251
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Bledowski M, Wang L, Ramakrishnan A, Khavryuchenko OV, Khavryuchenko VD, Ricci PC, Strunk J, Cremer T, Kolbeck C, Beranek R. Visible-light photocurrent response of TiO2–polyheptazine hybrids: evidence for interfacial charge-transfer absorption. Phys Chem Chem Phys 2011; 13:21511-9. [DOI: 10.1039/c1cp22861g] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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252
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Wasylenko DJ, Ganesamoorthy C, Borau-Garcia J, Berlinguette CP. Electrochemical evidence for catalytic water oxidation mediated by a high-valent cobalt complex. Chem Commun (Camb) 2011; 47:4249-51. [DOI: 10.1039/c0cc05522k] [Citation(s) in RCA: 318] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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253
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Najafpour MM, Govindjee. Oxygen evolving complex in Photosystem II: Better than excellent. Dalton Trans 2011; 40:9076-84. [DOI: 10.1039/c1dt10746a] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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254
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Busch M, Ahlberg E, Panas I. Electrocatalytic oxygen evolution from water on a Mn(iii–v) dimer model catalyst—A DFT perspective. Phys Chem Chem Phys 2011; 13:15069-76. [DOI: 10.1039/c0cp02132f] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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255
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Zhou H, Fan T, Zhang D. An Insight into Artificial Leaves for Sustainable Energy Inspired by Natural Photosynthesis. ChemCatChem 2010. [DOI: 10.1002/cctc.201000266] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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256
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Harman WH, Harris TD, Freedman DE, Fong H, Chang A, Rinehart JD, Ozarowski A, Sougrati MT, Grandjean F, Long GJ, Long JR, Chang CJ. Slow magnetic relaxation in a family of trigonal pyramidal iron(II) pyrrolide complexes. J Am Chem Soc 2010; 132:18115-26. [PMID: 21141856 DOI: 10.1021/ja105291x] [Citation(s) in RCA: 296] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present a family of trigonal pyramidal iron(II) complexes supported by tris(pyrrolyl-α-methyl)amine ligands of the general formula [M(solv)(n)][(tpa(R))Fe] (M = Na, R = tert-butyl (1), phenyl (4); M = K, R = mesityl (2), 2,4,6-triisopropylphenyl (3), 2,6-difluorophenyl (5)) and their characterization by X-ray crystallography, Mössbauer spectroscopy, and high-field EPR spectroscopy. Expanding on the discovery of slow magnetic relaxation in the recently reported mesityl derivative 2, this homologous series of high-spin iron(II) complexes enables an initial probe of how the ligand field influences the static and dynamic magnetic behavior. Magnetization experiments reveal large, uniaxial zero-field splitting parameters of D = -48, -44, -30, -26, and -6.2 cm(-1) for 1-5, respectively, demonstrating that the strength of axial magnetic anisotropy scales with increasing ligand field strength at the iron(II) center. In the case of 2,6-difluorophenyl substituted 5, high-field EPR experiments provide an independent determination of the zero-field splitting parameter (D = -4.397(9) cm(-1)) that is in reasonable agreement with that obtained from fits to magnetization data. Ac magnetic susceptibility measurements indicate field-dependent, thermally activated spin reversal barriers in complexes 1, 2, and 4 of U(eff) = 65, 42, and 25 cm(-1), respectively, with the barrier of 1 constituting the highest relaxation barrier yet observed for a mononuclear transition metal complex. In addition, in the case of 1, the large range of temperatures in which slow relaxation is observed has enabled us to fit the entire Arrhenius curve simultaneously to three distinct relaxation processes. Finally, zero-field Mössbauer spectra collected for 1 and 4 also reveal the presence of slow magnetic relaxation, with two independent relaxation barriers in 4 corresponding to the barrier obtained from ac susceptibility data and to the 3D energy gap between the M(S) = ±2 and ±1 levels, respectively.
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Affiliation(s)
- W Hill Harman
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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257
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Jin N, Lahaye DE, Groves JT. A “Push−Pull” Mechanism for Heterolytic O−O Bond Cleavage in Hydroperoxo Manganese Porphyrins. Inorg Chem 2010; 49:11516-24. [DOI: 10.1021/ic1015274] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ning Jin
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Dorothée E. Lahaye
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - John T. Groves
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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258
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Groysman S, Villagrán D, Nocera DG. Pseudotetrahedral d(0), d(1), and d(2) metal-oxo cores within a tris(alkoxide) platform. Inorg Chem 2010; 49:10759-61. [PMID: 21049961 DOI: 10.1021/ic101968s] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Low-coordinate first-row metal complexes of d(0) [vanadium(V)], d(1) [chromium(V)], and d(2) [chromium(IV)] assume the unusual ligand field of a pseudotetrahedron when supported by a tripodal tBu(2)(Me)CO(-) alkoxide framework. Structural, spectroscopic, and reactivity studies, supported by density functional theory calculations, indicate that the d electrons in the chromium(V) and -(IV) oxo complexes reside in metal-oxygen antibonding orbitals, engendering disparate reactivity of the metal-oxo, depending on the number of d electrons present.
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Affiliation(s)
- Stanislav Groysman
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
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259
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Surendranath Y, Kanan MW, Nocera DG. Mechanistic Studies of the Oxygen Evolution Reaction by a Cobalt-Phosphate Catalyst at Neutral pH. J Am Chem Soc 2010; 132:16501-9. [DOI: 10.1021/ja106102b] [Citation(s) in RCA: 968] [Impact Index Per Article: 69.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yogesh Surendranath
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, United States
| | - Matthew W. Kanan
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, United States
| | - Daniel G. Nocera
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, United States
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260
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Gerken JB, Landis EC, Hamers RJ, Stahl SS. Fluoride-modulated cobalt catalysts for electrochemical oxidation of water under non-alkaline conditions. CHEMSUSCHEM 2010; 3:1176-1179. [PMID: 20725926 DOI: 10.1002/cssc.201000161] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- James B Gerken
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave, 53706-1322, USA
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261
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Efremenko I, Poverenov E, Martin JML, Milstein D. DFT Study of the Structure and Reactivity of the Terminal Pt(IV)-Oxo Complex Bearing No Electron-Withdrawing Ligands. J Am Chem Soc 2010; 132:14886-900. [DOI: 10.1021/ja105197x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Irena Efremenko
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76000, Israel
| | - Elena Poverenov
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76000, Israel
| | - Jan M. L. Martin
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76000, Israel
| | - David Milstein
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76000, Israel
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262
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Yoshida M, Masaoka S, Abe J, Sakai K. Catalysis of Mononuclear Aquaruthenium Complexes in Oxygen Evolution from Water: A New Radical Coupling Path using Hydroxocerium(IV) Species. Chem Asian J 2010; 5:2369-78. [PMID: 20857479 DOI: 10.1002/asia.201000323] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Masaki Yoshida
- Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan
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263
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McAlpin JG, Surendranath Y, Dinca M, Stich TA, Stoian SA, Casey WH, Nocera DG, Britt RD. EPR evidence for Co(IV) species produced during water oxidation at neutral pH. J Am Chem Soc 2010; 132:6882-3. [PMID: 20433197 DOI: 10.1021/ja1013344] [Citation(s) in RCA: 327] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thin-film water oxidation catalysts (Co-Pi) prepared by electrodeposition from phosphate electrolyte and Co(NO(3))(2) have been characterized by electron paramagnetic resonance (EPR) spectroscopy. Co-Pi catalyst films exhibit EPR signals corresponding to populations of both Co(II) and Co(IV). As the deposition voltage is increased into the region where water oxidation prevails, the population of Co(IV) rises and the population of Co(II) decreases. The changes in the redox speciation of the film can also be induced, in part, by prolonged water oxidation catalysis in the absence of additional catalyst deposition. These results provide spectroscopic evidence for the formation of Co(IV) species during water oxidation catalysis at neutral pH.
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Affiliation(s)
- J Gregory McAlpin
- Department of Chemistry, University of California, 1 Shields Avenue, Davis, California 95616-0935, USA
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264
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Takaoka A, Gerber LCH, Peters JC. Access to well-defined ruthenium(I) and osmium(I) metalloradicals. Angew Chem Int Ed Engl 2010; 49:4088-91. [PMID: 20455234 PMCID: PMC2980334 DOI: 10.1002/anie.201001199] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The first examples of well-defined mononuclear Ru(I) and Os(I) complexes have been prepared and crystallographically characterized. EPR spectroscopy and DFT calculations indicate metalloradical character. The Ru(I) and Os(I) metalloradicals exhibits both 1-electron and 2-electron redox reactivity. The latter process affords unusual imido/nitrene complexes with substantial radical character on the “ArN” moiety.
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Affiliation(s)
- Ayumi Takaoka
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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265
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Wasylenko DJ, Ganesamoorthy C, Koivisto BD, Berlinguette CP. Examination of Water Oxidation by Catalysts Containing Cofacial Metal Sites. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000099] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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266
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Takaoka A, Gerber L, Peters J. Access to Well-Defined Ruthenium(I) and Osmium(I) Metalloradicals. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201001199] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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267
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Tolman WB. Binding and activation of N2O at transition-metal centers: recent mechanistic insights. Angew Chem Int Ed Engl 2010; 49:1018-24. [PMID: 20058284 DOI: 10.1002/anie.200905364] [Citation(s) in RCA: 179] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
No laughing matter, nitrous oxide's role in stratospheric ozone depletion and as a greenhouse gas has stimulated great interest in developing and understanding its decomposition, particularly through the use of transition-metal promoters. Recent advances in our understanding of the reaction pathways for N(2)O reduction by metal ions in the gas phase and in heterogeneous, homogeneous, and biological catalytic systems have provided provocative ideas about the structure and properties of metal N(2)O adducts and derived intermediates. These ideas are likely to inform efforts to design more effective catalysts for N(2)O remediation.
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Affiliation(s)
- William B Tolman
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55410, USA.
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268
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Streit BR, Blanc B, Lukat-Rodgers GS, Rodgers KR, DuBois JL. How active-site protonation state influences the reactivity and ligation of the heme in chlorite dismutase. J Am Chem Soc 2010; 132:5711-24. [PMID: 20356038 PMCID: PMC3050645 DOI: 10.1021/ja9082182] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chlorite dismutase catalyzes O(2) release from chlorite with exquisite efficiency and specificity. The spectroscopic properties, ligand binding affinities, and steady-state kinetics of chlorite dismutase from Dechloromonas aromatica were examined over pH 3-11.5 to gain insight into how the protonation state of the heme environment influences dioxygen formation. An acid-base transition was observed by UV/visible and resonance Raman (rR) spectroscopy with a pK(a) of 8.7, 2-3 pH units below analogous transitions observed in typical His-ligated peroxidases. This transition marks the conversion of a five-coordinate high-spin Fe(III) to a mixed high/low-spin ferric hydroxide, as confirmed by rR spectroscopy. The two Fe-OH stretching frequencies are quite low, consistent with a weak Fe-OH bond, despite the nearly neutral imidazole side chain of the proximal histidine ligand. The hydroxide is proposed to interact strongly with a distal H-bond donor, thereby weakening the Fe-OH bond. The rR spectra of Cld-CO as a function of pH reveal two forms of the complex, one in which there is minimal interaction of distal residues with the carbonyl oxygen and another, acidic form in which the oxygen is under the influence of positive charge. Recent crystallographic data reveal arginine 183 as the lone H-bond-donating residue in the distal pocket. It is likely that this Arg is the strong, positively charged H-bond donor implicated by vibrational data to interact with exogenous axial heme ligands. The same Arg in its neutral (pK(a) approximately 6.5) form also appears to act as the active-site base in binding reactions of protonated ligands, such as HCN, to ferric Cld. The steady-state profile for the rate of chlorite decomposition is characterized by these same pK(a) values. The five-coordinate high-spin acidic Cld is more active than the alkaline hydroxide-bound form. The acid form decomposes chlorite most efficiently when the distal Arg is protonated/cationic (maximum k(cat) = 2.0(+/-0.6) x 10(5) s(-1), k(cat)/K(M) = 3.2(+/-0.4) x 10(7) M(-1) s(-1), pH 5.2, 4 degrees C) and to a somewhat lesser extent when it acts as a H-bond donor to the axial hydroxide ligand under alkaline conditions.
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Affiliation(s)
- Bennett R. Streit
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556
| | - Béatrice Blanc
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556
| | - Gudrun S. Lukat-Rodgers
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050
| | - Kenton R. Rodgers
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050
| | - Jennifer L. DuBois
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556
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269
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Wang LP, Wu Q, Van Voorhis T. Acid−Base Mechanism for Ruthenium Water Oxidation Catalysts. Inorg Chem 2010; 49:4543-53. [DOI: 10.1021/ic100075k] [Citation(s) in RCA: 134] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lee-Ping Wang
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
| | - Qin Wu
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973
| | - Troy Van Voorhis
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
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270
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Mankad NP, Müller P, Peters JC. Catalytic N−N Coupling of Aryl Azides To Yield Azoarenes via Trigonal Bipyramid Iron−Nitrene Intermediates. J Am Chem Soc 2010; 132:4083-5. [DOI: 10.1021/ja910224c] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Neal P. Mankad
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - Peter Müller
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - Jonas C. Peters
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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271
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Nyhlén J, Duan L, Åkermark B, Sun L, Privalov T. Evolution of O2in a Seven-Coordinate RuIVDimer Complex with a [HOHOH]−Bridge: A Computational Study. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200906439] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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272
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Nyhlén J, Duan L, Åkermark B, Sun L, Privalov T. Evolution of O2in a Seven-Coordinate RuIVDimer Complex with a [HOHOH]−Bridge: A Computational Study. Angew Chem Int Ed Engl 2010; 49:1773-7. [DOI: 10.1002/anie.200906439] [Citation(s) in RCA: 146] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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273
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Lippert CA, Arnstein SA, Sherrill CD, Soper JD. Redox-Active Ligands Facilitate Bimetallic O2 Homolysis at Five-Coordinate Oxorhenium(V) Centers. J Am Chem Soc 2010; 132:3879-92. [DOI: 10.1021/ja910500a] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cameron A. Lippert
- School of Chemistry and Biochemistry, Center for Computational Molecular Science and Technology, and College of Computing, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
| | - Stephen A. Arnstein
- School of Chemistry and Biochemistry, Center for Computational Molecular Science and Technology, and College of Computing, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
| | - C. David Sherrill
- School of Chemistry and Biochemistry, Center for Computational Molecular Science and Technology, and College of Computing, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
| | - Jake D. Soper
- School of Chemistry and Biochemistry, Center for Computational Molecular Science and Technology, and College of Computing, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
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274
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Wasylenko DJ, Ganesamoorthy C, Koivisto BD, Henderson MA, Berlinguette CP. Insight into Water Oxidation by Mononuclear Polypyridyl Ru Catalysts. Inorg Chem 2010; 49:2202-9. [PMID: 20131861 DOI: 10.1021/ic902024s] [Citation(s) in RCA: 232] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Derek J. Wasylenko
- Department of Chemistry and Institute for Sustainable Energy, Environment & Economy, University of Calgary, 2500 University Drive N.W., Calgary T2N-1N4, Canada
| | - Chelladurai Ganesamoorthy
- Department of Chemistry and Institute for Sustainable Energy, Environment & Economy, University of Calgary, 2500 University Drive N.W., Calgary T2N-1N4, Canada
| | - Bryan D. Koivisto
- Department of Chemistry and Institute for Sustainable Energy, Environment & Economy, University of Calgary, 2500 University Drive N.W., Calgary T2N-1N4, Canada
| | - Matthew A. Henderson
- Department of Chemistry, University of Victoria, Victoria, British Columbia V38-3 V6, Canada
| | - Curtis P. Berlinguette
- Department of Chemistry and Institute for Sustainable Energy, Environment & Economy, University of Calgary, 2500 University Drive N.W., Calgary T2N-1N4, Canada
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275
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Tolman W. Mechanistische Einblicke in die Bindung und Aktivierung von N2O an Übergangsmetallzentren. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200905364] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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276
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Orlandi M, Argazzi R, Sartorel A, Carraro M, Scorrano G, Bonchio M, Scandola F. Ruthenium polyoxometalate water splitting catalyst: very fast hole scavenging from photogenerated oxidants. Chem Commun (Camb) 2010; 46:3152-4. [DOI: 10.1039/b926823e] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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277
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McGuire Jr. R, Dogutan DK, Teets TS, Suntivich J, Shao-Horn Y, Nocera DG. Oxygen reduction reactivity of cobalt(ii) hangman porphyrins. Chem Sci 2010. [DOI: 10.1039/c0sc00281j] [Citation(s) in RCA: 208] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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278
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Duan L, Fischer A, Xu Y, Sun L. Isolated seven-coordinate Ru(IV) dimer complex with [HOHOH](-) bridging ligand as an intermediate for catalytic water oxidation. J Am Chem Soc 2009; 131:10397-9. [PMID: 19601625 DOI: 10.1021/ja9034686] [Citation(s) in RCA: 392] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
With the inspiration from an oxygen evolving complex (OEC) in Photosystem II (PSII), a mononuclear Ru(II) complex with a tetradentate ligand containing two carboxylate groups has been synthesized and structurally characterized. This Ru(II) complex showed efficient catalytic properties toward water oxidation by the chemical oxidant cerium(IV) ammonium nitrate. During the process of catalytic water oxidation, Ru(III) and Ru(IV) species have been successfully isolated as intermediates. To our surprise, X-ray crystallography together with HR-MS revealed that the Ru(IV) species is a seven-coordinate Ru(IV) dimer complex containing a [HOHOH](-) bridging ligand. This bridging ligand has a short O...O distance and is hydrogen bonded to two water molecules. The discovery of this very uncommon seven-coordinate Ru(IV) dimer together with a hydrogen bonding network may contribute to a deeper understanding of the mechanism for catalytic water oxidation. It will also provide new possibilities for the design of more efficient catalysts for water oxidation, which is the key step for solar energy conversion into hydrogen by light-driven water splitting, the ultimate challenge in artificial photosynthesis.
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Affiliation(s)
- Lele Duan
- Department of Chemistry, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
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279
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Fukuzumi S, Fujioka N, Kotani H, Ohkubo K, Lee YM, Nam W. Mechanistic Insights into Hydride-Transfer and Electron-Transfer Reactions by a Manganese(IV)−Oxo Porphyrin Complex. J Am Chem Soc 2009; 131:17127-34. [DOI: 10.1021/ja9045235] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shunichi Fukuzumi
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan, Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea, and Department of Chemistry and Nano Science, Center for Biomimetic Systems, Ewha Womans University, Seoul 120-750, Korea
| | - Naofumi Fujioka
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan, Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea, and Department of Chemistry and Nano Science, Center for Biomimetic Systems, Ewha Womans University, Seoul 120-750, Korea
| | - Hiroaki Kotani
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan, Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea, and Department of Chemistry and Nano Science, Center for Biomimetic Systems, Ewha Womans University, Seoul 120-750, Korea
| | - Kei Ohkubo
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan, Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea, and Department of Chemistry and Nano Science, Center for Biomimetic Systems, Ewha Womans University, Seoul 120-750, Korea
| | - Yong-Min Lee
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan, Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea, and Department of Chemistry and Nano Science, Center for Biomimetic Systems, Ewha Womans University, Seoul 120-750, Korea
| | - Wonwoo Nam
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan, Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea, and Department of Chemistry and Nano Science, Center for Biomimetic Systems, Ewha Womans University, Seoul 120-750, Korea
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Abstract
Personalized energy (PE) is a transformative idea that provides a new modality for the planet's energy future. By providing solar energy to the individual, an energy supply becomes secure and available to people of both legacy and nonlegacy worlds and minimally contributes to an increase in the anthropogenic level of carbon dioxide. Because PE will be possible only if solar energy is available 24 h a day, 7 days a week, the key enabler for solar PE is an inexpensive storage mechanism. HY (Y = halide or OH(-)) splitting is a fuel-forming reaction of sufficient energy density for large-scale solar storage, but the reaction relies on chemical transformations that are not understood at the most basic science level. Critical among these are multielectron transfers that are proton-coupled and involve the activation of bonds in energy-poor substrates. The chemistry of these three italicized areas is developed, and from this platform, discovery paths leading to new hydrohalic acid- and water-splitting catalysts are delineated. The latter water-splitting catalyst captures many of the functional elements of photosynthesis. In doing so, a highly manufacturable and inexpensive method for solar PE storage has been discovered.
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Affiliation(s)
- Daniel G Nocera
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA.
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281
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Cramer CJ, Truhlar DG. Density functional theory for transition metals and transition metal chemistry. Phys Chem Chem Phys 2009; 11:10757-816. [PMID: 19924312 DOI: 10.1039/b907148b] [Citation(s) in RCA: 1079] [Impact Index Per Article: 71.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We introduce density functional theory and review recent progress in its application to transition metal chemistry. Topics covered include local, meta, hybrid, hybrid meta, and range-separated functionals, band theory, software, validation tests, and applications to spin states, magnetic exchange coupling, spectra, structure, reactivity, and catalysis, including molecules, clusters, nanoparticles, surfaces, and solids.
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Affiliation(s)
- Christopher J Cramer
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455-0431, USA.
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282
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Bozoglian F, Romain S, Ertem MZ, Todorova TK, Sens C, Mola J, Rodríguez M, Romero I, Benet-Buchholz J, Fontrodona X, Cramer CJ, Gagliardi L, Llobet A. The Ru−Hbpp Water Oxidation Catalyst. J Am Chem Soc 2009; 131:15176-87. [DOI: 10.1021/ja9036127] [Citation(s) in RCA: 231] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fernando Bozoglian
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Sophie Romain
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Mehmed Z. Ertem
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Tanya K. Todorova
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Cristina Sens
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Joaquim Mola
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Montserrat Rodríguez
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Isabel Romero
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Xavier Fontrodona
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Christopher J. Cramer
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Laura Gagliardi
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
| | - Antoni Llobet
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain, Department of Chemistry, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland, Serveis Tècnics de Recerca and Departament de Química, Universitat de Girona, E-17071 Girona, Spain, and Departament de Química,
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283
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DeYonker NJ, Williams TG, Imel AE, Cundari TR, Wilson AK. Accurate thermochemistry for transition metal complexes from first-principles calculations. J Chem Phys 2009; 131:024106. [DOI: 10.1063/1.3160667] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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284
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285
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Teets TS, Nocera DG. Halogen Photoreductive Elimination from Gold(III) Centers. J Am Chem Soc 2009; 131:7411-20. [DOI: 10.1021/ja9009937] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Thomas S. Teets
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307
| | - Daniel G. Nocera
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307
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286
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Kuznetsov AE, Geletii YV, Hill CL, Morokuma K, Musaev DG. Dioxygen and Water Activation Processes on Multi-Ru-Substituted Polyoxometalates: Comparison with the “Blue-Dimer” Water Oxidation Catalyst. J Am Chem Soc 2009; 131:6844-54. [DOI: 10.1021/ja900017g] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Aleksey E. Kuznetsov
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322
| | - Yurii V. Geletii
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322
| | - Craig L. Hill
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322
| | - Keiji Morokuma
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322
| | - Djamaladdin G. Musaev
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322
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287
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Kohl SW, Weiner L, Schwartsburd L, Konstantinovski L, Shimon LJW, Ben-David Y, Iron MA, Milstein D. Consecutive Thermal H
2
and Light-Induced O
2
Evolution from Water Promoted by a Metal Complex. Science 2009; 324:74-7. [DOI: 10.1126/science.1168600] [Citation(s) in RCA: 423] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Stephan W. Kohl
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
- Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Lev Weiner
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
- Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Leonid Schwartsburd
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
- Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Leonid Konstantinovski
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
- Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Linda J. W. Shimon
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
- Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yehoshoa Ben-David
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
- Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Mark A. Iron
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
- Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - David Milstein
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
- Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel
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288
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Surendranath Y, Dincǎ M, Nocera DG. Electrolyte-Dependent Electrosynthesis and Activity of Cobalt-Based Water Oxidation Catalysts. J Am Chem Soc 2009; 131:2615-20. [DOI: 10.1021/ja807769r] [Citation(s) in RCA: 540] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yogesh Surendranath
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
| | - Mircea Dincǎ
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
| | - Daniel G. Nocera
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
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289
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290
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Kanan MW, Surendranath Y, Nocera DG. Cobalt–phosphate oxygen-evolving compound. Chem Soc Rev 2009; 38:109-14. [DOI: 10.1039/b802885k] [Citation(s) in RCA: 627] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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291
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Nocera DG. Personalized energy: the home as a solar power station and solar gas station. CHEMSUSCHEM 2009; 2:387-390. [PMID: 19408259 DOI: 10.1002/cssc.200900040] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Point-of-use solar energy would generate the exact amount of energy any one individual needs, at the location where it is needed. Such a means of energy supply would create a revolution in society's approach to energy use, and allow a more level playing field for all. This Viewpoint considers some of the key enablers for this technology.
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Affiliation(s)
- Daniel G Nocera
- Massachusetts Institute of Technology, Department of Chemistry, 77 Massachusetts Ave. 6-335, Cambridge, MA 02139-4307, USA.
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292
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Kurz P. Oxygen evolving reactions catalysed by manganese–oxo-complexes adsorbed on clays. Dalton Trans 2009:6103-8. [DOI: 10.1039/b904532e] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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293
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294
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Concepcion JJ, Jurss JW, Templeton JL, Meyer TJ. One Site is Enough. Catalytic Water Oxidation by [Ru(tpy)(bpm)(OH2)]2+ and [Ru(tpy)(bpz)(OH2)]2+. J Am Chem Soc 2008; 130:16462-3. [PMID: 19554681 DOI: 10.1021/ja8059649] [Citation(s) in RCA: 536] [Impact Index Per Article: 33.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Javier J. Concepcion
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Jonah W. Jurss
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Joseph L. Templeton
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Thomas J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
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295
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Yang X, Baik MH. The Mechanism of Water Oxidation Catalysis Promoted by [tpyRu(IV)═O]2L3+: A Computational Study. J Am Chem Soc 2008; 130:16231-40. [DOI: 10.1021/ja8034043] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaofan Yang
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, and Institut für Chemie, Technische Universität Berlin, D-10623 Berlin, Germany
| | - Mu-Hyun Baik
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, and Institut für Chemie, Technische Universität Berlin, D-10623 Berlin, Germany
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296
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Mechanism of and exquisite selectivity for O-O bond formation by the heme-dependent chlorite dismutase. Proc Natl Acad Sci U S A 2008; 105:15654-9. [PMID: 18840691 DOI: 10.1073/pnas.0804279105] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Chlorite dismutase (Cld) is a heme b-dependent, O-O bond forming enzyme that transforms toxic chlorite (ClO(2)(-)) into innocuous chloride and molecular oxygen. The mechanism and specificity of the reaction with chlorite and alternate oxidants were investigated. Chlorite is the sole source of dioxygen as determined by oxygen-18 labeling studies. Based on ion chromatography and mass spectrometry results, Cld is highly specific for the dismutation of chlorite to chloride and dioxygen with no other side products. Cld does not use chlorite as an oxidant for oxygen atom transfer and halogenation reactions (using cosubstrates guaiacol, thioanisole, and monochlorodimedone, respectively). When peracetic acid or H(2)O(2) was used as an alternative oxidant, oxidation and oxygen atom transfer but not halogenation reactions occurred. Monitoring the reaction of Cld with peracetic acid by rapid-mixing UV-visible spectroscopy, the formation of the high valent compound I intermediate, [(Por(*+))Fe(IV) = O], was observed [k(1) = (1.28 +/- 0.04) x 10(6) M(-1) s(-1)]. Compound I readily decayed to form compound II in a manner that is independent of peracetic acid concentration (k(2) = 170 +/- 20 s(-1)). Both compound I and a compound II-associated tryptophanyl radical that resembles cytochrome c peroxidase (Ccp) compound I were observed by EPR under freeze-quench conditions. The data collectively suggest an O-O bond-forming mechanism involving generation of a compound I intermediate via oxygen atom transfer from chlorite, and subsequent recombination of the resulting hypochlorite and compound I.
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297
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Renger G, Renger T. Photosystem II: The machinery of photosynthetic water splitting. PHOTOSYNTHESIS RESEARCH 2008; 98:53-80. [PMID: 18830685 DOI: 10.1007/s11120-008-9345-7] [Citation(s) in RCA: 192] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Accepted: 07/29/2008] [Indexed: 05/26/2023]
Abstract
This review summarizes our current state of knowledge on the structural organization and functional pattern of photosynthetic water splitting in the multimeric Photosystem II (PS II) complex, which acts as a light-driven water: plastoquinone-oxidoreductase. The overall process comprises three types of reaction sequences: (1) photon absorption and excited singlet state trapping by charge separation leading to the ion radical pair [Formula: see text] formation, (2) oxidative water splitting into four protons and molecular dioxygen at the water oxidizing complex (WOC) with P680+* as driving force and tyrosine Y(Z) as intermediary redox carrier, and (3) reduction of plastoquinone to plastoquinol at the special Q(B) binding site with Q(A)-* acting as reductant. Based on recent progress in structure analysis and using new theoretical approaches the mechanism of reaction sequence (1) is discussed with special emphasis on the excited energy transfer pathways and the sequence of charge transfer steps: [Formula: see text] where (1)(RC-PC)* denotes the excited singlet state (1)P680* of the reaction centre pigment complex. The structure of the catalytic Mn(4)O(X)Ca cluster of the WOC and the four step reaction sequence leading to oxidative water splitting are described and problems arising for the electronic configuration, in particular for the nature of redox state S(3), are discussed. The unravelling of the mode of O-O bond formation is of key relevance for understanding the mechanism of the process. This problem is not yet solved. A multistate model is proposed for S(3) and the functional role of proton shifts and hydrogen bond network(s) is emphasized. Analogously, the structure of the Q(B) site for PQ reduction to PQH(2) and the energetic and kinetics of the two step redox reaction sequence are described. Furthermore, the relevance of the protein dynamics and the role of water molecules for its flexibility are briefly outlined. We end this review by presenting future perspectives on the water oxidation process.
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Affiliation(s)
- Gernot Renger
- Max Volmer Laboratory for Biophysical Chemistry, Berlin Institute of Technology, Berlin, Germany.
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298
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Kanan MW, Nocera DG. In situ formation of an oxygen-evolving catalyst in neutral water containing phosphate and Co2+. Science 2008; 321:1072-5. [PMID: 18669820 DOI: 10.1126/science.1162018] [Citation(s) in RCA: 2302] [Impact Index Per Article: 143.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The utilization of solar energy on a large scale requires its storage. In natural photosynthesis, energy from sunlight is used to rearrange the bonds of water to oxygen and hydrogen equivalents. The realization of artificial systems that perform "water splitting" requires catalysts that produce oxygen from water without the need for excessive driving potentials. Here we report such a catalyst that forms upon the oxidative polarization of an inert indium tin oxide electrode in phosphate-buffered water containing cobalt (II) ions. A variety of analytical techniques indicates the presence of phosphate in an approximate 1:2 ratio with cobalt in this material. The pH dependence of the catalytic activity also implicates the hydrogen phosphate ion as the proton acceptor in the oxygen-producing reaction. This catalyst not only forms in situ from earth-abundant materials but also operates in neutral water under ambient conditions.
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Affiliation(s)
- Matthew W Kanan
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA
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299
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Betley TA, Surendranath Y, Childress MV, Alliger GE, Fu R, Cummins CC, Nocera DG. A ligand field chemistry of oxygen generation by the oxygen-evolving complex and synthetic active sites. Philos Trans R Soc Lond B Biol Sci 2008; 363:1293-303; discussion 1303. [PMID: 17971328 PMCID: PMC2614088 DOI: 10.1098/rstb.2007.2226] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Oxygen-oxygen bond formation and O2 generation occur from the S4 state of the oxygen-evolving complex (OEC). Several mechanistic possibilities have been proposed for water oxidation, depending on the formal oxidation state of the Mn atoms. All fall under two general classifications: the AB mechanism in which nucleophilic oxygen (base, B) attacks electrophilic oxygen (acid, A) of the Mn4Ca cluster or the RC mechanism in which radical-like oxygen species couple within OEC. The critical intermediate in either mechanism involves a metal oxo, though the nature of this oxo for AB and RC mechanisms is disparate. In the case of the AB mechanism, assembly of an even-electron count, high-valent metal-oxo proximate to a hydroxide is needed whereas, in an RC mechanism, two odd-electron count, high-valent metal oxos are required. Thus the two mechanisms give rise to very different design criteria for functional models of the OEC active site. This discussion presents the electron counts and ligand geometries that support metal oxos for AB and RC O-O bond-forming reactions. The construction of architectures that bring two oxygen functionalities together under the purview of the AB and RC scenarios are described.
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Affiliation(s)
| | | | | | | | | | | | - Daniel G Nocera
- Department of Chemistry, Massachusetts Institute of Technology77 Massachusetts Avenue, 6-335, Cambridge, MA 02139-4307, USA
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300
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Yang JY, Liu SY, Korendovych IV, Rybak-Akimova EV, Nocera DG. Hangman salen platforms containing dibenzofuran scaffolds. CHEMSUSCHEM 2008; 1:941-949. [PMID: 18985639 DOI: 10.1002/cssc.200800099] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The synthesis of salen ligands bearing two rigid dibenzofuran spacers functionalized with carboxylic acid and benzoic acid groups completes a series of "Hangman" ligands with the acid functionalities differentially extended across the molecular cleft. Stopped-flow studies show that a high-valent metal oxo intermediate is produced at Hangman platforms when H(2)O(2) is employed as a primary oxidant. The activity of this oxo species in promoting the disproportionation of hydrogen peroxide and olefin epoxidations is discussed in the context of the distance between the acid group and the metal center. The chemistry of the Hangman oxo complexes described here provides a roadmap for water-splitting chemistry.
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Affiliation(s)
- Jenny Y Yang
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
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