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Sugimoto H, Sugimoto K. New bis(pyranodithiolene) tungsten(IV) and (VI) complexes as chemical analogues of the active sites of tungsten enzymes. INORG CHEM COMMUN 2008. [DOI: 10.1016/j.inoche.2007.10.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Reactivity of tetrathiometalates with alkynes. Synthesis and characterisation of dithiolene complexes of Mo, W, and V by ESMS and XRD. TRANSIT METAL CHEM 2007. [DOI: 10.1007/s11243-007-9005-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Sugimoto H, Tarumizu M, Miyake H, Tsukube H. Synthesis and Characterization of Bis(dithiolene) Tungsten(VI), -(V), and -(IV) Complexes and Their Reactivities in Coupled Electron–Proton Transfer: A New Series of Active Site Models of Tungstoenzymes. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200700602] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Zhang Q, Starke K, Schulzke C, Hofmeister A, Magull J. Different reaction behaviour of molybdenum and tungsten – Reactions of the dichloro dioxo dimethyl-bispyridine complexes with thiophenolate. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2007.04.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Nomura M, Sakaki S, Fujita-Takayama C, Hoshino Y, Kajitani M. Formations and electrochemical behavior of mononuclear and binuclear molybdenum dithiolene complexes with nitrosyl ligands: Evidence for the formation of a coordinatively unsaturated species [Cp∗Mo(NO)(dithiolene)]. J Organomet Chem 2006. [DOI: 10.1016/j.jorganchem.2006.04.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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56
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Nomura M, Kajitani M. Formations and structures of cobalt dithiolene complexes with nitrogen group-substituted cyclopentadienyl ligands. J Organomet Chem 2006. [DOI: 10.1016/j.jorganchem.2006.02.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sugimoto H, Tajima R, Sakurai T, Ohi H, Miyake H, Itoh S, Tsukube H. Reversible Sulfurization–Desulfurization of Tungsten Bis(dithiolene) Complexes. Angew Chem Int Ed Engl 2006; 45:3520-2. [PMID: 16634103 DOI: 10.1002/anie.200600640] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hideki Sugimoto
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan.
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Sugimoto H, Tajima R, Sakurai T, Ohi H, Miyake H, Itoh S, Tsukube H. Reversible Sulfurization–Desulfurization of Tungsten Bis(dithiolene) Complexes. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200600640] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ma X, Starke K, Schulzke C, Schmidt H, Noltemeyer M. Structural, Electrochemical, and Theoretical Investigations of New Thio‐ and Selenoether Complexes of Molybdenum and Tungsten. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200500698] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xiaoli Ma
- Institut f. Anorganische Chemie, Universität Göttingen, Tammannstr. 4, 37077 Göttingen, Germany, Fax: +49‐551‐393373
| | - Kerstin Starke
- Institut f. Anorganische Chemie, Universität Göttingen, Tammannstr. 4, 37077 Göttingen, Germany, Fax: +49‐551‐393373
| | - Carola Schulzke
- Institut f. Anorganische Chemie, Universität Göttingen, Tammannstr. 4, 37077 Göttingen, Germany, Fax: +49‐551‐393373
| | - Hans‐Georg Schmidt
- Institut f. Anorganische Chemie, Universität Göttingen, Tammannstr. 4, 37077 Göttingen, Germany, Fax: +49‐551‐393373
| | - Mathias Noltemeyer
- Institut f. Anorganische Chemie, Universität Göttingen, Tammannstr. 4, 37077 Göttingen, Germany, Fax: +49‐551‐393373
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Cervilla A, Pérez-Pla F, Llopis E, Piles M. Reduction of Tris(benzene-1,2-dithiolate)molybdenum(VI) by Water. A Functional Mo−Hydroxylase Analogue System. Inorg Chem 2005; 44:4106-8. [PMID: 15934728 DOI: 10.1021/ic0483242] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mo(VI)(S(2)C(6)H(4))(3) reacts cleanly and completely with H(2)O in THF to afford [H(3)O](+)[Mo(V)(S(2)C(6)H(4))(3)](-). Kinetic data were fit by the rate equation -d[Mo(VI)(S(2)C(6)H(4))(3)]/dt = k[Mo(VI)(S(2)C(6)H(4))(3)]/[H(3)O(+)], which is consistent with a coupled electron-proton transfer mechanism involving a coordinated H(2)O molecule. The Mo(VI)(S(2)C(6)H(4))(3) reduction is accelerated by the presence of PPh(3) and affords OPPh(3). (18)O isotope tracing shows that H(2)O is the source of oxygen transferred to PPh(3).
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Affiliation(s)
- Antonio Cervilla
- ICMUV, P.O. Box 2085, Polígono La Coma, Paterna, Valencia 46071, Spain.
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Schulzke C. Temperature dependent electrochemical investigations of molybdenum and tungsten oxobisdithiolene complexes. Dalton Trans 2005:713-20. [PMID: 15702182 DOI: 10.1039/b414853c] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To achieve a better understanding why thermophilic and hyperthermophilic organisms use tungsten instead of molybdenum within the active sites of their molybdopterin dependent oxidases, electrochemical investigations of model complexes for the active sites of enzymes belonging to the DMSO reductase (molybdenum) and the aldehyde oxidoreductase (tungsten) family have been undertaken. Cyclic voltammetry and differential pulse voltammetry of four pairs of molybdenum and tungsten oxobisdithiolene compounds show huge differences in the response of their redox potentials to rising or decreasing temperatures, depending on the substituents at the dithiolene group. The mnt2- compounds (1a, 1b) respond with decreasing redox potentials E(1/2) to rising temperatures whereas all other compounds show positive gradients deltaE/deltaT. In every case the values for the gradients for the tungsten compounds are greater than those for the molybdenum compounds. Six of the investigated compounds are known in the literature and two compounds were newly synthesized. These two new compounds include the pyrane subunit of the native molybdopterin ligand and should therefore be even better models for the active site of the molybdopterin containing enzymes. The molybdenum/tungsten pair with these new ligands shows a remarkably small difference for the redox potentials of the transition M(IV) <--> M(V) of only 30 mV at 25 degrees C and the reversion of the usual order with higher potentials for the molybdenum than the tungsten compound at a temperature of 70 degrees C; a temperature that is in the range where usually tungsten containing enzymes instead of molybdenum containing ones are found.
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Affiliation(s)
- Carola Schulzke
- Institut für Anorganische Chemie, Universität Göttingen, 37077 Göttingen, Germany.
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Wong YL, Cowley AR, Dilworth JR. Synthesis, structures, electrochemistry and properties of dioxo-molybdenum(VI) and -tungsten(VI) complexes with novel asymmetric N2OS, and partially symmetric N2S2, NOS2 N-capped tripodal ligands. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.07.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Zhang W, Behrens A, Gätjens J, Ebel M, Wu X, Rehder D. Tri- and Pentanuclear Tungsten-(μ-S)-M Clusters (M = W, Cu, Ag). Inorg Chem 2004; 43:3020-3. [PMID: 15106993 DOI: 10.1021/ic0302783] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The thiotungstate [Et4N]2[OW(WS4)2], [Et4N]2.1, containing the linear [[S2W(VI)(mu-S)2]2W(IV)=O] core, was prepared from [Et4N]2[WS4] in the presence of the sulfide scavenger Cd2+. Addition of 1,2-bis(o-diphenylphosphinophenyl)ethane (diphosphine) and Cu+ or Ag+ to solutions of 1 in MeCN/DMF led to coordination of the (diphosphine)Cu/Ag fragments to the terminal sulfido ligands of 1, yielding novel linear pentanuclear, heterometallic clusters [mu-[OW(IV)(DMF)(W(VI)S4)2][M(diphosphine)]2], 2 (M = Cu) and 3 (M = Ag). Along with 2, the trinuclear cluster [[mu-(W(VI)S4)[Cu(diphosphine)(2)]], 4, was also obtained. The molecular and crystal structures of [Et4N]2.1, 2.MeCN, 3.MeCN, and 4.2MeCN.CH2Cl2 have been determined.
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Affiliation(s)
- Wenjian Zhang
- Institute of Inorganic and Applied Chemistry, University of Hamburg, D-20146 Hamburg, Germany
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Cervilla A, Pérez-Plá F, Llopis E, Piles M. The reduction of tris-dithiolene complexes of molybdenum(vi) and tungsten(vi) by hydroxide ion: kinetics and mechanism. Dalton Trans 2004:1461-5. [PMID: 15252642 DOI: 10.1039/b402234c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The kinetic study of the spontaneous reduction of some neutral tris-dithiolene complexes [ML3] of molybdenum(VI) and tungsten(VI), (L = S2C6H4(2-), S2C6H3CH3(2-) and S2C2(CH3)2(2-); M = Mo or W) by tetrabutylammonium hydroxide in tetrahydrofuran-water solutions demonstrates that OH- is an effective reductant. Their reduction is fast, clean and quantitative. Depending upon both the molar ratio in which the reagents are mixed and the amount of water present, one- or two-electron reductions of these tris-dithiolene complexes were observed. If Bu4NOH is present in low concentration or/and at high concentrations of water, the total transformation of the neutral M(VI) complex into the monoanionic M(V) complex is the only observed process. Stopped-flow kinetic data for this reaction are consistent with the rate law: -d[ML3]/dt = d[ML3-]/dt = k[ML3][Bu4NOH]. The proposed mechanism involves nucleophilic attack of OH- to form a mono-anionic seven-coordinate intermediate [ML3OH]-, which interacts with another molecule of [ML3] to generate the monoanionic complex [ML3]- transfering the oxygen from coordinated OH- to water. Hydrogen peroxide was identified as the reaction product. The molybdenum complexes are more difficult to reduce than their corresponding tungsten complexes, and the values of k obtained for the molybdenum and tungsten series of complexes increase as the ene-1,2-dithiolate ligand becomes more electron-withdrawing (S2C6H4(2-) > S2C6H3CH3(2-) > S2C2(CH3)2(2-)). This investigation constitutes the only well-established interaction between hydroxide ion and a tris(dithiolene) complex, and supports a highly covalent bonding interaction between the metal and the hydroxide ion that modulates electron transfer reactions within these complexes.
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Affiliation(s)
- Antonio Cervilla
- Instituto de Ciencia de los Materiales de la Universidad de Valencia (ICMUV), PO Box 2085, Poligono La Coma, Paterna, Valencia, Spain.
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Enemark JH, Cooney JJA, Wang JJ, Holm RH. Synthetic Analogues and Reaction Systems Relevant to the Molybdenum and Tungsten Oxotransferases. Chem Rev 2003; 104:1175-200. [PMID: 14871153 DOI: 10.1021/cr020609d] [Citation(s) in RCA: 424] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- John H Enemark
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA
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67
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Maiti R, Nagarajan K, Sarkar S. Synthesis and structure of [L][MoIVO(mnt)2] {L=[(C2H5)4N]+, [C5H5NH]+, [(C2H5)3NH]+, [lysinium]2+ and (mnt2−=1,2-dicyanoethylenedithiolate)} in relevance to molybdenum cofactor of diverse class of molybdoenzymes. J Mol Struct 2003. [DOI: 10.1016/s0022-2860(03)00336-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Affiliation(s)
- Martin Kaupp
- Institut für Anorganische Chemie Universität Würzburg Am Hubland, 97074 Würzburg, Germany, Fax: (+49) 931‐888‐7135
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Abstract
Under certain circumstances, metal complexes with a formal d(0) electronic configuration may exhibit structures that violate the traditional structure models, such as the VSEPR concept or simple ionic pictures. Some examples of such behavior, such as the bent gas-phase structures of some alkaline earth dihalides, or the trigonal prismatic coordination of some early transition metal chalcogenides or pnictides, have been known for a long time. However, the number of molecular examples for "non-VSEPR" structures has increased dramatically during the past decade, in particular in the realm of organometallic chemistry. At the same time, various theoretical models have been discussed, sometimes controversially, to explain the observed, unusual structures. Many d(0) systems are important in homogeneous and heterogeneous catalysis, biocatalysis (e.g. molybdenum or tungsten enzymes), or materials science (e.g. ferroelectric perovskites or zirconia). Moreover, their electronic structure without formally nonbonding d orbitals makes them unique starting points for a general understanding of structure, bonding, and reactivity of transition metal compounds. Here we attempt to provide a comprehensive view, both of the types of deviations of d(0) and related complexes from regular coordination arrangements, and of the theoretical framework that allows their rationalization. Many computational and experimental examples are provided, with an emphasis on homoleptic mononuclear complexes. Then the factors that control the structures are discussed in detail. They are a) metal d orbital participation in sigma bonding, b) polarization of the outermost core shells, c) ligand repulsion, and d) pi bonding. Suggestions are made as to which of the factors are the dominant ones in certain situations. In heteroleptic complexes, the competition of sigma and pi bonding of the various ligands controls the structures in a complicated fashion. Some guidelines are provided that should help to better understand the interrelations. Bent's rule is of only very limited use in these types of systems, because of the paramount influence of pi bonding. Finally, computed and measured structures of multinuclear complexes are discussed, including possible consequences for the properties of bulk solids.
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Affiliation(s)
- Martin Kaupp
- Institut für Anorganische Chemie Universität Würzburg Am Hubland, 97074 Würzburg (Germany)
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Thapper A, Balmes O, Lorber C, Svensson PH, Holm R, Nordlander E. Synthesis and structural characterization of two tungsten(VI) dioxo complexes with N,O- and N,S-coordinating ligands. Inorganica Chim Acta 2001. [DOI: 10.1016/s0020-1693(01)00509-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Balakrishnarajan MM, Jemmis ED, Gupta S, Mazumdar S, Mukherjee P, Machonkin T, Dubois JL, Cole AP, Hedman B, Hodgson KO, Solomon EI, Stack TDP, Roesky HW, Manoharan PT, Baitalik S, Nag K, Sarkar S, Seshadri R, Felser C, Nixon JF, Katti KV, Pillarsetty N, Kamei H, Bora U, Chaudhuri MK, Dhar SS, Kalita D, Anand BN, Ramanan A, Roy P, Duraisamy T, Sharma S, Ayyappan P, Gupta BD, Kanth VV, Singh V, Suresh E, Boopalan K, Jasra RV, Bhadbhade MM, Naganagowda GA, Ramanathan KV, Gayathri V, Nanjegowda NM, Sengupta P, Ghosh S, Bhattacharjee M, Gupta SS, Datta R, Sastri CV, Easwaramoorthy D, Lakshmi A, Giribabu L, Maiya BG, Reddy PR, Radhika M, Nightingale KF, Srinivasan R, Venkatesan R, Rajendiran TM, Sambasiva Rao P, Bhavana P, Bhyrappa P, Ravikanth M, Kumaraswamy S, Kommana P, Padmaja G, Kumara Swamy KC, Mondal B, Chakraborty S, Lahiri GK, Ray M, Que L, Saxena A, Sampriya N, Brar AS, Shankar R, Sahoo BB, Panday G, Wasthi AA, Chauhan SMS, Wadhwani P, Bandyopadhyay DK, Bandyopadhyay R, Biswas S, Bhattacharyya R, Johis V, Kotkar D, Pathak VS, Swayambhunathan V, Kamat P, Das A, Ghosh PK, Gupta R, Mukherjee R, Walawalkar MG, Pal SK, Krishnan A, Samuelson AG, Das PK, Anantharaman G, Baheti K, Murugavel R, Garg G, Ganguli AK, Suresh M, Prasadarao AV, Neeraj S, Natarajan S, Rao CNR, Vanitha PV, Santhosh PN, Rao CNR, Kumar GG, Munichandraiah N, Ramakrishna TVV, Elias AJ, Vij A, Rajak KK, Rath SP, Dutta S, Bhattacharya PK, Natarajan P, Paul P, Dhanasekaran T, Prakash H, Mangayarkarasi N, Zacharias PS, Srinivasan A, Pushpan SK, Anand VG, Chandrashekar TK, Tripathi P, Som A, Bharadwaj PK, Mathew N, Jagirdar BR, Mandal SK, Naganagowda GA, Krishnamurthy SS, Singh UP, Singh R, Hikichi S, Moro-Oka Y, Sevagapandian S, Nehru K, Athappan PR, Murali M, Palaniandavar M, Singh RB, Mitra S, Reddy PAN, Datta R, Chakravarty AR, Sunkari S, Rajasekharan MV, Shukla AD, Bajaj HC, Das A, Krishnamurthy D, Sathiyendiran M, Murugavel R, Rao KM, Boag NM, Neogi DN, Bhawmick R, Bandyopadhyay P, Thomas AM, Mandal GC, Tiwary SK, Chakravarty AR, Sah AK, Das TM, Wegelius EK, Kolehmainen E, Saarenketo PK, Rissanen K, Rao CP, Warad DU, Satish CD, Bajgur CS, Manonmani J, Narayanan V, Kandaswamy M, Kingston JV, Sundaram GSM, Rao MNS, Rajendiran TM, Kannappan R, Venkatesan R, Rao PS, Bilakhiya AK, Tyagi B, Paul P, Dhar SD, Chaudhuri MK, Ghosh T, Banerjee R, Kureshy RI, Khan NH, Abdi SHR, Patel ST, Iyer P, Jasra RV, Chatterjee D, Mitra A, Mukherjee S, Ganesan V, Ramaraj R, Shunmugasundari T, Thanasekaran P, Rajagopal S, Bohra R, Sharma N, Nagar S, Panda R, Balakrishna MS, Vaidhyanathan R, Natarajan S, Rao CNR, Choudhury A, Natarajan S, Rao CNR, Chakrabarty D, Mahapatra S, Devi MS, Vidyasagar K, Mody HM, Pandya P, Bhatt P, Jasra RV, Padmanabhan M, Mathew T, Shukla AD, Dave PC, Suresh E, Pathak G, Das A, Dastidar P, Mahalakshmi L, Krishnamurthy SS, Nethaji M, Rath N, Mathew N, Jagirdhar B, Gopalan RS, Kulkarni GU, Sridevi S, Narayanan J, Chandrashekar TK, Saha A, Ghosh AK, Majumdar P, Goswami S, Abhyankar RM, Balakrishna MS, Basuli F, Bhattacharya S, Mondal N, Saha MK, Bag B, Mitra S, Pal S, Sangeetha NR, Pal S, Dey M, Saarenketo PK, Kolehmainen E, Rissanen K, Rao CP, Suresh E, Bhadbhade MM, Padmakumar K, Manoharan PT, Vernekar B, Srinivasan BR, Ramesh K, Bharathi DS, Samuelson AG, Lokanath NK, Shridhar MA, Prasad S, Venkatraman NV, Vasudevan S, Mimani T, Patil KC, Tiwari AP, Mukkada BJ, Arunan E, Mathias PC, Abraham B, Karthikeyan B, Pal SK, Samuelson AG, Umapathy S, Panda PK, Krishnan V. Abstract. J CHEM SCI 2000. [DOI: 10.1007/bf02706182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Thapper A, Lorber C, Fryxelius J, Behrens A, Nordlander E. Synthesis and reactivity studies of model complexes for molybdopterin-dependent enzymes. J Inorg Biochem 2000; 79:67-74. [PMID: 10830849 DOI: 10.1016/s0162-0134(00)00010-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The molybdenum cofactor (Moco)-containing enzymes are divided into three classes that are named after prototypical members of each family, viz. sulfite oxidase, DMSO reductase and xanthine oxidase. Functional or structural models have been prepared for these three prototypical enzymes: (i) The complex [MoO2(mnt)2]2- (mnt2- = 1,2-dicyanoethylenedithiolate) has been found to be able to oxidize hydrogen sulfite to HSO4- and is thus a functional model of sulfite oxidase. Kinetic and computational studies indicate that the reaction proceeds via attack of the substrate at one of the oxo ligands of the complex, rather than at the metal. (ii) The coordination geometries of the mono-oxo [Mo(VI)(O-Ser)(S2)2] entity (S2 = dithiolene moiety of molybdopterin) found in the crystal structure of R. sphaeroides DMSO reductase and the corresponding des-oxo Mo(IV) unit have been reproduced in the complexes [M(VI)O(OSiR3)(bdt)2] and [M(VI)O(OSiR3)(bdt)2] (M = Mo,W; bdt = benzene dithiolate). (iii) A facile route has been developed for the preparation of complexes containing a cis-Mo(VI)OS molybdenum oxo, sulfido moiety similar to that detected in the oxidized form of xanthine oxidase.
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Affiliation(s)
- A Thapper
- Chemical Center, Lund University, Sweden
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Sung KM, Holm RH. Synthesis and structures of bis(dithiolene)-tungsten(IV) complexes related to the active sites of tungstoenzymes. Inorg Chem 2000; 39:1275-81. [PMID: 12526419 DOI: 10.1021/ic991153u] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Recent protein crystallographic results on tungsten enzymes and primary sequence relationships between certain molybdenum and tungsten enzymes provoke interest in the generalized bis(dithiolene) complexes [WIV(QR)(S2C2R'2)2]1- and [WVIO(QR)(S2C2R'2)2]1- (Q = O, S, Se) as minimal representations of enzyme sites. The existence and stability of W(IV) complexes have been explored by synthesis. Reaction of [W(CO)2(S2C2Me2)2] (1) with PhO- results in complete CO substitution to give [W(OPh)(S2C2Me2)2]1- (2). Reaction of 1 with PhQ- affords the monocarbonyls [W(CO)(QPh)(S2C2Me2)2]1- (Q = S (3), Se (5)). The use of sterically demanding 2,4,6-Pri3C6H2Q- also yields monocarbonyls, [W(CO)(QC6H2-2,4,6-Pri3)(S2C2Me2)2]1- (Q = S (4), Se (6)). The X-ray structures of square pyramidal 2 and trigonal prismatic 3-6 (with unidentate ligands cis) are described. The tendency to substitute one or both carbonyl ligands in 1 in the formation of [MIV(QAr)(S2C2Me2)2]1- and [MIV(CO)(QAr)(SeC2Me2)2]1- with M = Mo and W is related to the M-Q bond length and ligand steric demands. The results demonstrate a stronger binding of CO by W(IV) than Mo(IV), a behavior previously demonstrated by thermodynamic and kinetic features of zerovalent carbonyl complexes. Complexes 3-6 can be reversibly reduced to W(III) at approximately -1.5 V versus SCE. On the basis of the potential for 2(-2.07 V), monocarbonyl ligation stabilizes W(III) by approximately 500 mV. This work is part of a parallel investigation of the chemistry of bis(dithiolene)-molybdenum (Lim, B. S.; Donahue, J. P.; Holm, R. H. Inorg. Chem. 2000, 39, 263) and -tungsten complexes related to enzyme active sites.
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Affiliation(s)
- K M Sung
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
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Oku H, Ueyama N, Nakamura A. Dioxomolybdenum(VI) and Dioxotungsten(VI) Structure with Mono(Dithiolato) Coordination: Crystal Structures, Properties and Reactivity of [{MVIO2(dithiolato)}2(μ-O)]2−(M = Mo and W) Complexes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1999. [DOI: 10.1246/bcsj.72.2261] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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76
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Wang K, McConnachie JM, Stiefel EI. Syntheses of Metal Dithiolene Complexes from Thiometalates by Induced Internal Redox Reactions. Inorg Chem 1999. [DOI: 10.1021/ic990204k] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kun Wang
- Corporate Research Laboratories, Exxon Research and Engineering Company, Route 22 East, Clinton Township, Annandale, New Jersey 08801
| | - Jonathan M. McConnachie
- Corporate Research Laboratories, Exxon Research and Engineering Company, Route 22 East, Clinton Township, Annandale, New Jersey 08801
| | - Edward I. Stiefel
- Corporate Research Laboratories, Exxon Research and Engineering Company, Route 22 East, Clinton Township, Annandale, New Jersey 08801
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77
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Eagle AA, George GN, Tiekink ER, Young CG. Generation and biomimetic chemistry of tungsten-dithiolene complexes containing the hydrotris(3,5-dimethylpyrazol-1-yl)borate ligand. J Inorg Biochem 1999; 76:39-45. [PMID: 10530005 DOI: 10.1016/s0162-0134(99)00106-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Reactions of bis(thio)-W(VI) complexes, LWS2X (L = hydrotris (3,5-dimethylpyrazol-1-yl)borate, X = monoanion), with alkynes produce dithiolene complexes, LWX(dithiolene). The synthesis and characterization of orange LW(OPh){S2C2(CO2Me)2} (1) and burgundyred LW(SePh) {S2C2(Ph)(2-quinoxalinyl)} (2) and the X-ray crystal structure of 1.0.5CH2Cl2, are described in detail. Crystals of 1.0.5CH2Cl2 are orthorhombic, space group Pbcn, with a = 29.826(6), b = 13.291(4), c = 16.078(4) A, V = 6373(5) A3, and Z = 8. The six-coordinate, distorted-octahedral complex features a tridentate L ligand, a monodentate phenoxide ligand, and a bidentate dithiolene ligand. The short W-S bonds (2.267(4) and 2.279(4) A) and the parameters associated with the phenoxide ligand (W-O = 1.850(8) A, W-O-C = 146(1) degree), point to a considerable degree of W-ligand multiple bonding in the [W(OPh)(dithiolene)]+ unit. For 2, W-Se and average W-S distances of 2.49(2) A and 2.30(2) A, respectively, have been obtained from EXAFS studies. The formation of yellow 3,3'-dithiobis[2-(phenyl)thieno[2,3-b]quinoxaline] (3) upon oxidation of 2 supports the likely generation of urothione upon oxidative degradation of molybdopterin-containing tungsten enzymes from hyperthermophilic organisms.
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Affiliation(s)
- A A Eagle
- School of Chemistry, University of Melbourne, Parkville, Vic., Australia
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78
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Wong YL, Ma JF, Law WF, Yan Y, Wong WT, Zhang ZY, Mak TCW, Ng DKP. Synthesis, Electrochemistry, and Oxygen-Atom Transfer Reactions of Dioxotungsten(VI) and -molybdenum(VI) Complexes with N2O2 and N2S2 Tetradentate Ligands. Eur J Inorg Chem 1999. [DOI: 10.1002/(sici)1099-0682(19990202)1999:2<313::aid-ejic313>3.0.co;2-z] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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79
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Dias JM, Than ME, Humm A, Huber R, Bourenkov GP, Bartunik HD, Bursakov S, Calvete J, Caldeira J, Carneiro C, Moura JJ, Moura I, Romão MJ. Crystal structure of the first dissimilatory nitrate reductase at 1.9 A solved by MAD methods. Structure 1999; 7:65-79. [PMID: 10368307 DOI: 10.1016/s0969-2126(99)80010-0] [Citation(s) in RCA: 248] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
BACKGROUND The periplasmic nitrate reductase (NAP) from the sulphate reducing bacterium Desulfovibrio desulfuricans ATCC 27774 is induced by growth on nitrate and catalyses the reduction of nitrate to nitrite for respiration. NAP is a molybdenum-containing enzyme with one bis-molybdopterin guanine dinucleotide (MGD) cofactor and one [4Fe-4S] cluster in a single polypeptide chain of 723 amino acid residues. To date, there is no crystal structure of a nitrate reductase. RESULTS The first crystal structure of a dissimilatory (respiratory) nitrate reductase was determined at 1.9 A resolution by multiwavelength anomalous diffraction (MAD) methods. The structure is folded into four domains with an alpha/beta-type topology and all four domains are involved in cofactor binding. The [4Fe-4S] centre is located near the periphery of the molecule, whereas the MGD cofactor extends across the interior of the molecule interacting with residues from all four domains. The molybdenum atom is located at the bottom of a 15 A deep crevice, and is positioned 12 A from the [4Fe-4S] cluster. The structure of NAP reveals the details of the catalytic molybdenum site, which is coordinated to two MGD cofactors, Cys140, and a water/hydroxo ligand. A facile electron-transfer pathway through bonds connects the molybdenum and the [4Fe-4S] cluster. CONCLUSIONS The polypeptide fold of NAP and the arrangement of the cofactors is related to that of Escherichia coli formate dehydrogenase (FDH) and distantly resembles dimethylsulphoxide reductase. The close structural homology of NAP and FDH shows how small changes in the vicinity of the molybdenum catalytic site are sufficient for the substrate specificity.
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Affiliation(s)
- J M Dias
- Departamento de Quimica, CQFB, FCT, Universidade Nova de Lisboa, Caparica, Portugal
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80
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Donahue JP, Goldsmith CR, Nadiminti U, Holm RH. Synthesis, Structures, and Reactivity of Bis(dithiolene)molybdenum(IV,VI) Complexes Related to the Active Sites of Molybdoenzymes. J Am Chem Soc 1998. [DOI: 10.1021/ja982914f] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James P. Donahue
- Contribution from the Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Christian R. Goldsmith
- Contribution from the Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Uma Nadiminti
- Contribution from the Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| | - R. H. Holm
- Contribution from the Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
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81
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Lorber C, Donahue JP, Goddard CA, Nordlander E, Holm RH. Synthesis, Structures, and Oxo Transfer Reactivity of Bis(dithiolene)tungsten(IV,VI) Complexes Related to the Active Sites of Tungstoenzymes. J Am Chem Soc 1998. [DOI: 10.1021/ja981015o] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christian Lorber
- Contribution from the Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Inorganic Chemistry I, Chemical Center, Lund University, S-2210 Lund, Sweden
| | - James P. Donahue
- Contribution from the Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Inorganic Chemistry I, Chemical Center, Lund University, S-2210 Lund, Sweden
| | - Christine A. Goddard
- Contribution from the Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Inorganic Chemistry I, Chemical Center, Lund University, S-2210 Lund, Sweden
| | - Ebbe Nordlander
- Contribution from the Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Inorganic Chemistry I, Chemical Center, Lund University, S-2210 Lund, Sweden
| | - R. H. Holm
- Contribution from the Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Inorganic Chemistry I, Chemical Center, Lund University, S-2210 Lund, Sweden
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82
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83
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Donahue JP, Lorber C, Nordlander E, Holm RH. Molybdenum and Tungsten Structural Analogues of the Active Sites of the MoIV + [O] → MoVIO Oxygen Atom Transfer Couple of DMSO Reductases. J Am Chem Soc 1998. [DOI: 10.1021/ja973917f] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James P. Donahue
- Department of Chemistry and Chemical Biology Harvard University, Cambridge, Massachusetts 02138 Inorganic Chemistry 1, Chemical Center Lund University, S-22100 Lund, Sweden
| | - Christian Lorber
- Department of Chemistry and Chemical Biology Harvard University, Cambridge, Massachusetts 02138 Inorganic Chemistry 1, Chemical Center Lund University, S-22100 Lund, Sweden
| | - Ebbe Nordlander
- Department of Chemistry and Chemical Biology Harvard University, Cambridge, Massachusetts 02138 Inorganic Chemistry 1, Chemical Center Lund University, S-22100 Lund, Sweden
| | - R. H. Holm
- Department of Chemistry and Chemical Biology Harvard University, Cambridge, Massachusetts 02138 Inorganic Chemistry 1, Chemical Center Lund University, S-22100 Lund, Sweden
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84
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Tucci GC, Donahue JP, Holm RH. Comparative Kinetics of Oxo Transfer to Substrate Mediated by Bis(dithiolene)dioxomolybdenum and -tungsten Complexes. Inorg Chem 1998. [DOI: 10.1021/ic971426q] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gregory C. Tucci
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| | - James P. Donahue
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| | - R. H. Holm
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
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85
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86
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Eagle AA, Tiekink ERT, Young CG. Dioxotungsten(VI) Complexes of Hydrotris(3,5-dimethylpyrazol-1-yl)borate Including the X-ray Crystal Structure of the Tungsten Selenophenolate Complex cis-{HB(Me2C3N2H)3}WO2(SePh). Inorg Chem 1997. [DOI: 10.1021/ic970544a] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aston A. Eagle
- School of Chemistry, University of Melbourne, Parkville, Victoria 3052, Australia, and Department of Chemistry, University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Edward R. T. Tiekink
- School of Chemistry, University of Melbourne, Parkville, Victoria 3052, Australia, and Department of Chemistry, University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Charles G. Young
- School of Chemistry, University of Melbourne, Parkville, Victoria 3052, Australia, and Department of Chemistry, University of Adelaide, Adelaide, South Australia 5005, Australia
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87
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Boyington JC, Gladyshev VN, Khangulov SV, Stadtman TC, Sun PD. Crystal structure of formate dehydrogenase H: catalysis involving Mo, molybdopterin, selenocysteine, and an Fe4S4 cluster. Science 1997; 275:1305-8. [PMID: 9036855 DOI: 10.1126/science.275.5304.1305] [Citation(s) in RCA: 408] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Formate dehydrogenase H from Escherichia coli contains selenocysteine (SeCys), molybdenum, two molybdopterin guanine dinucleotide (MGD) cofactors, and an Fe4S4 cluster at the active site and catalyzes the two-electron oxidation of formate to carbon dioxide. The crystal structures of the oxidized [Mo(VI), Fe4S4(ox)] form of formate dehydrogenase H (with and without bound inhibitor) and the reduced [Mo(IV), Fe4S4(red)] form have been determined, revealing a four-domain alphabeta structure with the molybdenum directly coordinated to selenium and both MGD cofactors. These structures suggest a reaction mechanism that directly involves SeCys140 and His141 in proton abstraction and the molybdenum, molybdopterin, Lys44, and the Fe4S4 cluster in electron transfer.
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Affiliation(s)
- J C Boyington
- Laboratory of Molecular Structure, National Institute of Allergy and Infectious Diseases, National Institutes of Health (NIH), Rockville, MD 20852, USA
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88
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Affiliation(s)
- Michael K. Johnson
- Department of Chemistry and Department of Biochemistry & Molecular Biology, and Center for Metalloenzyme Studies, University of Georgia, Athens, Georgia 30602, and Division of Chemistry, California Institute of Technology, Pasadena, California 91125
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89
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Holm RH, Kennepohl P, Solomon EI. Structural and Functional Aspects of Metal Sites in Biology. Chem Rev 1996; 96:2239-2314. [PMID: 11848828 DOI: 10.1021/cr9500390] [Citation(s) in RCA: 1850] [Impact Index Per Article: 66.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Richard H. Holm
- Departments of Chemistry, Harvard University, Cambridge, Massachusetts 02138, and Stanford University, Stanford, California 94305
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90
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Oku H, Ueyama N, Nakamura A. Stabilization of Oxo-Metal Bonding by the π-Conjugated System in Dithiolate Ligands:cis-Dioxotungsten(VI) Bis(naphthalenedithiolato) and the Related Complexes as Models for Tungsten Oxidoreductases. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1996. [DOI: 10.1246/bcsj.69.3139] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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