351
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Friedle S, Kodanko JJ, Morys AJ, Hayashi T, Moënne-Loccoz P, Lippard SJ. Modeling the syn disposition of nitrogen donors in non-heme diiron enzymes. Synthesis, characterization, and hydrogen peroxide reactivity of diiron(III) complexes with the syn N-donor ligand H2BPG2DEV. J Am Chem Soc 2009; 131:14508-20. [PMID: 19757795 DOI: 10.1021/ja906137y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In order to model the syn disposition of histidine residues in carboxylate-bridged non-heme diiron enzymes, we prepared a new dinucleating ligand, H(2)BPG(2)DEV, that provides this geometric feature. The ligand incorporates biologically relevant carboxylate functionalities, which have not been explored as extensively as nitrogen-only analogues. Three novel oxo-bridged diiron(III) complexes, [Fe(2)(mu-O)(H(2)O)(2)(BPG(2)DEV)](ClO(4))(2) (6), [Fe(2)(mu-O)(mu-O(2)CAr(iPrO))(BPG(2)DEV)](ClO(4)) (7), and [Fe(2)(mu-O)(mu-CO(3))(BPG(2)DEV)] (8), were prepared. Single-crystal X-ray structural characterization confirms that two pyridyl groups are bound syn with respect to the Fe-Fe vector in these compounds. The carbonato-bridged complex 8 forms quantitatively from 6 in a rapid reaction with gaseous CO(2) in organic solvents. A common maroon-colored intermediate (lambda(max) = 490 nm; epsilon = 1500 M(-1) cm(-1)) forms in reactions of 6, 7, or 8 with H(2)O(2) and NEt(3) in CH(3)CN/H(2)O solutions. Mass spectrometric analyses of this species, formed using (18)O-labeled H(2)O(2), indicate the presence of a peroxide ligand bound to the oxo-bridged diiron(III) center. The Mossbauer spectrum at 90 K of the EPR-silent intermediate exhibits a quadrupole doublet with delta = 0.58 mm/s and DeltaE(Q) = 0.58 mm/s. The isomer shift is typical for a peroxodiiron(III) species, but the quadrupole splitting parameter is unusually small compared to those of related complexes. These Mossbauer parameters are comparable to those observed for a peroxo intermediate formed in the reaction of reduced toluene/o-xylene monooxygenase hydroxylase with dioxygen. Resonance Raman studies reveal an unusually low-energy O-O stretching mode in the peroxo intermediate that is consistent with a short diiron distance. Although peroxodiiron(III) intermediates generated from 6, 7, and 8 are poor O-atom-transfer catalysts, they display highly efficient catalase activity, with turnover numbers up to 10,000. In contrast to hydrogen peroxide reactions of diiron(III) complexes that lack a dinucleating ligand, the intermediates generated here could be re-formed in significant quantities after a second addition of H(2)O(2), as observed spectroscopically and by mass spectrometry.
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Affiliation(s)
- Simone Friedle
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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352
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Song YJ, Lee SW, Jang KH, Kim C, Kim Y. Tetra-μ-benzoato-bis-{[trans-1-(2-pyrid-yl)-2-(4-pyrid-yl)ethyl-ene]zinc(II)}. Acta Crystallogr Sect E Struct Rep Online 2009; 65:m1495-6. [PMID: 21578547 PMCID: PMC2972024 DOI: 10.1107/s1600536809045048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2009] [Accepted: 10/28/2009] [Indexed: 11/21/2022]
Abstract
The paddle-wheel-type centrosymmetric dinuclear title complex, [Zn2(C7H5O2)4(C12H10N2)2], contains four bridging benzoate groups and two terminal trans-1-(2-pyridyl)-2-(4-pyridyl)ethylene (L) ligands. The inversion center is located between the two ZnII atoms. The octahedral coordination around the ZnII atom, with four O atoms in the equatorial plane, is completed by an N atom of the L molecule [Zn—N = 2.0198 (15) Å] and by the second ZnII atom [Zn⋯Zn = 2.971 (8) Å]. The ZnII atom is 0.372 Å out of the plane of the four coordinating O atoms.
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353
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Lyakin OY, Bryliakov KP, Britovsek GJP, Talsi EP. EPR spectroscopic trapping of the active species of nonheme iron-catalyzed oxidation. J Am Chem Soc 2009; 131:10798-9. [PMID: 19722657 DOI: 10.1021/ja902659c] [Citation(s) in RCA: 127] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The key intermediate of a bioinspired iron catalyst for selective hydrocarbon oxidation based on hydrogen peroxide and an iron complex with a tetradentate aminopyridine ligand was trapped by EPR. On the basis of EPR and reactivity data this intermediate is tentatively proposed to be an oxoiron(V) complex.
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Affiliation(s)
- Oleg Y Lyakin
- Siberian Branch of the Russian Academy of Sciences, Boreskov Institute of Catalysis, Novosibirsk 630090, Pr. Lavrentieva 5, Russia
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354
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Rabe V, Frey W, Baro A, Laschat S, Bauer M, Bertagnolli H, Rajagopalan S, Asthalter T, Roduner E, Dilger H, Glaser T, Schnieders D. Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900516] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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355
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Synthetic and structural studies of metal complexes derived from tris(3,5-bimethyl-pyrazolylmethyl)amine and pyridine derivatives. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.07.066] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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356
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Siewert I, Limberg C. Low-Molecular-Weight Analogues of the Soluble Methane Monooxygenase (sMMO): From the Structural Mimicking of Resting States and Intermediates to Functional Models. Chemistry 2009; 15:10316-28. [DOI: 10.1002/chem.200901910] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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357
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Li F, Hor TA. Facile Synthesis of Nitrogen Tetradentate Ligands and Their Applications in CuI-Catalyzed N-Arylation and Azide-Alkyne Cycloaddition. Chemistry 2009; 15:10585-92. [DOI: 10.1002/chem.200901014] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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358
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Singh UP, Aggarwal V, Kashyap S. High-spin iron(III) complexes: structural, spectroscopic, and photochemical studies. J COORD CHEM 2009. [DOI: 10.1080/00958970903012793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Udai P. Singh
- a Department of Chemistry , Indian Institute of Technology Roorkee , Roorkee–247 667, India
| | - Vaibhave Aggarwal
- a Department of Chemistry , Indian Institute of Technology Roorkee , Roorkee–247 667, India
| | - Sujata Kashyap
- a Department of Chemistry , Indian Institute of Technology Roorkee , Roorkee–247 667, India
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359
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Ostermeier M, Limberg C, Herwig C, Ziemer B. Stabilizing the Boat Conformation of Piperazines Coordinated to Iron(II):iso-Butyl Substituents Lead to Robust Oxidation Catalysts via Hyperconjugation. Z Anorg Allg Chem 2009. [DOI: 10.1002/zaac.200900275] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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360
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Berben LA, Peters JC. Dimanganese and diiron complexes of a binucleating cyclam ligand: four-electron, reversible oxidation chemistry at high potentials. Inorg Chem 2009; 47:11669-79. [PMID: 19007157 DOI: 10.1021/ic801289x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of a binucleating biscyclam ligand cyclam(2)(i)PrO [where cyclam(2)(i)PrO = (1,3-bis[1,4,8,11-tetraazacyclododecane]-2-hydroxypropane] with Mn(CF(3)SO(3))(2) or Fe(CF(3)SO(3))(2).2MeCN gives [(cyclam(2)(i)PrO)Mn(2)(mu-CF(3)SO(3))](CF(3)SO(3))(2) (4) and [(cyclam(2)(i)PrO)Fe(2)(mu-CF(3)SO(3))](CF(3)SO(3))(2) (6), respectively. [(cyclam(2)(i)PrO)Mn(2)(mu-N(3))](CF(3)SO(3))(2) (5) is obtained by the reaction of 4 with NaN(3). Single-crystal X-ray structural characterization indicates that in each of the bimetallic complexes the two metal centers are facially coordinated by a cyclam ligand and bridged by the isopropoxide linker of the ligand in addition to a triflate counteranion. Upon replacement of the triflate bridge with the single-atom bridge of an end-bound azide ligand in 5, the Mn-Mn distance decreases by 0.38 A. All of the complexes are high-spin and colorless and were characterized by magnetic susceptibility measurements, electron paramagnetic resonance spectroscopy, and electrochemical methods. Magnetic susceptibility measurements indicate that 4 and 6 are weakly antiferromagnetically coupled while 5 is weakly ferromagnetically coupled. Cyclic voltammetry measurements indicate that the hard donor amine ligands impart high oxidation potentials to the metal centers and that four-electron redox activity can be accessed with a narrow potential range of 0.72 V. Upon inclusion of water in the cyclic voltammetry experiment, the oxidative waves shift to higher potentials, which is consistent with water binding the manganese centers. The diiron complex 6 displays four one-electron redox couples, of which the final two are irreversible. Inclusion of water in the cyclic voltammetry measurement for compound 6 resulted in two sets of shifted peaks, which suggests that two molecules of water bind the diiron core. In accordance with the observed reversibility of the electrochemical results, the dimanganese complex is more efficient than the diiron complex for mediating O-atom transfer to organic substrates and is an excellent hydrogen peroxide disproportionation catalyst, with the reaction proceeding for over 20,000 turnovers.
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Affiliation(s)
- Louise A Berben
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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361
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Wang LL, Sun YM, Yu ZY, Qi ZN, Liu CB. Theoretical Investigation on Triagonal Symmetry Copper Trimers: Magneto-Structural Correlation and Spin Frustration. J Phys Chem A 2009; 113:10534-9. [PMID: 19775173 DOI: 10.1021/jp9045897] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Li-Li Wang
- Institute of Theoretical Chemistry, Shandong University, Jinan 250100, P. R. China, School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China, College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China, and Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100 Shandong, P. R. China
| | - You-Min Sun
- Institute of Theoretical Chemistry, Shandong University, Jinan 250100, P. R. China, School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China, College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China, and Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100 Shandong, P. R. China
| | - Zhang-Yu Yu
- Institute of Theoretical Chemistry, Shandong University, Jinan 250100, P. R. China, School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China, College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China, and Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100 Shandong, P. R. China
| | - Zhong-Nan Qi
- Institute of Theoretical Chemistry, Shandong University, Jinan 250100, P. R. China, School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China, College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China, and Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100 Shandong, P. R. China
| | - Cheng-Bu Liu
- Institute of Theoretical Chemistry, Shandong University, Jinan 250100, P. R. China, School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China, College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China, and Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100 Shandong, P. R. China
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362
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Charkin OP, Makarov AV, Klimenko NM. Theoretical study of the model reaction of oxidation of methane to methyl alcohol by Fe(P)O(NH2) and related oxoferryl porphyrin complexes (P = C20H12N4). RUSS J INORG CHEM+ 2009. [DOI: 10.1134/s0036023609090149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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363
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Mandal PC, Bhattacharyya J, Das S, Mukhopadhyay S, Kirschenbaum LJ. Mechanistic studies on the oxidation of pyruvic acid by an oxo-bridged diiron(III,III) complex in aqueous acidic media. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.07.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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364
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Liu T, Li B, Singleton ML, Hall MB, Darensbourg MY. Sulfur oxygenates of biomimetics of the diiron subsite of the [FeFe]-hydrogenase active site: properties and oxygen damage repair possibilities. J Am Chem Soc 2009; 131:8296-307. [PMID: 19507910 DOI: 10.1021/ja9016528] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This study explores the site specificity (sulfur vs the Fe-Fe bond) of oxygenation of diiron (Fe(I)Fe(I) and Fe(II)Fe(II)) organometallics that model the 2-iron subsite in the active site of [FeFe]-hydrogenase: (mu-pdt)[Fe(CO)(2)L][Fe(CO)(2)L'] (L = L' = CO (1); L = PPh(3), L' = CO (2); L = L' = PMe(3) (4)) and (mu-pdt)(mu-H)[Fe(CO)(2)PMe(3)](2) (5). DFT computations find that the Fe-Fe bond in the Fe(I)Fe(I) diiron models is thermodynamically favored to produce the mu-oxo or oxidative addition product, Fe(II)-O-Fe(II); nevertheless, the sulfur-based HOMO-1 accounts for the experimentally observed mono- and bis-O-atom adducts at sulfur, i.e., (mu-pst)[Fe(CO)(2)L][Fe(CO)(2)L'] (pst = -S(CH(2))(3)S(O)-, 1,3-propanesulfenatothiolate; L = L' = CO (1-O); L = PPh(3), L' = CO (2-O); L = L' = PMe(3) (4-O)) and (mu-pds)[Fe(CO)(2)L][Fe(CO)(2)L'] (pds = -(O)S(CH(2))(3)S(O)-, 1,3-propanedisulfenato; L = PPh(3), L' = CO (2-O(2))). The Fe(II)(mu-H)Fe(II) diiron model (5), for which the HOMO is largely of sulfur character, exclusively yields S-oxygenation. The depressing effect of such bridging ligand modification on the dynamic NMR properties arising from rotation of the Fe(CO)(3) correlates with higher barriers to the CO/PMe(3) exchange of (mu-pst)[Fe(CO)(3)](2) as compared to (mu-pdt)[Fe(CO)(3)](2). Five molecular structures are confirmed by X-ray diffraction: 1-O, 2-O, 2-O(2), 4-O, and 6. Deoxygenation with reclamation of the mu-pdt parent complex occurs in a proton/electron-coupled process. The possible biological relevance of oxygenation and deoxygenation studies is discussed.
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Affiliation(s)
- Tianbiao Liu
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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365
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Jensen KP, Bell, CB, Clay MD, Solomon EI. Peroxo-Type Intermediates in Class I Ribonucleotide Reductase and Related Binuclear Non-Heme Iron Enzymes. J Am Chem Soc 2009; 131:12155-71. [DOI: 10.1021/ja809983g] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kasper P. Jensen
- Department of Chemistry, Stanford University, 333 Campus Drive, Mudd Building, Stanford, California 94305-5080, and DTU-Chemistry, Technical University of Denmark, Building 207, DK 2800 Kgs. Lyngby, Denmark
| | - Caleb B. Bell,
- Department of Chemistry, Stanford University, 333 Campus Drive, Mudd Building, Stanford, California 94305-5080, and DTU-Chemistry, Technical University of Denmark, Building 207, DK 2800 Kgs. Lyngby, Denmark
| | - Michael D. Clay
- Department of Chemistry, Stanford University, 333 Campus Drive, Mudd Building, Stanford, California 94305-5080, and DTU-Chemistry, Technical University of Denmark, Building 207, DK 2800 Kgs. Lyngby, Denmark
| | - Edward I. Solomon
- Department of Chemistry, Stanford University, 333 Campus Drive, Mudd Building, Stanford, California 94305-5080, and DTU-Chemistry, Technical University of Denmark, Building 207, DK 2800 Kgs. Lyngby, Denmark
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366
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Lenze M, Bauer EB. Oxidation of activated methylene groups to ketones catalyzed by new iron phosphinooxazoline complexes and by iron(II) triflate. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcata.2009.05.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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367
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A Novel Dinucleating Ligand-Containing Hexabenzimidazoles and Its Dinuclear Zinc Complex Bridged by a Carboxylate Group for the Hydrolysis of 2-Hydroxypropyl-p-nitrophenyl phosphate. J Inorg Organomet Polym Mater 2009. [DOI: 10.1007/s10904-009-9294-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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368
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Johansson AJ, Noack H, Siegbahn PEM, Xue G, Que L. Observed enhancement of the reactivity of a biomimetic diiron complex by the addition of water - mechanistic insights from theoretical modeling. Dalton Trans 2009:6741-50. [PMID: 19690685 DOI: 10.1039/b907263b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The biomimetic diiron complex [Fe(III)Fe(IV)(mu-O)(2)(5-Me(3)-TPA)(2)](ClO(4))(3) (TPA = tris(2-pyridylmethyl)amine) has been found to be capable of oxidizing 9,10-dihydroanthracene in a solution of acetonitrile. Addition of water up to 1 M makes the reaction 200 times faster, suggesting that the water molecule in some way activates the catalyst for more efficient substrate oxidation. It is proposed that the enhanced reactivity results from the coordination of a water molecule to the iron(III) half of the complex, converting the bis-mu-oxo structure of the diiron complex to a ring-opened form where one of the bridging oxo groups is transformed into a terminal oxo group on iron(IV). The suggested mechanism is supported by DFT (B3LYP) calculations and transition state theory. Two different computational models of the diiron complex are used to model the hydroxylation of cyclohexane to cyclohexanol. Model has a bis-mu-oxo diiron core (diamond core) while model represents the "open core" analogue with one bridging mu-oxo group, a terminal oxo ligand on iron(IV), and a water molecule coordinated to iron(III). The computational results clearly suggest that the terminal oxo group is more reactive than the bridging oxo group. The free energy of activation is 7.0 kcal mol(-1) lower for the rate limiting step when the oxidant has a terminal oxo group than when both oxo groups are bridging the irons.
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369
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Siluvai GS, Murthy NN. X-ray structure and spectroscopic characterization of doubly-bridged binuclear copper(II) complexes in symmetric and asymmetric coordination environments. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.04.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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370
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Chakrabarty R, Sarmah P, Saha B, Chakravorty S, Das BK. Catalytic Properties of Cobalt(III)−Oxo Cubanes in the TBHP Oxidation of Benzylic Alcohols. Inorg Chem 2009; 48:6371-9. [DOI: 10.1021/ic802115n] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
| | - Purabi Sarmah
- Department of Chemistry, Gauhati University, Guwahati 781 014, India
| | - Bapan Saha
- Department of Chemistry, Gauhati University, Guwahati 781 014, India
| | | | - Birinchi K. Das
- Department of Chemistry, Gauhati University, Guwahati 781 014, India
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371
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Monfared HH, Sadighian S, Kamyabi MA, Mayer P. Iron(III) aroylhydrazone complexes: Structure, electrochemical studies and catalytic activity in oxidation of olefins. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcata.2009.02.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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372
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Cappillino PJ, Tarves PC, Rowe GT, Lewis AJ, Harvey M, Rogge C, Stassinopoulos A, Lo W, Armstrong WH, Caradonna JP. Synthesis and characterization of a family of binuclear non-heme iron monooxygenase model compounds: Evidence for a “phenolate/amide carbonyl (PAC) shift” upon oxidation. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.09.036] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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373
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374
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Min KS, DiPasquale AG, Rheingold AL, White HS, Miller JS. Observation of Redox-Induced Electron Transfer and Spin Crossover for Dinuclear Cobalt and Iron Complexes with the 2,5-Di-tert-butyl-3,6-dihydroxy-1,4-benzoquinonate Bridging Ligand. J Am Chem Soc 2009; 131:6229-36. [DOI: 10.1021/ja900909u] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kil Sik Min
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, Department of Chemistry Education, Kyungpook National University, Daegu 702-701, Republic of Korea, and Department of Chemistry, University of California, San Diego, La Jolla, California 92093-0358
| | - Antonio G. DiPasquale
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, Department of Chemistry Education, Kyungpook National University, Daegu 702-701, Republic of Korea, and Department of Chemistry, University of California, San Diego, La Jolla, California 92093-0358
| | - Arnold L. Rheingold
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, Department of Chemistry Education, Kyungpook National University, Daegu 702-701, Republic of Korea, and Department of Chemistry, University of California, San Diego, La Jolla, California 92093-0358
| | - Henry S. White
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, Department of Chemistry Education, Kyungpook National University, Daegu 702-701, Republic of Korea, and Department of Chemistry, University of California, San Diego, La Jolla, California 92093-0358
| | - Joel S. Miller
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, Department of Chemistry Education, Kyungpook National University, Daegu 702-701, Republic of Korea, and Department of Chemistry, University of California, San Diego, La Jolla, California 92093-0358
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375
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Ghattas W, Serhan Z, El Bakkali-Taheri N, Réglier M, Kodera M, Hitomi Y, Simaan AJ. Synthesis and Characterization of a Binuclear Iron(III) Complex Bridged by 1-Aminocyclopropane-1-carboxylic Acid. Ethylene Production in the Presence of Hydrogen Peroxide. Inorg Chem 2009; 48:3910-2. [DOI: 10.1021/ic9001626] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wadih Ghattas
- Institut des Sciences Moléculaires de Marseille, ISM2 UMR 6263, CNRS, Faculté des Sciences de Saint-Jérôme, Université Paul-Cézanne Aix-Marseille III, 13397 Marseille Cedex 20, France, and Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Zeinab Serhan
- Institut des Sciences Moléculaires de Marseille, ISM2 UMR 6263, CNRS, Faculté des Sciences de Saint-Jérôme, Université Paul-Cézanne Aix-Marseille III, 13397 Marseille Cedex 20, France, and Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Nadia El Bakkali-Taheri
- Institut des Sciences Moléculaires de Marseille, ISM2 UMR 6263, CNRS, Faculté des Sciences de Saint-Jérôme, Université Paul-Cézanne Aix-Marseille III, 13397 Marseille Cedex 20, France, and Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Marius Réglier
- Institut des Sciences Moléculaires de Marseille, ISM2 UMR 6263, CNRS, Faculté des Sciences de Saint-Jérôme, Université Paul-Cézanne Aix-Marseille III, 13397 Marseille Cedex 20, France, and Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Masahito Kodera
- Institut des Sciences Moléculaires de Marseille, ISM2 UMR 6263, CNRS, Faculté des Sciences de Saint-Jérôme, Université Paul-Cézanne Aix-Marseille III, 13397 Marseille Cedex 20, France, and Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Yutaka Hitomi
- Institut des Sciences Moléculaires de Marseille, ISM2 UMR 6263, CNRS, Faculté des Sciences de Saint-Jérôme, Université Paul-Cézanne Aix-Marseille III, 13397 Marseille Cedex 20, France, and Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - A. Jalila Simaan
- Institut des Sciences Moléculaires de Marseille, ISM2 UMR 6263, CNRS, Faculté des Sciences de Saint-Jérôme, Université Paul-Cézanne Aix-Marseille III, 13397 Marseille Cedex 20, France, and Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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376
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Lykourinou V, Hanafy AI, Bisht KS, Angerhofer A, Ming LJ. Iron(III) Complexes of Metal-Binding Copolymers as Proficient Catalysts for Acid Hydrolysis of Phosphodiesters and Oxidative DNA Cleavage - Insight into the Rational Design of Functional Metallopolymers. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200800644] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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377
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Dzik WI, Smits JMM, Reek JNH, de Bruin B. Activation of Carbon Monoxide by (Me3tpa)Rh and (Me3tpa)Ir. Organometallics 2009. [DOI: 10.1021/om801142y] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wojciech I. Dzik
- Department of Homogeneous and Supramolecular Catalysis, Van’t Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institute for Molecules and Materials, Radboud Universiteit Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
| | - Jan M. M. Smits
- Department of Homogeneous and Supramolecular Catalysis, Van’t Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institute for Molecules and Materials, Radboud Universiteit Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
| | - Joost N. H. Reek
- Department of Homogeneous and Supramolecular Catalysis, Van’t Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institute for Molecules and Materials, Radboud Universiteit Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
| | - Bas de Bruin
- Department of Homogeneous and Supramolecular Catalysis, Van’t Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institute for Molecules and Materials, Radboud Universiteit Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
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378
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Mutti FG, Zoppellaro G, Gullotti M, Santagostini L, Pagliarin R, Andersson KK, Casella L. Biomimetic Modelling of Copper Enzymes: Synthesis, Characterization, EPR Analysis and Enantioselective Catalytic Oxidations by a New Chiral Trinuclear Copper(II) Complex. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200800899] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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379
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Bell CB, Calhoun JR, Bobyr E, Wei PP, Hedman B, Hodgson KO, DeGrado WF, Solomon EI. Spectroscopic definition of the biferrous and biferric sites in de novo designed four-helix bundle DFsc peptides: implications for O2 reactivity of binuclear non-heme iron enzymes. Biochemistry 2009; 48:59-73. [PMID: 19090676 PMCID: PMC2660568 DOI: 10.1021/bi8016087] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
DFsc is a single chain de novo designed four-helix bundle peptide that mimics the core protein fold and primary ligand set of various binuclear non-heme iron enzymes. DFsc and the E11D, Y51L, and Y18F single amino acid variants have been studied using a combination of near-IR circular dichroism (CD), magnetic circular dichroism (MCD), variable temperature variable field MCD (VTVH MCD), and X-ray absorption (XAS) spectroscopies. The biferrous sites are all weakly antiferromagnetically coupled with mu-1,3 carboxylate bridges and one 4-coordinate and one 5-coordinate Fe, very similar to the active site of class I ribonucleotide reductase (R2) providing open coordination positions on both irons for dioxygen to bridge. From perturbations of the MCD and VTVH MCD the iron proximal to Y51 can be assigned as the 4-coordinate center, and XAS results show that Y51 is not bound to this iron in the reduced state. The two open coordination positions on one iron in the biferrous state would become occupied by dioxygen and Y51 along the O(2) reaction coordinate. Subsequent binding of Y51 functions as an internal spectral probe of the O(2) reaction and as a proton source that would promote loss of H(2)O(2). Coordination by a ligand that functions as a proton source could be a structural mechanism used by natural binuclear iron enzymes to drive their reactions past peroxo biferric level intermediates.
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Affiliation(s)
- Caleb B. Bell
- Department of Chemistry, Stanford University, Stanford, California 94305
| | - Jennifer R. Calhoun
- Department of Biochemistry and Biophysics, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Elena Bobyr
- Department of Chemistry, Stanford University, Stanford, California 94305
- Stanford Synchrotron Radiation Laboratory, Stanford University, SLAC, Menlo Park, 94025
| | - Pin-pin Wei
- Department of Chemistry, Stanford University, Stanford, California 94305
| | - Britt Hedman
- Department of Chemistry, Stanford University, Stanford, California 94305
- Stanford Synchrotron Radiation Laboratory, Stanford University, SLAC, Menlo Park, 94025
| | - Keith O. Hodgson
- Department of Chemistry, Stanford University, Stanford, California 94305
- Stanford Synchrotron Radiation Laboratory, Stanford University, SLAC, Menlo Park, 94025
| | - William F. DeGrado
- Department of Biochemistry and Biophysics, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Edward I. Solomon
- Department of Chemistry, Stanford University, Stanford, California 94305
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380
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Pirngruber GD, Frunz L, Lüchinger M. The characterisation and catalytic properties of biomimetic metal–peptide complexes immobilised on mesoporous silica. Phys Chem Chem Phys 2009; 11:2928-38. [DOI: 10.1039/b819678h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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381
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Afanasiev P, Bouchu D, Kudrik EV, Millet JMM, Sorokin AB. Stable N-bridged diiron (IV) phthalocyanine cation radical complexes: synthesis and properties. Dalton Trans 2009:9828-36. [DOI: 10.1039/b916047g] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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382
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Coggins MK, Parker AM, Mangalum A, Galdamez GA, Smith RC. Dizinc Phosphohydrolase Model Built on am-Terphenyl Scaffold and Its Use in Indicator Displacement Assays for Pyrophosphate Under Physiological Conditions. European J Org Chem 2009. [DOI: 10.1002/ejoc.200800882] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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383
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Strautmann JBH, Freiherr von Richthofen CG, DeBeer George S, Bothe E, Bill E, Glaser T. Highly oxidized diiron complexes: generation, spectroscopy, and stabilities. Chem Commun (Camb) 2009:2637-9. [DOI: 10.1039/b903500a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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384
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Mayilmurugan R, Stoeckli-Evans H, Suresh E, Palaniandavar M. Chemoselective and biomimetic hydroxylation of hydrocarbons by non-heme μ-oxo-bridged diiron(iii) catalysts using m-CPBA as oxidant. Dalton Trans 2009:5101-14. [DOI: 10.1039/b820771b] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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385
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Visvaganesan K, Suresh E, Palaniandavar M. Highly selective hydroxylation of alkanes catalyzed by (μ-oxo)bis(μ-carboxylato)-bridged diiron(iii) complexes: involvement of mononuclear iron(iii) species in catalysis. Dalton Trans 2009:3814-23. [DOI: 10.1039/b901508f] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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386
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Botar B, Ellern A, Kögerler P. Acetate-controlled demetalation in multiiron polyoxometalates: A triiron cluster trapped between β- and γ-Keggin isomers. Dalton Trans 2009:5606-8. [DOI: 10.1039/b905211a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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387
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388
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İşci Ü, Afanasiev P, Millet JMM, Kudrik EV, Ahsen V, Sorokin AB. Preparation and characterization of μ-nitrido diiron phthalocyanines with electron-withdrawing substituents: application for catalytic aromatic oxidation. Dalton Trans 2009:7410-20. [DOI: 10.1039/b902592h] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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389
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Barats D, Leitus G, Popovitz-Biro R, Shimon L, Neumann R. A Stable “End-On” Iron(III)-Hydroperoxo Complex in Water Derived from a Multi-Iron(II)-Substituted Polyoxometalate and Molecular Oxygen. Angew Chem Int Ed Engl 2008; 47:9908-12. [DOI: 10.1002/anie.200803966] [Citation(s) in RCA: 42] [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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390
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Tejel C, Ciriano M, del Río M, Hetterscheid D, Tsichlis i Spithas N, Smits J, de Bruin B. Ligand Oxidation of a Deprotonated Bis(picolyl)amine IrI(cod) Complex. Chemistry 2008; 14:10932-6. [DOI: 10.1002/chem.200801162] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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391
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Barats D, Leitus G, Popovitz-Biro R, Shimon L, Neumann R. A Stable “End-On” Iron(III)-Hydroperoxo Complex in Water Derived from a Multi-Iron(II)-Substituted Polyoxometalate and Molecular Oxygen. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200803966] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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392
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Friedle S, Kodanko JJ, Fornace KL, Lippard SJ. 9-Triptycenecarboxylate-Bridged Diiron(II) Complexes: Capture of the Paddlewheel Geometric Isomer. J Mol Struct 2008; 890:317-327. [PMID: 19915653 PMCID: PMC2610540 DOI: 10.1016/j.molstruc.2008.05.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis and characterization of diiron(II) complexes supported by 9-triptycenecarboxylate ligands ((-)O(2)CTrp) is described. The interlocking nature of the triptycenecarboxylates facilitates formation of quadruply bridged diiron(II) complexes of the type [Fe(2)(μ-O(2)CTrp)(4)(L)(2)] (L = THF, pyridine or imidazole derivative) with a paddlewheel geometry. A systematic lengthening of the Fe-Fe distance occurs with the increase in steric bulk of the neutral donor L, resulting in values of up to 3 Å without disassembly of the paddlewheel structure. Reactions with an excess of water do not lead to decomposition of the diiron(II) core, indicating that these quadruply bridged complexes are of exceptional stability. The red-colored complexes [Fe(2)(μ-O(2)CTrp)(4)(4-AcPy)(2)] (10) and [Fe(2)(μ-O(2)CTrp)(4)(4-CNPy)(2)] (11) exhibit solvent-dependent thermochromism in coordinating solvents that was studied by variable temperature UV-vis spectroscopy. Reaction of [Fe(2)(μ-O(2)CTrp)(4)(THF)(2)] with N,N,N',N'-tetramethylethylenediamine (TMEDA), tetra-n-butyl ammonium thiocyanate, or excess 2-methylimidazole resulted in the formation of mononuclear complexes [Fe(O(2)CTrp)(2)(TMEDA)] (13), (n-Bu(4)N)(2)[Fe(O(2)CTrp)(2)(SCN)(2)] (14), and [Fe(O(2)CTrp)(2)(2-MeIm)(2)] (15) having an O(4)/N(2) coordination sphere composition.
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Affiliation(s)
- Simone Friedle
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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393
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Kunishita A, Kubo M, Ishimaru H, Ogura T, Sugimoto H, Itoh S. H2O2-Reactivity of Copper(II) Complexes Supported by Tris[(pyridin-2-yl)methyl]amine Ligands with 6-Phenyl Substituents. Inorg Chem 2008; 47:12032-9. [DOI: 10.1021/ic801568g] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Atsushi Kunishita
- Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan, Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan, and Research Institute of Picobiology, Graduate School of Life
| | - Minoru Kubo
- Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan, Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan, and Research Institute of Picobiology, Graduate School of Life
| | - Hirohito Ishimaru
- Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan, Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan, and Research Institute of Picobiology, Graduate School of Life
| | - Takashi Ogura
- Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan, Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan, and Research Institute of Picobiology, Graduate School of Life
| | - Hideki Sugimoto
- Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan, Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan, and Research Institute of Picobiology, Graduate School of Life
| | - Shinobu Itoh
- Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan, Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan, and Research Institute of Picobiology, Graduate School of Life
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394
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Sun H, Wang M, Li F, Li P, Zhao Z, Sun L. Synthesis and structure of a µ-oxo diiron(III) complex with anN-pyridylmethyl-N,N-bis(4-methylbenzimidazol-2-yl)amine ligand and its catalytic property for hydrocarbon oxidation. Appl Organomet Chem 2008. [DOI: 10.1002/aoc.1444] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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395
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Sedinkin SL, Rath NP, Bauer EB. Synthesis and structural characterization of new phosphinooxazoline complexes of iron. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2008.06.031] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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396
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Mononuclear and binuclear iron(III) complexes incorporating N4O3 coordinating heptadentate ligand: Synthesis, structure and magnetic properties. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.05.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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397
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Park BK, Jang KH, Kim PG, Kim C, Kim Y. Tetra-μ-benzoato-bis-[(3-methyl-quinoline)copper(II)](Cu-Cu). Acta Crystallogr Sect E Struct Rep Online 2008; 64:m1141. [PMID: 21201597 PMCID: PMC2960550 DOI: 10.1107/s1600536808024859] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2008] [Accepted: 08/02/2008] [Indexed: 11/29/2022]
Abstract
In the title compound, [Cu2(C7H5O2)4(C10H9N)2], the paddle-wheel-type dinuclear complex molecule contains four bridging benzoate groups and two terminal 3-methylquinoline ligands. The asymmetric unit contains one and a half molecules with a total of three independent Cu atoms; there is an inversion center at the mid-point of the Cu⋯Cu bond in one molecule. The octahedral coordination of each Cu atom, with four O atoms in the equatorial plane, is completed by an N atom of a 3-methylquinoline ligand [Cu—N = 2.190 (4)–2.203 (3) Å] and by another Cu atom [Cu⋯Cu = 2.667 (1) and 2.6703 (7) Å]. The Cu atoms are all ca 0.22 Å out of the plane of the four bonded O atoms.
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398
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Iron(III) complexes of the tris-(3-aminopropyl) derivative of a 14-membered tetraazamacrocycle: Potentiometric, spectroscopic and electrochemical studies. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.04.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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399
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Kudrik E, Sorokin A. N-Bridged Diiron Phthalocyanine Catalyzes Oxidation of Benzene with H2O2via Benzene Oxide with NIH Shift Evidenced by Using 1,3,5-[D3]Benzene as a Probe. Chemistry 2008; 14:7123-6. [DOI: 10.1002/chem.200800504] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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400
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Duban EA, Brylyakov KP, Talsi EP. The nature of active species in catalytic systems based on non-heme iron complexes, hydrogen peroxide, and acetic acid for selective olefin epoxidation. KINETICS AND CATALYSIS 2008. [DOI: 10.1134/s0023158408030099] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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