependence between the reduction potential and acidity; each pKa unit shifts the potential by ca. 90 mV. Implications for the function of the biological and heterogeneous catalysts are discussed.
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Affiliation(s)
- Emily Y Tsui
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
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11
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Lampropoulos C, Thuijs AE, Mitchell KJ, Abboud KA, Christou G. Manganese/Cerium Clusters Spanning a Range of Oxidation Levels and CeMn8, Ce2Mn4, and Ce6Mn4 Nuclearities: Structural, Magnetic, and EPR Properties. Inorg Chem 2014; 53:6805-16. [DOI: 10.1021/ic500617f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christos Lampropoulos
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Annaliese E. Thuijs
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Kylie J. Mitchell
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Khalil A. Abboud
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - George Christou
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
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12
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Yano J, Yachandra V. Mn4Ca cluster in photosynthesis: where and how water is oxidized to dioxygen. Chem Rev 2014; 114:4175-205. [PMID: 24684576 PMCID: PMC4002066 DOI: 10.1021/cr4004874] [Citation(s) in RCA: 464] [Impact Index Per Article: 46.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Indexed: 12/25/2022]
Affiliation(s)
- Junko Yano
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Vittal Yachandra
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
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13
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14
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Fischer S, Schmidt J, Strauch P, Thomas A. An Anionic Microporous Polymer Network Prepared by the Polymerization of Weakly Coordinating Anions. Angew Chem Int Ed Engl 2013; 52:12174-8. [DOI: 10.1002/anie.201303045] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 08/02/2013] [Indexed: 11/11/2022]
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15
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Fischer S, Schmidt J, Strauch P, Thomas A. Anionische, mikroporöse Polymernetzwerke durch Polymerisation eines schwach koordinierenden Anions. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303045] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Blasco S, Cano J, Clares MP, García-Granda S, Doménech A, Jiménez HR, Verdejo B, Lloret F, García-España E. A Binuclear MnIII Complex of a Scorpiand-Like Ligand Displaying a Single Unsupported MnIII–O–MnIII Bridge. Inorg Chem 2012; 51:11698-706. [DOI: 10.1021/ic3016063] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Salvador Blasco
- Instituto de Ciencia Molecular,
Departamento de Química Inorgánica, Universidad de Valencia,
C/Catedrático José Beltrán Martínez, 2,
46980, Paterna, Valencia, Spain
| | - Joan Cano
- Instituto de Ciencia Molecular,
Departamento de Química Inorgánica, Universidad de Valencia,
C/Catedrático José Beltrán Martínez, 2,
46980, Paterna, Valencia, Spain
- Fundació General de la
Universitat de València (FGUV), Universitat de València,
E-46980 Paterna, València, Spain
| | - M. Paz Clares
- Instituto de Ciencia Molecular,
Departamento de Química Inorgánica, Universidad de Valencia,
C/Catedrático José Beltrán Martínez, 2,
46980, Paterna, Valencia, Spain
| | - Santiago García-Granda
- Departamento de Química
Física y Analítica, Universidad de Oviedo, C/Julián
Clavería, 8, 33006, Oviedo, Spain
| | - Antonio Doménech
- Departamento de Química
Analítica, Universidad de Valencia, C/Dr. Moliner 50, 46100,
Burjassot, Valencia, Spain
| | - Hermas R. Jiménez
- Departamento de Química
Inorgánica, Universidad de Valencia, C/Dr. Moliner 50, 46100,
Burjassot, Valencia, Spain
| | - Begoña Verdejo
- Instituto de Ciencia Molecular,
Departamento de Química Inorgánica, Universidad de Valencia,
C/Catedrático José Beltrán Martínez, 2,
46980, Paterna, Valencia, Spain
| | - Francesc Lloret
- Instituto de Ciencia Molecular,
Departamento de Química Inorgánica, Universidad de Valencia,
C/Catedrático José Beltrán Martínez, 2,
46980, Paterna, Valencia, Spain
| | - Enrique García-España
- Instituto de Ciencia Molecular,
Departamento de Química Inorgánica, Universidad de Valencia,
C/Catedrático José Beltrán Martínez, 2,
46980, Paterna, Valencia, Spain
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17
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Rapatskiy L, Cox N, Savitsky A, Ames WM, Sander J, Nowaczyk MM, Rögner M, Boussac A, Neese F, Messinger J, Lubitz W. Detection of the Water-Binding Sites of the Oxygen-Evolving Complex of Photosystem II Using W-Band 17O Electron–Electron Double Resonance-Detected NMR Spectroscopy. J Am Chem Soc 2012; 134:16619-34. [DOI: 10.1021/ja3053267] [Citation(s) in RCA: 224] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Leonid Rapatskiy
- Max-Planck-Institut für
Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Nicholas Cox
- Max-Planck-Institut für
Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Anton Savitsky
- Max-Planck-Institut für
Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - William M. Ames
- Max-Planck-Institut für
Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Julia Sander
- Plant
Biochemistry, Ruhr University Bochum, Universitätsstrasse
150, D-44780 Bochum, Germany
| | - Marc. M. Nowaczyk
- Plant
Biochemistry, Ruhr University Bochum, Universitätsstrasse
150, D-44780 Bochum, Germany
| | - Matthias Rögner
- Plant
Biochemistry, Ruhr University Bochum, Universitätsstrasse
150, D-44780 Bochum, Germany
| | - Alain Boussac
- iBiTec-S, URA UMR 8221, CEA Saclay,
91191 Gif-sur-Yvette, France
| | - Frank Neese
- Max-Planck-Institut für
Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Johannes Messinger
- Department of Chemistry, Chemical
Biological Centre (KBC), Umeå University, S-90187 Umeå, Sweden
| | - Wolfgang Lubitz
- Max-Planck-Institut für
Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
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18
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Viciano-Chumillas M, Giménez-Marqués M, Tanase S, Mutikainen I, Turpeinen U, Smits JMM, de Gelder R, Jos de Jongh L, Reedijk J. Mononuclear and dinuclear manganese compounds stabilized by supramolecular interactions. Dalton Trans 2012; 41:10249-57. [PMID: 22790017 DOI: 10.1039/c2dt31060k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New manganese compounds [Mn(HphpzMe)(2)(H(2)phpzMe)(HCO(2))] (1), [Mn(2)(phpzMe)(2)(HphpzMe)(2)(OCH(3))]·2CH(3)OH (2), Na{[Mn(HphpzPh)(phpzPh)(MeOH)(2)](2)}(HCO(2)) (3), [Mn(HphpzPh)(2)(EtOH)(2)]ClO(4)·2EtOH (4) and [Mn(HphpzPh)(2)N(3)] (5) were synthesized and characterized with various techniques. 1, 4 and 5 are mononuclear manganese(III) compounds, 2 is a mixed-valence dinuclear manganese(III/IV) compound, and 3 is a trinuclear compound containing two manganese(III) ions and a sodium(I) ion. A remarkable feature is the spontaneous formation of the formate ion as a result of the methanol or methoxide oxidation in compounds 1 and 3. Using ethanol precludes the formation of the formate and compound 4 is obtained. The molecular structure of all compounds is stabilized by supramolecular interactions, including strong hydrogen bonding and π-π interactions.
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Affiliation(s)
- Marta Viciano-Chumillas
- Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, Leiden, The Netherlands
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19
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Gómez V, Corbella M, Mautner FA, Roubeau O, Teat SJ, Font-Bardia M, Calvet T. Manganese compounds with phthalate and terephthalate ligands: Synthesis, crystal structure, magnetic properties and catalase activity. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.07.036] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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20
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Yamazaki H, Igarashi S, Nagata T, Yagi M. Substituent Effects on Core Structures and Heterogeneous Catalytic Activities of MnIII(μ-O)2MnIV Dimers with 2,2′:6′,2″-Terpyridine Derivative Ligands for Water Oxidation. Inorg Chem 2012; 51:1530-9. [DOI: 10.1021/ic201797h] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hirosato Yamazaki
- Department of Materials
Science
and Technology, Faculty of Engineering and Center for Transdisciplinary
Research, Niigata University, 8050 Ikarashi-2,
Niigata 950-2181, Japan
| | - Satoshi Igarashi
- Faculty of Education, Niigata University, 8050 Ikarashi-2, Niigata 950-2181,
Japan
| | - Toshi Nagata
- Institute for Molecular Science, Myodaiji, Okazaki 444-8787, Japan
| | - Masayuki Yagi
- Department of Materials
Science
and Technology, Faculty of Engineering and Center for Transdisciplinary
Research, Niigata University, 8050 Ikarashi-2,
Niigata 950-2181, Japan
- PRESTO (Precursory Research
for Embryonic Science and Technology), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi,
Saitama 332-0012, Japan
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21
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Wang T, Brudvig GW, Batista VS. Study of Proton Coupled Electron Transfer in a Biomimetic Dimanganese Water Oxidation Catalyst with Terminal Water Ligands. J Chem Theory Comput 2010; 6:2395-2401. [PMID: 20827389 DOI: 10.1021/ct1002658] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The oxomanganese complex [H(2)O(terpy)Mn(III)(μ-O)(2)Mn(IV)(terpy)H(2)O](3+) (1, terpy = 2,2':6-2″-terpyridine) is a biomimetic model of the oxygen evolving complex of photosystem II with terminal water ligands. When bound to TiO(2) surfaces, 1 is activated by primary oxidants (e.g., Ce(4+)(aq), or oxone in acetate buffers) to catalyze the oxidation of water yielding O(2) evolution [G. Li et al. Energy Environ. Sci. 2, 230-238 (2009)]. The activation is thought to involve oxidation of the inorganic core [Mn(III)(μ-O)(2)Mn(IV)](3+) to generate the [Mn(IV)(μ-O)(2)Mn(IV)](4+) state 1(ox) first and then the highly reactive Mn oxyl species Mn(IV)O(•) through proton coupled electron transfer (PCET). Here, we investigate the step 1 → 1(ox) as compared to the analogous conversion in an oxomanganese complex without terminal water ligands, the [(bpy)(2) Mn (III) (μ-O)(2) Mn (IV) (bpy)(2)](3+) complex (2, bpy = 2,2'-bipyridyl). We characterize the oxidation in terms of free energy calculations of redox potentials and pKa's as directly compared to cyclic voltammogram measurements. We find that the pKa's of terminal water ligands depend strongly on the oxidation states of the Mn centers, changing by ~13 pH units (i.e., from 14 to 1) during the III, IV→IV, IV transition. Furthermore, we find that the oxidation potential of 1 is strongly dependent on pH (in contrast to the pH-independent redox potential of 2) as well as by coordination of Lewis base moieties (e.g., carboxylate groups) that competitively bind to Mn by exchange with terminal water ligands. The reported analysis of ligand binding free energies, pKa's and redox potentials indicates that the III, IV→IV, IV oxidation of 1 in the presence of acetate (AcO(-)) involves the following PCET: [H(2)O(terpy)Mn(III)(μ-O)(2)Mn(IV)(terpy)AcO](2+) → [HO(terpy)Mn(IV)(μ-O)(2)Mn(IV)(terpy)AcO](2+) + H(+) + e(-).
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Affiliation(s)
- Ting Wang
- Department of Chemistry, Yale University, PO Box 208107, New Haven, CT 06520-8107
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22
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Pushkar Y, Long X, Glatzel P, Brudvig GW, Dismukes GC, Collins TJ, Yachandra VK, Yano J, Bergmann U. Direct detection of oxygen ligation to the Mn(4)Ca cluster of photosystem II by X-ray emission spectroscopy. Angew Chem Int Ed Engl 2010; 49:800-3. [PMID: 20017172 DOI: 10.1002/anie.200905366] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Yulia Pushkar
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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23
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Wang T, Brudvig G, Batista VS. Characterization of proton coupled electron transfer in a biomimetic oxomanganese complex: Evaluation of the DFT B3LYP level of theory. J Chem Theory Comput 2010; 6:755-760. [PMID: 20607115 DOI: 10.1021/ct900615b] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The capabilities and limitations of the Becke-3-Lee-Yang-Parr (B3LYP) density functional theory (DFT) for modeling proton coupled electron transfer (PCET) in the mixed-valence oxomanganese complex 1 [(bpy)(2)Mn(III)(mu-O)(2)Mn(IV)(bpy)(2)](3+) (bpy = 2,2'-bipyridyl) are analyzed. Complex 1 serves as a prototypical synthetic model for studies of redox processes analogous to those responsible for water oxidation in the oxygen-evolving complex (OEC) of photosystem II (PSII). DFT B3LYP free energy calculations of redox potentials and pKa's are obtained according to the thermodynamic cycle formalism applied in conjunction with a continuum solvation model. We find that the pKa's of the oxo-ligands depend strongly on the oxidation states of the complex, changing by approximately 10 pH units (i.e., from pH~2 to pH~12) upon III,IV-->III,III reduction of complex 1. These computational results are consistent with the experimental pKa's determined by solution magnetic susceptibility and near-IR spectroscopy as well as with the pH dependence of the redox potential reported by cyclic voltammogram measurements, suggesting that the III,IV-->III,III reduction of complex 1 is coupled to protonation of the di-mu-oxo bridge as follows: [(bpy)(2)Mn(III)(mu-O)(2) Mn(IV)(bpy)(2)](3+)+H(+)+e(-)-->[(bpy)(2)Mn(III)(mu-O)(mu-OH)Mn(III)(bpy)(2)](3+). It is thus natural to expect that analogous redox processes might strongly modulate the pKa's of oxo and hydroxo/water ligands in the OEC of PSII, leading to deprotonation of the OEC upon oxidation state transitions.
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Affiliation(s)
- Ting Wang
- Department of Chemistry, Yale University, PO Box 208107, New Haven, CT 06520-8107
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24
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Inagaki S. Orbitals in inorganic chemistry: metal rings and clusters, hydronitrogens, and heterocyles. Top Curr Chem (Cham) 2010; 289:293-315. [PMID: 21279578 DOI: 10.1007/128_2008_41] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A chemical orbital theory is useful in inorganic chemistry. Some applications are described for understanding and designing of inorganic molecules. Among the topics included are: (1) valence electron rules to predict stabilities of three- and four-membered ring metals and for those of regular octahedral M(6) metal clusters solely by counting the number of valence electrons; (2) pentagon stability (stability of five- relative to six-membered rings in some classes of molecules), predicted and applied for understanding and designing saturated molecules of group XV elements; (3) properties of unsaturated hydronitrogens N( m )H( n ) in contrast to those of hydrocarbons C( m )H( n ); (4) unusually short nonbonded distances between metal atoms in cyclic molecules.
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Affiliation(s)
- Satoshi Inagaki
- Department of Chemistry, Faculty of Engineering, Gifu University, Yanagido, Gifu, 501-1193, Japan,
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25
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Pushkar Y, Long X, Glatzel P, Brudvig G, Dismukes G, Collins T, Yachandra V, Yano J, Bergmann U. Direct Detection of Oxygen Ligation to the Mn4Ca Cluster of Photosystem II by X-ray Emission Spectroscopy. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200905366] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Schinzel S, Kaupp M. Validation of broken-symmetry density functional methods for the calculation of electron paramagnetic resonance parameters of dinuclear mixed-valence MnIVMnIII complexes. CAN J CHEM 2009. [DOI: 10.1139/v09-094] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
. The EPR parameters of a series of dinuclear manganese(III,IV) complexes with mono(μ-oxo), bis(μ-oxo), (μ-oxo)(μ-carboxylato), bis(μ-oxo)(μ-carboxylato), and (μ-oxo)bis(μ-carboxylato) bridges were studied by broken-symmetry density functional (DFT) methods. The influence of the exchange-correlation functional on the agreement with experiment has been evaluated systematically for g tensors; 55Mn, 14N, and 1H hyperfine coupling tensors; and Heisenberg exchange couplings. 14N and 1H hyperfine couplings, 55Mn hyperfine anisotropies, g tensors, and exchange couplings are well described by hybrid functionals with moderate exact-exchange admixtures such as B3LYP. The isotropic 55Mn hyperfine couplings require larger exact-exchange admixtures. However, the errors of the B3LYP calculations are systematic and may be corrected by a constant scaling factor, providing good predictive power for a wide range of EPR parameters with broken-symmetry DFT and standard functionals. The influence of terminal and bridging ligands on structure, spin-density distributions, and EPR parameters are evaluated systematically. Computed hyperfine and g tensors are not covariant to each other. This may have consequences for spectra simulations. The nature of the broken-symmetry state and the origin of its spin contamination were analyzed by an expansion into restricted determinants, based on paired orbitals.
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Affiliation(s)
- Sandra Schinzel
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland D-97074, Würzburg, Germany
| | - Martin Kaupp
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland D-97074, Würzburg, Germany
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27
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Collomb M, Deronzier A. Electro‐ and Photoinduced Formation and Transformation of Oxido‐Bridged Multinuclear Mn Complexes. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200801141] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Marie‐Noëlle Collomb
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR‐5250, Institut de Chimie Moléculaire de Grenoble FR‐CNRS‐2607, Laboratoire de Chimie Inorganique Redox B. P. 53, 38041 Grenoble Cedex 9, France
| | - Alain Deronzier
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR‐5250, Institut de Chimie Moléculaire de Grenoble FR‐CNRS‐2607, Laboratoire de Chimie Inorganique Redox B. P. 53, 38041 Grenoble Cedex 9, France
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28
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Romain S, Duboc C, Neese F, Rivière E, Hanton L, Blackman A, Philouze C, Leprêtre JC, Deronzier A, Collomb MN. An Unusual Stable Mononuclear MnIIIBis-terpyridine Complex Exhibiting Jahn-Teller Compression: Electrochemical Synthesis, Physical Characterisation and Theoretical Study. Chemistry 2008; 15:980-8. [DOI: 10.1002/chem.200801442] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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29
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Younker JM, Krest CM, Jiang W, Krebs C, Bollinger JM, Green MT. Structural analysis of the Mn(IV)/Fe(III) cofactor of Chlamydia trachomatis ribonucleotide reductase by extended X-ray absorption fine structure spectroscopy and density functional theory calculations. J Am Chem Soc 2008; 130:15022-7. [PMID: 18937466 DOI: 10.1021/ja804365e] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The class Ic ribonucleotide reductase from Chlamydia trachomatis ( Ct) uses a stable Mn(IV)/Fe(III) cofactor to initiate nucleotide reduction by a free-radical mechanism. Extended X-ray absorption fine structure (EXAFS) spectroscopy and density functional theory (DFT) calculations are used to postulate a structure for this cofactor. Fe and Mn K-edge EXAFS data yield an intermetallic distance of approximately 2.92 A. The Mn data also suggest the presence of a short 1.74 A Mn-O bond. These metrics are compared to the results of DFT calculations on 12 cofactor models derived from the crystal structure of the inactive Fe 2(III/III) form of the protein. Models are differentiated by the protonation states of their bridging and terminal OH X ligands as well as the location of the Mn(IV) ion (site 1 or 2). The models that agree best with experimental observation feature a mu-1,3-carboxylate bridge (E120), terminal solvent (H 2O/OH) to site 1, one mu-O bridge, and one mu-OH bridge. The site-placement of the metal ions cannot be discerned from the available data.
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Affiliation(s)
- Jarod M Younker
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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31
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Fluoromanganese(III) complex of phenanthroline. Distortion isomers of Mn(phen)F3(H2O) stabilised by intermolecular interactions – Crystal structures, electronic spectra and DFT calculations. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2007.05.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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32
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Stamatatos TC, Christou G. Mixed valency in polynuclear MnII/MnIII, MnIII/MnIV and MnII/MnIII/MnIV clusters: a foundation for high-spin molecules and single-molecule magnets. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2008; 366:113-25. [PMID: 17827122 DOI: 10.1098/rsta.2007.2144] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Mixed-valent Mn/O dinuclear and polynuclear molecular compounds containing MnIII are almost without exception trapped valence. Large differences between the strengths of the exchange interactions within MnIIMnIII, MnIIIMnIII and MnIIIMnIV pairs lead to situations where MnIIIMnIV interactions, the strongest of the three mentioned and antiferromagnetic in nature, dominate the intramolecular spin alignments in trinuclear and higher nuclearity mixed-valent complexes and often result in molecules that have large, and sometimes abnormally large, values of molecular spin (S). When coupled to a large molecular magnetoanisotropy of the easy-axis-type (negative zero-field splitting parameter, D), also primarily resulting from individual Jahn-Teller distorted MnIII centres, such molecules will function as single-molecule magnets (molecular nanomagnets). Dissection of the structures and exchange interactions within a variety of mixed-valent Mnx cluster molecules with metal nuclearities of Mn4, Mn12 and Mn25 allows a ready rationalization of the observed S, D and overall magnetic properties in terms of competing antiferromagnetic exchange interactions within triangular subunits, resulting spin alignments and relative orientation of MnIII JT axes. Such an understanding has provided a stepping stone to the identification of a 'magnetically soft' Mn25 cluster whose groundstate spin S value can be significantly altered by relatively minor structural perturbations. Such 'spin tweaking' has allowed this cluster to be obtained in three different forms with three different groundstate S values.
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33
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Bersuker IB, Borshch SA. Vibronic Interactions in Polynuclear Mixed-Valence Clusters. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470141380.ch6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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34
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Brudvig GW, Crabtree RH. Bioinorganic Chemistry of Manganese Related to Photosynthetic Oxygen Evolution. PROGRESS IN INORGANIC CHEMISTRY 2007. [DOI: 10.1002/9780470166383.ch2] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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35
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Que L, True AE. Dinuclear Iron- and Manganese-Oxo Sites in Biology. PROGRESS IN INORGANIC CHEMISTRY 2007. [DOI: 10.1002/9780470166390.ch3] [Citation(s) in RCA: 213] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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36
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Richardson DE. Experimental Approaches to Measurement of Intramolecular Electron Transfer Rates. COMMENT INORG CHEM 2007. [DOI: 10.1080/02603598508079692] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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Mitra K, Mishra D, Biswas S, Lucas CR, Adhikary B. Binuclear manganese(III) complexes with carboxylate bridges: Synthesis, structure, electrochemistry and magnetic properties. Polyhedron 2006. [DOI: 10.1016/j.poly.2005.11.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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Mitra K, Biswas S, Lucas CR, Adhikary B. Manganese(III) complexes of N2O2 donor 5-bromosalicylideneimine ligands: Combined effects of electron withdrawing substituents and chelate ring size variations on electrochemical properties. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.01.013] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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39
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Wieghardt K, Bossek U, Gebert W. Synthese eines vierkernigen Mangan(IV)-Clusters mit Adamantan-Skelett: [C6H15N3)4Mn4O6]4+. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.19830950411] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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40
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Chen H, Tagore R, Das S, Incarvito C, Faller JW, Crabtree RH, Brudvig GW. General Synthesis of Di-μ-oxo Dimanganese Complexes as Functional Models for the Oxygen Evolving Complex of Photosystem II. Inorg Chem 2005; 44:7661-70. [PMID: 16212393 DOI: 10.1021/ic0509940] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of complexes with the formula [Mn(III/IV)2(mu-O)2(L)2(X)2]3+ have been prepared in situ from Mn(II)LCl2 precursors by a general preparative method (L = terpy, Cl-terpy, Br-terpy, Ph-terpy, tolyl-terpy, mesityl-terpy, t Bu3-terpy, EtO-terpy, py-phen, dpya, Me2N-terpy, or HO-terpy, and X = a labile ligand such as water, chloride, or sulfate). The parent complex, where L = terpy and X = water, is a functional model for the oxygen-evolving complex of photosystem II (Limburg, et al. J. Am. Chem. Soc. 2001, 123, 423-430). Crystals of Mn(II)(dpya)Cl2, Mn(II)(Ph-terpy)Cl2, Mn(II)(mesityl-terpy)Cl2, and an organic-soluble di-mu-oxo di-aqua dimanganese complex, [Mn(III/)(IV)2(mu-O)2(mesityl-terpy)2(OH2)2](NO3)3, were obtained and characterized by X-ray crystallography. Solutions of the in situ-formed di-mu-oxo dimanganese complexes were characterized by electrospray mass spectrometry, EPR spectroscopy, and UV-visible spectroscopy, and the rates of catalytic oxygen-evolving activity were assayed. The use of Mn(II)LCl2 precursors leads to higher product purity of the Mn dimers while achieving the 1:1 ligand to Mn stoichiometry appropriate for catalytic activity assay. These methods can be used to screen the catalytic activity of other di-mu-oxo dimanganese complexes generated by using a ligand library.
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Affiliation(s)
- Hongyu Chen
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA
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41
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Mukhopadhyay S, Mandal SK, Bhaduri S, Armstrong WH. Manganese clusters with relevance to photosystem II. Chem Rev 2005; 104:3981-4026. [PMID: 15352784 DOI: 10.1021/cr0206014] [Citation(s) in RCA: 481] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sumitra Mukhopadhyay
- Department of Chemistry, Eugene F Merkert Chemistry Center, Boston College, 2609 Beacon Street, Chestnut Hill, Massachusetts 02467-3860, USA
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42
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Biswas S, Mitra K, Chattopadhyay SK, Adhikary B, Lucas CR. Mononuclear manganese(II) and manganese(III) complexes of N2O donors involving amine and phenolate ligands: absorption spectra, electrochemistry and crystal structure of [Mn(L3)2](ClO4). TRANSIT METAL CHEM 2005. [DOI: 10.1007/s11243-004-7542-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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43
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Biswas S, Mitra K, Schwalbe C, Robert Lucas C, Chattopadhyay SK, Adhikary B. Synthesis and characterization of some Mn(II) and Mn(III) complexes of N,N′-o-phenylenebis(salicylideneimine)(LH2) and N,N′-o-phenylenebis(5-bromosalicylideneimine)(L′H2). Crystal structures of [Mn(L)(H2O)(ClO4)], [Mn(L)(NCS)] and an infinite linear chain of [Mn(L)(OAc)]. Inorganica Chim Acta 2005. [DOI: 10.1016/j.ica.2005.01.026] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Synthesis, spectroscopy and redox properties of mononuclear manganese(II) and manganese(IV) complexes with N-(aryl)-pyridine-2-aldimine (L) and its amide derivatives. X-ray structural characterization of [Mn(MeL)2(NCS)2] (MeL = N-(4-methylphenyl)-pyridine-2-aldimine). TRANSIT METAL CHEM 2005. [DOI: 10.1007/s11243-004-3225-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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45
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Yano J, Sauer K, Girerd JJ, Yachandra VK. Single crystal X- and Q-band EPR spectroscopy of a binuclear Mn(2)(III,IV) complex relevant to the oxygen-evolving complex of photosystem II. J Am Chem Soc 2004; 126:7486-95. [PMID: 15198595 PMCID: PMC3960403 DOI: 10.1021/ja038218j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The anisotropic g and hyperfine tensors of the Mn di-micro-oxo complex, [Mn(2)(III,IV)O(2)(phen)(4)](PF(6))(3).CH(3)CN, were derived by single-crystal EPR measurements at X- and Q-band frequencies. This is the first simulation of EPR parameters from single-crystal EPR spectra for multinuclear Mn complexes, which are of importance in several metalloenzymes; one of them is the oxygen-evolving complex in photosystem II (PS II). Single-crystal [Mn(2)(III,IV)O(2)(phen)(4)](PF(6))(3).CH(3)CN EPR spectra showed distinct resolved (55)Mn hyperfine lines in all crystal orientations, unlike single-crystal EPR spectra of other Mn(2)(III,IV) di-micro-oxo bridged complexes. We measured the EPR spectra in the crystal ab- and bc-planes, and from these spectra we obtained the EPR spectra of the complex along the unique a-, b-, and c-axes of the crystal. The crystal orientation was determined by X-ray diffraction and single-crystal EXAFS (Extended X-ray Absorption Fine Structure) measurements. In this complex, the three crystallographic axes, a, b, and c, are parallel or nearly parallel to the principal molecular axes of Mn(2)(III,IV)O(2)(phen)(4) as shown in the crystallographic data by Stebler et al. (Inorg. Chem. 1986, 25, 4743). This direct relation together with the resolved hyperfine lines significantly simplified the simulation of single-crystal spectra in the three principal directions due to the reduction of free parameters and, thus, allowed us to define the magnetic g and A tensors of the molecule with a high degree of reliability. These parameters were subsequently used to generate the solution EPR spectra at both X- and Q-bands with excellent agreement. The anisotropic g and hyperfine tensors determined by the simulation of the X- and Q-band single-crystal and solution EPR spectra are as follows: g(x) = 1.9887, g(y) = 1.9957, g(z) = 1.9775, and hyperfine coupling constants are A(III)(x) = |171| G, A(III)(y) = |176| G, A(III)(z) = |129| G, A(IV)(x) = |77| G, A(IV)(y) = |74| G, A(IV)(z) = |80| G.
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46
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Monomeric versus dimeric structures in ternary complexes of manganese(II) with derivatives of benzoic acid and nitrogenous bases: structural details and spectral properties. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2003.12.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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47
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Baldwin J, Krebs C, Saleh L, Stelling M, Huynh BH, Bollinger JM, Riggs-Gelasco P. Structural characterization of the peroxodiiron(III) intermediate generated during oxygen activation by the W48A/D84E variant of ribonucleotide reductase protein R2 from Escherichia coli. Biochemistry 2004; 42:13269-79. [PMID: 14609338 DOI: 10.1021/bi035198p] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The diiron(II) cluster in the R2 subunit of Escherichia coli ribonucleotide reductase (RNR) activates oxygen to generate a mu-oxodiiron(III) cluster and the stable tyrosyl radical that is critical for the conversion of ribonucleotides to deoxyribonucleotides. Like those in other diiron carboxylate proteins, such as methane monooxygenase (MMO), the R2 diiron cluster is proposed to activate oxygen by formation of a peroxodiiron(III) intermediate followed by an oxidizing high-valent cluster. Substitution of key active site residues results in perturbations of the normal oxygen activation pathway. Variants in which the active site ligand, aspartate (D) 84, is changed to glutamate (E) are capable of accumulating a mu-peroxodiiron(III) complex in the reaction pathway. Using rapid freeze-quench techniques, this intermediate in a double variant, R2-W48A/D84E, was trapped for characterization by Mössbauer and X-ray absorption spectroscopy. These samples contained 70% peroxodiiron(III) intermediate and 30% diferrous R2. An Fe-Fe distance of 2.5 A was found to be associated with the peroxo intermediate. As has been proposed for the structures of the higher valent intermediates in both R2 and MMO, carboxylate shifts to a mu-(eta(1),eta(2)) or a mu-1,1 conformation would most likely be required to accommodate the short 2.5 A Fe-Fe distance. In addition, the diferrous form of the enzyme present in the reacted sample has a longer Fe-Fe distance (3.5 A) than does a sample of anaerobically prepared diferrous R2 (3.4 A). Possible explanations for this difference in detected Fe-Fe distance include an O(2)-induced conformational change prior to covalent chemistry or differing O(2) reactivity among multiple diiron(II) forms of the cluster.
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Affiliation(s)
- Jeffrey Baldwin
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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48
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Petrie S, Mukhopadhyay S, Armstrong WH, Stranger R. Theoretical analysis of the [Mn2(μ-oxo)2(μ-carboxylato)2]+core. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407512a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Cañada-Vilalta C, Streib WE, Huffman JC, O'Brien TA, Davidson ER, Christou G. Polynuclear Manganese Complexes with the Dicarboxylate Ligand m-Phenylenedipropionate: A Hexanuclear Mixed-Valence (3MnIII, 3MnIV) Complex. Inorg Chem 2003; 43:101-15. [PMID: 14704058 DOI: 10.1021/ic034973m] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dicarboxylate group m-phenylenedipropionate (mpdp(2)(-)) has been used for the synthesis of four new Mn compounds of different nuclearities and oxidation states: [Mn(2)O(mpdp)(bpy)(2)(H(2)O)(MeCN)](ClO(4))(2) (3), [Mn(3)O(mpdp)(3)(py)(3)](ClO(4)) (4), [Mn(3)O(mpdp)(3)(py)(3)] (5), and [Mn(6)O(7)(mpdp)(3)(bpy)(3)](ClO(4)) (6). Compound 3 (2Mn(III)) contains a [Mn(2)(micro-O)](4+) core, whereas 5 (Mn(II), 2Mn(III)) and 4 (3Mn(III)) contain the [Mn(3)(micro(3)-O)](6+,7+) core, respectively. In all three compounds, the mpdp(2)(-) ligand is flexible enough to adopt the sites occupied by two monocarboxylates in structurally related compounds, without noticeable distortion of the cores. Variable-temperature magnetic susceptibility studies establish that 3 and 5 have ground-state spin values of S = 0 and S = 1/2, respectively. Compound 6 is a highly unusual 3Mn(III), 3Mn(IV) trapped-valent compound, and it is also a new structural type, with six Mn atoms disposed in a distorted trigonal antiprismatic topology. Its electronic structure has been explored by variable-temperature measurements of its dc magnetic susceptibility, magnetization vs field response, and EPR spectrum. The magnetic data indicate that it possesses an S = 3/2 ground state with an axial zero-field splitting parameter of D = -0.79 cm(-)(1), and this conclusion is supported by the EPR data. The combined results demonstrate the ligating flexibility of the mpdp(2)(-) ligand and its usefulness in the synthesis of a variety of Mn(x) species.
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Affiliation(s)
- Cristina Cañada-Vilalta
- Department of Chemistry and the Molecular Structure Center, Indiana University, Bloomington, Indiana 47405-7102, USA
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50
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Dubois L, Caspar R, Jacquamet L, Petit PE, Charlot MF, Baffert C, Collomb MN, Deronzier A, Latour JM. Binuclear manganese compounds of potential biological significance. Part 2. Mechanistic study of hydrogen peroxide disproportionation by dimanganese complexes: the two oxygen atoms of the peroxide end up in a dioxo intermediate. Inorg Chem 2003; 42:4817-27. [PMID: 12895103 DOI: 10.1021/ic020646n] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dimanganese(II,II) complexes 1a [Mn(2)(L)(OAc)(2)(CH(3)OH)](ClO(4)) and 1b [Mn(2)(L)(OBz)(2)(H(2)O)](ClO(4)), where HL is the unsymmetrical phenol ligand 2-(bis-(2-pyridylmethyl)aminomethyl)-6-((2-pyridylmethyl)(benzyl)aminomethyl)-4-methylphenol, react with hydrogen peroxide in acetonitrile solution. The disproportionation reaction was monitored by electrospray ionization mass spectrometry (ESI-MS) and EPR and UV-visible spectroscopies. Extensive EPR studies have shown that a species (2) exhibiting a 16-line spectrum at g approximately 2 persists during catalysis. ESI-MS experiments conducted similarly during catalysis associate 2a with a peak at 729 (791 for 2b) corresponding to the formula [Mn(III)Mn(IV)(L)(O)(2)(OAc)](+) ([Mn(III)Mn(IV)(L)(O)(2)(OBz)](+) for 2b). At the end of the reaction, it is partly replaced by a species (3) possessing a broad unfeatured signal at g approximately 2. ESI-MS associates 3a with a peak at 713 (775 for 3b) corresponding to the formula [Mn(II)Mn(III)(L)(O)(OAc)](+) ([Mn(II)Mn(III)(L)(O)(OBz)](+) for 3b). In the presence of H(2)(18)O, these two peaks move to 733 and to 715 indicating the presence of two and one oxo ligands, respectively. When H(2)(18)O(2) is used, 2a and 3a are labeled showing that the oxo ligands come from H(2)O(2). Interestingly, when an equimolar mixture of H(2)O(2) and H(2)(18)O(2) is used, only unlabeled and doubly labeled 2a/b are formed, showing that its two oxo ligands come from the same H(2)O(2) molecule. All these experiments lead to attribute the formula [Mn(III)Mn(IV)(L)(O)(2)(OAc)](+) to 2a and to 3a the formula [Mn(II)Mn(III)(L)(O)(OAc)](+). Freeze-quench/EPR experiments revealed that 2a appears at 500 ms and that another species with a 6-line spectrum is formed transiently at ca. 100 ms. 2a was prepared by reaction of 1a with tert-butyl hydroperoxide as shown by EPR and UV-visible spectroscopies and ESI-MS experiments. Its structure was studied by X-ray absorption experiments which revealed the presence of two or three O atoms at 1.87 A and three or two N/O atoms at 2.14 A. In addition one N atom was found at a longer distance (2.3 A) and one Mn at 2.63 A. 2a can be one-electron oxidized at E(1/2) = 0.91 V(NHE) (DeltaE(1/2) = 0.08 V) leading to its Mn(IV)Mn(IV) analogue. The formation of 2a from 1a was monitored by UV-visible and X-ray absorption spectroscopies. Both concur to show that an intermediate Mn(II)Mn(III) species, resembling 4a [Mn(2)(L)(OAc)(2)(H(2)O)](ClO(4))(2), the one-electron-oxidized form of 1a, is formed initially and transforms into 2a. The structures of the active intermediates 2 and 3 are discussed in light of their spectroscopic properties, and potential mechanisms are considered and discussed in the context of the biological reaction.
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Affiliation(s)
- Lionel Dubois
- Laboratoire de Physicochimie des Métaux en Biologie, FRE 2427 CEA-CNRS-UJF, CEA-Grenoble, 38054 Grenoble Cedex 9, France
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