Sustained Water Oxidation by [Mn4O4]7+ Core Complexes Inspired by Oxygenic Photosynthesis

被引:71
作者
Brimblecombe, Robin [1 ,2 ,3 ]
Kolling, Derrick R. J. [1 ,2 ]
Bond, Alan M. [3 ]
Dismukes, G. Charles [1 ,2 ]
Swiegers, Gerhard F. [4 ]
Spiccia, Leone [3 ]
机构
[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
[2] Princeton Univ, Princeton Environm Inst, Princeton, NJ 08544 USA
[3] Monash Univ, Sch Chem, Clayton, Vic 3800, Australia
[4] Univ Wollongong, Intelligent Polymer Res Inst, ARC Ctr Excellence Electromat Sci, Wollongong, NSW 2522, Australia
关键词
PHOTOSYSTEM-II; FUNCTIONAL-MODEL; DIMANGANESE CATALASE; ELECTRONIC-STRUCTURE; MANGANESE COMPLEXES; HYDROGEN-PRODUCTION; OXIDIZING COMPLEX; CUBANE COMPLEXES; ACTIVE-SITE; RESONANCE;
D O I
10.1021/ic9006982
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The bioinspired Mn-oxo cubane complex, [Mn4O4L6](+) 1b(+) (L = (p-MeO-Ph)(2)PO2), is a model of the photosynthetic O-2-evolving complex. It is able to electro-oxidize water at 1.00 V (vs Ag/AgCl) under illumination by UV-visible light when suspended in a proton-conducting membrane (Nafion) coated onto a conducting electrode. Electrochemical measurements, and UV-visible, NMR, and EPR spectroscopies are interpreted to indicate that 1b+ is the dominant electro-active species in the Nafion, both before and after catalytic cycling, and thus correlates closely with activity. The observation of a possible intermediate and free phosphinate ligand within the Nafion suggests a catalytic mechanism involving photolytic disruption of a phosphinate ligand, followed by 02 formation, and subsequent reassembly of the cubane structure. Several factors that influence catalytic turnover such as the applied potential, illumination wavelength, and energy have been examined in respect of attaining optimum catalytic activity. Catalytic turnover frequencies of 20-270 molecules O-2 h(-1) catalyst(-1) at an overpotential of 0.38 V plus light (275-750 nm) and turnovers numbers >1000 molecules O-2 catalyst(-1) are observed. The 1b(+)-Nafion system is among the most active and durable molecular water oxidation catalysts known.
引用
收藏
页码:7269 / 7279
页数:11
相关论文
共 53 条
[1]   How fast can Photosystem II split water? Kinetic performance at high and low frequencies [J].
Ananyev, G ;
Dismukes, GC .
PHOTOSYNTHESIS RESEARCH, 2005, 84 (1-3) :355-365
[2]   Mechanism for the electrooxidation of water to OH and O bonded to platinum: quantum chemical theory [J].
Anderson, AB ;
Neshev, NM ;
Sidik, RA ;
Shiller, P .
ELECTROCHIMICA ACTA, 2002, 47 (18) :2999-3008
[3]   CADMIUM FERROCYANIDE OVERLAYERS - REGULATION OF PHOTOINDUCED CHARGE-TRANSFER AT THE N-CDSE/[FE(CN)6](4-/3-)INTERFACE [J].
ARENT, DJ ;
RUBIN, HD ;
CHEN, YL ;
BOCARSLY, AB .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1992, 139 (10) :2705-2712
[4]  
Bard A.J., 1990, Electrochemical Methods: Fundamentals and Applications, V2nd
[5]   Mechanism of water oxidation by the μ-oxo dimer [(bpy)2(H2O)RuIIIORuIII(OH2)(bpy)2]4+ [J].
Binstead, RA ;
Chronister, CW ;
Ni, JF ;
Hartshorn, CM ;
Meyer, TJ .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2000, 122 (35) :8464-8473
[6]  
Brimblecombe R, 2008, ANGEW CHEM, V120, P7445
[7]   Electrochemical investigation of Mn4O4-cubane water-oxidizing clusters [J].
Brimblecombe, Robin ;
Bond, Alan M. ;
Dismukes, G. Charles ;
Swiegers, Gerhard F. ;
Spiccia, Leone .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2009, 11 (30) :6441-6449
[8]   Functional models for the oxygen-evolving complex of photosystem II [J].
Cady, Clyde W. ;
Crabtree, Robert H. ;
Brudvig, Gary W. .
COORDINATION CHEMISTRY REVIEWS, 2008, 252 (3-4) :444-455
[9]   Transition from hydrogen atom to hydride abstraction by Mn4O4(O2PPh2)6 versus [Mn4O4(O2PPh2)6]+:: O-H bond dissociation energies and the formation of Mn4O3(OH)(O2PPh2)6 [J].
Carrell, TG ;
Bourles, E ;
Lin, M ;
Dismukes, GC .
INORGANIC CHEMISTRY, 2003, 42 (09) :2849-2858
[10]   Oxidative catalysis by Mn4O46+ cubane complexes [J].
Carrell, TG ;
Cohen, S ;
Dismukes, GC .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2002, 187 (01) :3-15