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Hunter NH, Thomas CM. Polarized metal-metal multiple bonding and reactivity of phosphinoamide-bridged heterobimetallic group IV/cobalt compounds. Dalton Trans 2024. [PMID: 39224084 DOI: 10.1039/d4dt02064b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
Heterobimetallic complexes are studied for their ability to mimic biological systems as well as active sites in heterogeneous catalysts. While specific interest in early/late heterobimetallic systems has fluctuated, they serve as important models to fundamentally understand metal-metal bonding. Specifically, the polarized metal-metal multiple bonds formed in highly reduced early/late heterobimetallic complexes exemplify how each metal modulates the electronic environment and reactivity of the complex as a whole. In this Perspective, we chronicle the development of phosphinoamide-supported group IV/cobalt heterobimetallic complexes. This combination of metals allows access to a low valent Co-I center, which performs a rich variety of bond activation reactions when coupled with the pendent Lewis acidic metal center. Conversely, the low valent late transition metal is also observed to act as an electron reservoir, allowing for redox processes to occur at the d0 group IV metal site. Most of the bond activation reactions carried out by phosphinoamide-bridged M/Co-I (M = Ti, Zr, Hf) complexes are facilitated by cleavage of metal-metal multiple bonds, which serve as readily accessible electron reservoirs. Comparative studies in which both the number of buttressing ligands as well as the identity of the early metal were varied to give a library of heterobimetallic complexes are summarized, providing a thorough understanding of the reactivity of M/Co-I heterobimetallic systems.
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Affiliation(s)
- Nathanael H Hunter
- Department of Chemistry and Biochemistry, The Ohio State University, 100 W, 18th Ave, Columbus, OH 43210, USA.
| | - Christine M Thomas
- Department of Chemistry and Biochemistry, The Ohio State University, 100 W, 18th Ave, Columbus, OH 43210, USA.
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2
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Trevino RE, Fuller JT, Reid DJ, Laureanti JA, Ginovska B, Linehan JC, Shaw WJ. Understanding the role of negative charge in the scaffold of an artificial enzyme for CO 2 hydrogenation on catalysis. J Biol Inorg Chem 2024; 29:625-638. [PMID: 39207604 DOI: 10.1007/s00775-024-02070-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Accepted: 07/22/2024] [Indexed: 09/04/2024]
Abstract
We have approached the construction of an artificial enzyme by employing a robust protein scaffold, lactococcal multidrug resistance regulator, LmrR, providing a structured secondary and outer coordination spheres around a molecular rhodium complex, [RhI(PEt2NglyPEt2)2]-. Previously, we demonstrated a 2-3 fold increase in activity for one Rh-LmrR construct by introducing positive charge in the secondary coordination sphere. In this study, a series of variants was made through site-directed mutagenesis where the negative charge is located in the secondary sphere or outer coordination sphere, with additional variants made with increasingly negative charge in the outer coordination sphere while keeping a positive charge in the secondary sphere. Placing a negative charge in the secondary or outer coordination sphere demonstrates decreased activity by a factor of two compared to the wild-type Rh-LmrR. Interestingly, addition of positive charge in the secondary sphere, with the negatively charged outer coordination sphere restores activity. Vibrational and NMR spectroscopy suggest minimal changes to the electronic density at the rhodium center, regardless of inclusion of a negative or positive charge in the secondary sphere, suggesting another mechanism is impacting catalytic activity, explored in the discussion.
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Affiliation(s)
- Regina E Trevino
- Pacific Northwest National Laboratory, 902 Battelle Boulevard, MSIN J7-10, PO Box 999, Richland, WA, 99352, USA
| | - Jack T Fuller
- Pacific Northwest National Laboratory, 902 Battelle Boulevard, MSIN J7-10, PO Box 999, Richland, WA, 99352, USA
| | - Deseree J Reid
- Pacific Northwest National Laboratory, 902 Battelle Boulevard, MSIN J7-10, PO Box 999, Richland, WA, 99352, USA
| | - Joseph A Laureanti
- Pacific Northwest National Laboratory, 902 Battelle Boulevard, MSIN J7-10, PO Box 999, Richland, WA, 99352, USA
- Admiral Instruments, Tempe, AZ, 85281, USA
| | - Bojana Ginovska
- Pacific Northwest National Laboratory, 902 Battelle Boulevard, MSIN J7-10, PO Box 999, Richland, WA, 99352, USA
| | - John C Linehan
- Pacific Northwest National Laboratory, 902 Battelle Boulevard, MSIN J7-10, PO Box 999, Richland, WA, 99352, USA
| | - Wendy J Shaw
- Pacific Northwest National Laboratory, 902 Battelle Boulevard, MSIN J7-10, PO Box 999, Richland, WA, 99352, USA.
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Chiang CK, Liu YC, Chu KT, Chen JT, Tsai CY, Lee GH, Chiang MH, Lee CM. Stable Bimetallic Fe II/{Fe(NO) 2} 9 Moiety Derived from Reductive Transformations of a Diferrous-dinitrosyl Species. Inorg Chem 2022; 61:16325-16332. [PMID: 36198195 DOI: 10.1021/acs.inorgchem.2c02319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A dimeric dithiolate-bridged species, [Fe(NO)(PS2)]2 (1) containing two {FeNO}7 units, can be isolated by treating [Fe(CO)2(NO)2] with PS2H2 (PS2H2 = bis(2-dimercaptophenyl)phenylphosphine). Crystallographic studies reveal the syn-configuration of NO units and the bridging thiolates in the butterfly shape of the 2Fe2S core. Addition of PPh3 to the solution of dinuclear 1 leads to the formation of mononuclear {FeNO}7 [Fe(NO)(PS2)(PPh3)] (2) that shows electrochemical responses similar to those of 1. One-electron reduction of 1 with Cp*2Co or KC8 results in the isolation of thiolate-bridged bimetallic DNIC, [(PS2)Fe(μ-PS2)Fe(NO)2]- ([3]-), confirmed by several spectroscopies including single-crystal X-ray diffraction studies. The bimetallic DNIC [3]- is a rare example obtained from the one-electron reduction of a dinuclear Fe-NO {FeNO}7 model complex. With the assistance of redox behaviors of 2, electrochemical studies imply that the reduction of 1 leads to the formation of a mononuclear {FeNO}8 [Fe(NO)(PS2)(THF)]- intermediate, which involves disproportionation or NO- transfer to yield [3]-. Based on IR data and magnetic properties, the electronic structure of [3]- can be described as a FeII/{Fe(NO)2}9 state. Isolation of the {Fe(NO)2}9 moiety coordinated by the Fe ancillary complex lends strong support to the NO scrambling behavior in the effectiveness of the activity of flavodiiron nitric oxide reductases (FNORs).
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Affiliation(s)
- Chuan-Kuei Chiang
- Department of Applied Science, National Taitung University, Taitung950, Taiwan.,Institute of Chemistry, Academia Sinica, Taipei115, Taiwan
| | - Yu-Chiao Liu
- Institute of Chemistry, Academia Sinica, Taipei115, Taiwan
| | - Kai-Ti Chu
- Institute of Chemistry, Academia Sinica, Taipei115, Taiwan
| | - Jing-Ting Chen
- Institute of Chemistry, Academia Sinica, Taipei115, Taiwan
| | - Cheng-Yeh Tsai
- Institute of Chemistry, Academia Sinica, Taipei115, Taiwan
| | - Gene-Hsiang Lee
- Instrumentation Center, National Taiwan University, Taipei106, Taiwan
| | - Ming-Hsi Chiang
- Institute of Chemistry, Academia Sinica, Taipei115, Taiwan.,Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung807, Taiwan
| | - Chien-Ming Lee
- Department of Applied Science, National Taitung University, Taitung950, Taiwan
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Lehnert N, Kim E, Dong HT, Harland JB, Hunt AP, Manickas EC, Oakley KM, Pham J, Reed GC, Alfaro VS. The Biologically Relevant Coordination Chemistry of Iron and Nitric Oxide: Electronic Structure and Reactivity. Chem Rev 2021; 121:14682-14905. [PMID: 34902255 DOI: 10.1021/acs.chemrev.1c00253] [Citation(s) in RCA: 96] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Nitric oxide (NO) is an important signaling molecule that is involved in a wide range of physiological and pathological events in biology. Metal coordination chemistry, especially with iron, is at the heart of many biological transformations involving NO. A series of heme proteins, nitric oxide synthases (NOS), soluble guanylate cyclase (sGC), and nitrophorins, are responsible for the biosynthesis, sensing, and transport of NO. Alternatively, NO can be generated from nitrite by heme- and copper-containing nitrite reductases (NIRs). The NO-bearing small molecules such as nitrosothiols and dinitrosyl iron complexes (DNICs) can serve as an alternative vehicle for NO storage and transport. Once NO is formed, the rich reaction chemistry of NO leads to a wide variety of biological activities including reduction of NO by heme or non-heme iron-containing NO reductases and protein post-translational modifications by DNICs. Much of our understanding of the reactivity of metal sites in biology with NO and the mechanisms of these transformations has come from the elucidation of the geometric and electronic structures and chemical reactivity of synthetic model systems, in synergy with biochemical and biophysical studies on the relevant proteins themselves. This review focuses on recent advancements from studies on proteins and model complexes that not only have improved our understanding of the biological roles of NO but also have provided foundations for biomedical research and for bio-inspired catalyst design in energy science.
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Affiliation(s)
- Nicolai Lehnert
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Eunsuk Kim
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Hai T Dong
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Jill B Harland
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Andrew P Hunt
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Elizabeth C Manickas
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Kady M Oakley
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - John Pham
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Garrett C Reed
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Victor Sosa Alfaro
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
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Sun P, Yang D, Li Y, Wang B, Qu J. A bioinspired thiolate-bridged dinickel complex with a pendant amine: synthesis, structure and electrocatalytic properties. Dalton Trans 2020; 49:2151-2158. [PMID: 31994565 DOI: 10.1039/c9dt04493k] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
By employing X(CH2CH2S-)2 (X = S, tpdt; X = O, opdt; X = NPh, npdt) as bridging ligands, four thiolate-bridged dinickel complexes supported by phosphine ligands, [(dppe)Ni(μ-1SSS':2SS-tpdt)Ni(dppe)][PF6]2 (1[PF6]2, dppe = Ph2P(CH2)2PPh2), [(dppe)Ni(μ-1SSN:2SS-npdt)Ni(dppe)][PF6]2 (2[PF6]2) and [(dppe)Ni(t-Cl)(μ-1SSX:2SS-C4H8S2X)Ni(dppe)][PF6] (3[PF6], X = S; 4[PF6], X = O) were facilely obtained by the salt metathesis reaction. These four thiolate-bridged dinickel complexes have all been fully characterized by spectroscopic methods and X-ray crystallography. In 2[PF6]2, elongation of the Ni-N bond distance, possibly caused by steric hindrance, indicates that the pendant nitrogen group shuttles between the two nickel centers in solution, which is evidenced by 31P{1H} NMR spectroscopic results. Furthermore, these thiolate-bridged dinickel complexes have all been proved to be electrocatalysts for proton reduction to hydrogen. Notably, complex 2[PF6]2 featuring a pendant amine group in the secondary coordination sphere exhibits the best catalytic activity at a relatively low overpotential.
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Affiliation(s)
- Puhua Sun
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P.R. China.
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Cho SL, Liao CJ, Lu TT. Synthetic methodology for preparation of dinitrosyl iron complexes. J Biol Inorg Chem 2019; 24:495-515. [DOI: 10.1007/s00775-019-01668-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 05/15/2019] [Indexed: 12/29/2022]
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Sutthirat N, Ziller JW, Yang JY, Thammavongsy Z. Crystal structure of NiFe(CO) 5[tris(pyridyl-meth-yl)aza-phosphatrane]: a synthetic mimic of the NiFe hydrogenase active site incorporating a pendant pyridine base. Acta Crystallogr E Crystallogr Commun 2019; 75:438-442. [PMID: 31161052 PMCID: PMC6509684 DOI: 10.1107/s2056989019003256] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 03/06/2019] [Indexed: 11/22/2022]
Abstract
The reaction of Ni(TPAP)(COD) {where TPAP = [(NC5H4)CH2]3P(NC2H4)3N} with Fe(CO)5 resulted in the isolation of the title heterobimetallic NiFe(TPAP)(CO)5 complex di-μ-carbonyl-tricarbon-yl[2,8,9-tris-(pyridin-2-yl-meth-yl)-2,5,8,9-tetra-aza-1-phosphabi-cyclo-[3.3.3]undeca-ne]ironnickel, [FeNi(C24H30N7P)(CO)5]. Characterization of the complex by 1H and 31P NMR as well as IR spectroscopy are presented. The structure of NiFe(TPAP)(CO)5 reveals three terminally bound CO mol-ecules on Fe0, two bridging CO mol-ecules between Ni0 and Fe0, and TPAP coordinated to Ni0. The Ni-Fe bond length is 2.4828 (4) Å, similar to that of the reduced form of the active site of NiFe hydrogenase (∼2.5 Å). Additionally, a proximal pendant base from one of the non-coordinating pyridine groups of TPAP is also present. Although involvement of a pendant base has been cited in the mechanism of NiFe hydrogenase, this moiety has yet to be incorporated in a structurally characterized synthetic mimic with key structural motifs (terminally bound CO or CN ligands on Fe). Thus, the title complex NiFe(TPAP)(CO)5 is an unique synthetic model for NiFe hydrogenase. In the crystal, the complex mol-ecules are linked by C-H⋯O hydrogen bonds, forming undulating layers parallel to (100). Within the layers, there are offset π-π [inter-centroid distance = 3.2739 (5) Å] and C-H⋯π inter-actions present. The layers are linked by further C-H⋯π inter-actions, forming a supra-molecular framework.
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Affiliation(s)
- Natwara Sutthirat
- Department of Chemistry, University of California, Irvine, Natural Sciences II, Irvine, CA 92697, USA
| | - Joseph W. Ziller
- Department of Chemistry, University of California, Irvine, Natural Sciences II, Irvine, CA 92697, USA
| | - Jenny Y. Yang
- Department of Chemistry, University of California, Irvine, Natural Sciences II, Irvine, CA 92697, USA
| | - Zachary Thammavongsy
- Department of Chemistry, University of California, Irvine, Natural Sciences II, Irvine, CA 92697, USA
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Grabarczyk DB, Ash PA, Myers WK, Dodd EL, Vincent KA. Dioxygen controls the nitrosylation reactions of a protein-bound [4Fe4S] cluster. Dalton Trans 2019; 48:13960-13970. [DOI: 10.1039/c9dt00924h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Iron–sulfur clusters are exceptionally tuneable protein cofactors, and as one of their many roles they are involved in biological responses to nitrosative stress.
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Affiliation(s)
- Daniel B. Grabarczyk
- Department of Chemistry
- University of Oxford
- Inorganic Chemistry Laboratory
- Oxford
- UK
| | - Philip A. Ash
- Department of Chemistry
- University of Oxford
- Inorganic Chemistry Laboratory
- Oxford
- UK
| | - William K. Myers
- Department of Chemistry
- University of Oxford
- Inorganic Chemistry Laboratory
- Oxford
- UK
| | - Erin L. Dodd
- Department of Chemistry
- University of Oxford
- Inorganic Chemistry Laboratory
- Oxford
- UK
| | - Kylie A. Vincent
- Department of Chemistry
- University of Oxford
- Inorganic Chemistry Laboratory
- Oxford
- UK
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9
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Truong PT, Broering EP, Dzul SP, Chakraborty I, Stemmler TL, Harrop TC. Simultaneous nitrosylation and N-nitrosation of a Ni-thiolate model complex of Ni-containing SOD. Chem Sci 2018; 9:8567-8574. [PMID: 30568781 PMCID: PMC6253683 DOI: 10.1039/c8sc03321h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 09/17/2018] [Indexed: 11/21/2022] Open
Abstract
Nitric oxide (NO) is used as a substrate analogue/spectroscopic probe of metal sites that bind and activate oxygen and its derivatives. To assess the interaction of superoxide with the Ni center in Ni-containing superoxide dismutase (NiSOD), we studied the reaction of NO+ and NO with the model complex, Et4N[Ni(nmp)(SPh-o-NH2-p-CF3)] (1; nmp2- = dianion of N-(2-mercaptoethyl)picolinamide; -SPh-o-NH2-p-CF3 = 2-amino-4-(trifluoromethyl)benzenethiolate) and its oxidized analogue 1ox , respectively. The ultimate products of these reactions are the disulfide of -SPh-o-NH2-p-CF3 and the S,S-bridged tetrameric complex [Ni4(nmp)4], a result of S-based redox activity. However, introduction of NO to 1 affords the green dimeric {NiNO}10 complex (Et4N)2[{Ni(κ2-SPh-o-NNO-p-CF3)(NO)}2] (2) via NO-induced loss of nmp2- as the disulfide and N-nitrosation of the aromatic thiolate. Complex 2 was characterized by X-ray crystallography and several spectroscopies. These measurements are in-line with other tetrahedral complexes in the {NiNO}10 classification. In contrast to the established stability of this metal-nitrosyl class, the Ni-NO bond of 2 is labile and release of NO from this unit was quantified by trapping the NO with a CoII-porphyrin (70-80% yield). In the process, the Ni ends up coordinated by two o-nitrosaminobenzenethiolato ligands to result in the structurally characterized trans-(Et4N)2[Ni(SPh-o-NNO-p-CF3)2] (3), likely by a disproportionation mechanism. The isolation and characterization of 2 and 3 suggest that: (i) the strongly donating thiolates dominate the electronic structure of Ni-nitrosyls that result in less covalent Ni-NO bonds, and (ii) superoxide undergoes disproportionation via an outer-sphere mechanism in NiSOD as complexes in the {NiNO}9/8 state have yet to be isolated.
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Affiliation(s)
- Phan T Truong
- Department of Chemistry , Center for Metalloenzyme Studies , The University of Georgia , Athens , Georgia 30602 , USA .
| | - Ellen P Broering
- Department of Chemistry , Center for Metalloenzyme Studies , The University of Georgia , Athens , Georgia 30602 , USA .
| | - Stephen P Dzul
- Departments of Pharmaceutical Sciences, Biochemistry, and Molecular Biology , Wayne State University , Detroit , Michigan 48201 , USA
| | - Indranil Chakraborty
- Department of Chemistry and Biochemistry , Florida International University , Miami , Florida 33199 , USA
| | - Timothy L Stemmler
- Departments of Pharmaceutical Sciences, Biochemistry, and Molecular Biology , Wayne State University , Detroit , Michigan 48201 , USA
| | - Todd C Harrop
- Department of Chemistry , Center for Metalloenzyme Studies , The University of Georgia , Athens , Georgia 30602 , USA .
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Ghosh P, Ding S, Chupik RB, Quiroz M, Hsieh CH, Bhuvanesh N, Hall MB, Darensbourg MY. A matrix of heterobimetallic complexes for interrogation of hydrogen evolution reaction electrocatalysts. Chem Sci 2017; 8:8291-8300. [PMID: 29619175 PMCID: PMC5858031 DOI: 10.1039/c7sc03378h] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 10/11/2017] [Indexed: 11/21/2022] Open
Abstract
Experimental and computational studies address key questions in a structure-function analysis of bioinspired electrocatalysts for the HER. Combinations of NiN2S2 or [(NO)Fe]N2S2 as donors to (η5-C5H5)Fe(CO)+ or [Fe(NO)2]+/0 generate a series of four bimetallics, gradually "softened" by increasing nitrosylation, from 0 to 3, by the non-innocent NO ligands. The nitrosylated NiFe complexes are isolated and structurally characterized in two redox levels, demonstrating required features of electrocatalysis. Computational modeling of experimental structures and likely transient intermediates that connect the electrochemical events find roles for electron delocalization by NO, as well as Fe-S bond dissociation that produce a terminal thiolate as pendant base well positioned to facilitate proton uptake and transfer. Dihydrogen formation is via proton/hydride coupling by internal S-H+···-H-Fe units of the "harder" bimetallic arrangements with more localized electron density, while softer units convert H-···H-via reductive elimination from two Fe-H deriving from the highly delocalized, doubly reduced [Fe2(NO)3]- derivative. Computational studies also account for the inactivity of a Ni2Fe complex resulting from entanglement of added H+ in a pinched -S δ-···H+··· δ-S- arrangement.
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Affiliation(s)
- Pokhraj Ghosh
- Department of Chemistry , Texas A & M University , College Station , TX 77843 , USA .
| | - Shengda Ding
- Department of Chemistry , Texas A & M University , College Station , TX 77843 , USA .
| | - Rachel B Chupik
- Department of Chemistry , Texas A & M University , College Station , TX 77843 , USA .
| | - Manuel Quiroz
- Department of Chemistry , Texas A & M University , College Station , TX 77843 , USA .
| | - Chung-Hung Hsieh
- Department of Chemistry , Tamkang University , New Taipei City , Taiwan 25157
| | - Nattami Bhuvanesh
- Department of Chemistry , Texas A & M University , College Station , TX 77843 , USA .
| | - Michael B Hall
- Department of Chemistry , Texas A & M University , College Station , TX 77843 , USA .
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Sun P, Yang D, Li Y, Zhang Y, Su L, Wang B, Qu J. Thiolate-Bridged Nickel–Iron and Nickel–Ruthenium Complexes Relevant to the CO-Inhibited State of [NiFe]-Hydrogenase. Organometallics 2016. [DOI: 10.1021/acs.organomet.5b01035] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Puhua Sun
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Dawei Yang
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Ying Li
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Yahui Zhang
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Linan Su
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Baomin Wang
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Jingping Qu
- State Key Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
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Pulukkody R, Darensbourg MY. Synthetic advances inspired by the bioactive dinitrosyl iron unit. Acc Chem Res 2015; 48:2049-58. [PMID: 26090911 DOI: 10.1021/acs.accounts.5b00215] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Resulting from biochemical iron-NO interactions, dinitrosyl iron complexes (DNICs) are small organometallic-like molecules, considered to serve as vehicles for NO transport and storage in vivo. Formed by the interaction of NO with cellular iron sulfur clusters or with the cellular labile iron pool, DNICs have been documented to be the largest NO-derived adduct in cells, even surpassing the well-known nitrosothiols (RSNOs). Continuing efforts in biological chemistry are aimed at understanding the movement of DNICs in and out of cells, and their important role in NO-induced iron efflux leading to apoptosis in cells. Intrigued by the integrity of the unique dinitrosyl iron unit (DNIU) and the possibility of roles for it in human physiology or medicinal applications, the understanding of fundamental properties such as ligand effects on its ability to switch between two redox levels has been pursued through biomimetic complexes. Using metallodithiolates and N-heterocyclic carbenes (NHCs) as ligands to Fe(NO)2, the synthesis of a library of novel DNICs, in both the oxidized, {Fe(NO)2}(9), and reduced, {Fe(NO)2}(10), forms (Enemark-Feltham notation), offers opportunity to examine structural, reactivity, and spectroscopic features. The raison d'etre for the MN2S2·Fe(NO)2 synthesis development is for the potential to exploit the ease of accessing two redox levels on two different metal sites, a property presumably required for achieving two electron redox processes in base metals. Hence such molecules may be viewed as synthetic analogues of [NiFe]- or [FeFe]-hydrogenase active sites in nature, both of which use bridging thiolates for connection of the two centers. A particular success was the development of an Fe(NO)N2S2·Fe(NO)2(+/0) redox pair for proton reduction electrocatalysis. Monomeric, reduced NHC-DNICs of the L2Fe(NO)2 type are synthesized via the Fe(CO)2(NO)2 precursor, and oxidized thiolate-containing forms are derived from the dimeric (μ-RS)2[Fe(NO)2]2. Monomeric NHC-DNICs are four coordinate, pseudotetrahedral compounds with planar Fe(NO)2 units in which the slightly bent Fe-NO groups are directed symmetrically inward at both redox levels. They serve as stable analogues of biological histidine binding sites. In agreement with IR data, Mössbauer spectroscopic parameters, and DFT computations, the prototypic NHC-DNICs indicate extensive delocalization of the electron density of iron via π-backbonding. Such π-delocalization presents an unusual reaction path for the one electron process of RS(-)/RSSR interconversion. Comparisons with imidazole-DNICs find NHCs to be the "better" ligands to Fe(NO)2 and prompted investigations in (a) possible relationships between such imidazole- and NHC-containing DNICs, (b) systems that might mimic the reactivity of DNICs with the endogenous gaseotransmitter CO, and (c) mechanistic details of such processes. In a broader context, these studies aim to further describe the behavior of the {Fe(NO)2} unit as a single molecular entity when subjected to various ligand environments and reaction conditions.
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Affiliation(s)
- Randara Pulukkody
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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13
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Yang D, Li Y, Su L, Wang B, Qu J. Versatile Reactivity of CH3CN-Coordinated Nickel-Iron Heterodimetallic Complexes with Cp* Ligand on Diazadithiolate (N2S2) or Dithiadithiolate (S4) Platforms. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500304] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Li Y, Zhang Y, Yang D, Li Y, Sun P, Wang B, Qu J. Synthesis and Reactivity of Thioether-Dithiolate-Bridged Multi-iron Complexes. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00118] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ying Li
- State Key
Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Yahui Zhang
- State Key
Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Dawei Yang
- State Key
Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Yang Li
- State Key
Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Puhua Sun
- State Key
Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Baomin Wang
- State Key
Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
| | - Jingping Qu
- State Key
Laboratory of Fine
Chemicals, School of Pharmaceutical Science and Technology, Faculty
of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, People’s Republic of China
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15
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Abstract
The coordination chemistry of metal nitrosyls has expanded rapidly in the past decades due to major advances of nitric oxide and its metal compounds in biology. This review article highlights advances made in the area of multinuclear metal nitrosyl complexes, including Roussin's salts and their ester derivatives from 2003 to present. The review article focuses on isolated multinuclear metal nitrosyl complexes and is organized into different sections by the number of metal centers and bridging ligands.
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16
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Pinder TA, Montalvo SK, Hsieh CH, Lunsford AM, Bethel RD, Pierce BS, Darensbourg MY. Metallodithiolates as Ligands to Dinitrosyl Iron Complexes: Toward the Understanding of Structures, Equilibria, and Spin Coupling. Inorg Chem 2014; 53:9095-105. [DOI: 10.1021/ic501117f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Tiffany A. Pinder
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Steven K. Montalvo
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Chung-Hung Hsieh
- Department of Chemistry, Tamkang University, New Taipei
City 25157, Taiwan
| | - Allen M. Lunsford
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Ryan D. Bethel
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Brad S. Pierce
- Department of Chemistry and Biochemistry, College of Sciences, The University of Texas at Arlington, Arlington, Texas 76019, United States
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17
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Weber K, Erdem ÖF, Bill E, Weyhermüller T, Lubitz W. Modeling the Active Site of [NiFe] Hydrogenases and the [NiFeu] Subsite of the C-Cluster of Carbon Monoxide Dehydrogenases: Low-Spin Iron(II) Versus High-Spin Iron(II). Inorg Chem 2014; 53:6329-37. [DOI: 10.1021/ic500910z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Katharina Weber
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Özlen F. Erdem
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Thomas Weyhermüller
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Wolfgang Lubitz
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
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18
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Ogo S. H2and O2Activation-A Remarkable Insight into Hydrogenase. CHEM REC 2014; 14:397-409. [DOI: 10.1002/tcr.201402010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Indexed: 12/15/2022]
Affiliation(s)
- Seiji Ogo
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER); Kyushu University; 744 Moto-oka, Nishi-ku Fukuoka 819-0395 Japan
- Department of Chemistry and Biochemistry; Graduate School of Engineering; Kyushu University; 744 Moto-oka, Nishi-ku Fukuoka 819-0395 Japan
- Core Research for Evolutional Science and Technology (CREST); Japan Science and Technology Agency (JST); Kawaguchi Center Building; 4-1-8 Honcho Kawaguchi-shi Saitama 332-0012 Japan
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19
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Conradie J, Ghosh A. Stereochemical diversity of {MNO}(10) complexes: molecular orbital analyses of nickel and copper nitrosyls. Inorg Chem 2014; 53:4847-55. [PMID: 24796643 DOI: 10.1021/ic4028157] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The great majority of {NiNO}(10) complexes are characterized by short Ni-N(O) distances of 1.60-1.65 Å and linear NO units. Against this backdrop, the {CuNO}(10) unit in the recently reported [Cu(CH3NO2)5(NO)](2+) cation (1) has a CuNO angle of about 120° and a very long 1.96 Å Cu-N(O) bond. According to DFT calculations, metal-NO bonding in 1 consists of a single Cu(dz(2))-NO(π*) σ-interaction and essentially no metal(dπ)-NO(π*) π-bonding, which explains both the bent CuNO geometry and the long, weak Cu-N(O) bond. This σ-interaction is strongly favored by a ligand trans to the NO; indeed such a trans ligand may be critical for the existence and stability of a {CuNO}(10) unit. By contrast, {NiNO}(10) complexes exhibit a strong avoidance of such trans ligands. Thus, a five-coordinate {NiNO}(10) complex appears to favor a trigonal-bipyramidal structure with the NO in an equatorial position, as in the case of [Ni(bipy)2(NO)](+) (6). An unusual set of Ni(d)-NO(π*) orbital interactions accounts for the strongly bent NiNO geometry for this complex.
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Affiliation(s)
- Jeanet Conradie
- Department of Chemistry and Center for Theoretical and Computational Chemistry, University of Tromsø , N-9037 Tromsø, Norway
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20
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Holloway LR, Li L. The Preparation, Structural Characteristics, and Physical Chemical Properties of Metal-Nitrosyl Complexes. STRUCTURE AND BONDING 2013; 154:53-98. [PMID: 29398732 PMCID: PMC5792085 DOI: 10.1007/430_2013_101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The preparation and characterization of a representative group of novel non-heme metal nitrosyl complexes that have been synthesized over the last decade are discussed here. Their structures are examined and classified based on metal type, the number of metal centers present, and the type of ligand that is coordinated with the metal. The ligands can be phosphorus, nitrogen, or sulfur based (with a few exceptions) and can vary depending on the presence of chelation, intermolecular forces, or the presence of other ligands. Structural and bonding characteristics are summarized and examples of reactivity regarding nitrosyl ligands are given. Some of the relevant physical chemical properties of these complexes, including IR, EPR, NMR, UV-vis, cyclic voltammetry, and X-ray crystallography are examined.
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Affiliation(s)
- Lauren R Holloway
- Department of Chemistry and Biochemistry, California State University, 1250 Bellflower Boulevard, Long Beach, CA 90840, USA
| | - Lijuan Li
- Department of Chemistry and Biochemistry, California State University, 1250 Bellflower Boulevard, Long Beach, CA 90840, USA
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21
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Sartori G, Neto JSS, Pesarico AP, Back DF, Nogueira CW, Zeni G. Bis-vinyl selenides obtained via iron(iii) catalyzed addition of PhSeSePh to alkynes: synthesis and antinociceptive activity. Org Biomol Chem 2013; 11:1199-208. [DOI: 10.1039/c2ob27064a] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Weber K, Krämer T, Shafaat HS, Weyhermüller T, Bill E, van Gastel M, Neese F, Lubitz W. A Functional [NiFe]-Hydrogenase Model Compound That Undergoes Biologically Relevant Reversible Thiolate Protonation. J Am Chem Soc 2012. [DOI: 10.1021/ja309563p] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Katharina Weber
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Tobias Krämer
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Hannah S. Shafaat
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Thomas Weyhermüller
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Maurice van Gastel
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Wolfgang Lubitz
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
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23
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Xu C, Li Y, Goh LY, Pullarkat SA. New thioether–dithiolate complexes of Cp∗Ir and some reactivity features. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2011.09.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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24
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Hsieh CH, Chupik RB, Brothers SM, Hall MB, Darensbourg MY. cis-Dithiolatonickel as metalloligand to dinitrosyl iron units: the di-metallic structure of Ni(μ-SR)[Fe(NO)2] and an unexpected, abbreviated metalloadamantyl cluster, Ni2(μ-SR)4[Fe(NO)2]3. Dalton Trans 2011; 40:6047-53. [DOI: 10.1039/c1dt10438a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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25
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Ohki Y, Tatsumi K. Thiolate‐Bridged Iron–Nickel Models for the Active Site of [NiFe] Hydrogenase. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201001087] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yasuhiro Ohki
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo‐cho, Chikusa‐ku, 464–8602, Nagoya, Japan, Fax: +81‐52‐789‐2943
| | - Kazuyuki Tatsumi
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo‐cho, Chikusa‐ku, 464–8602, Nagoya, Japan, Fax: +81‐52‐789‐2943
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26
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Zheng C, Kim K, Matsumoto T, Ogo S. The useful properties of H2O as a ligand of a hydrogenase mimic. Dalton Trans 2010; 39:2218-25. [PMID: 20162194 DOI: 10.1039/b921273f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper investigates the required properties of Ru-coordinated ligands of a Ni-Ru based hydrogenase mimic. A series of ligands, including MeCN, pyridine, H(2)O and OH(-) were coordinated to Ru, with H(2)O being the only ligand to promote H(2)-activation. In addition, a tethered pyridyl moiety was synthesised and found to completely inhibit H(2)-activation. We conclude, therefore, that H(2)O is the ideal ligand for this mimic as a result of both its mild basicity and the availability of two lone pairs for simultaneous binding to Ru and H(2).
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Affiliation(s)
- Chunbai Zheng
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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27
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Ohki Y, Yasumura K, Ando M, Shimokata S, Tatsumi K. A model for the CO-inhibited form of [NiFe] hydrogenase: synthesis of CO3Fe(micro-StBu)3Ni{SC6H3-2,6-(mesityl)2} and reversible CO addition at the Ni site. Proc Natl Acad Sci U S A 2010; 107:3994-7. [PMID: 20147622 PMCID: PMC2840173 DOI: 10.1073/pnas.0913399107] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A [NiFe] hydrogenase model compound having a distorted trigonal-pyramidal nickel center, (CO)(3)Fe(micro-S(t)Bu)(3)Ni(SDmp), 1 (Dmp = C(6)H(3)-2,6-(mesityl)(2)), was synthesized from the reaction of the tetranuclear Fe-Ni-Ni-Fe complex [(CO)(3)Fe(micro-S(t)Bu)(3)Ni](2)(micro-Br)(2), 2 with NaSDmp at -40 degrees C. The nickel site of complex 1 was found to add CO or CN(t)Bu at -40 degrees C to give (CO)(3)Fe(S(t)Bu)(micro-S(t)Bu)(2)Ni(CO)(SDmp), 3, or (CO)(3)Fe(S(t)Bu)(micro-S(t)Bu)(2)Ni(CN(t)Bu)(SDmp), 4, respectively. One of the CO bands of 3, appearing at 2055 cm(-1) in the infrared spectrum, was assigned as the Ni-CO band, and this frequency is comparable to those observed for the CO-inhibited forms of [NiFe] hydrogenase. Like the CO-inhibited forms of [NiFe] hydrogenase, the coordination of CO at the nickel site of 1 is reversible, while the CN(t)Bu adduct 4 is more robust.
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Affiliation(s)
- Yasuhiro Ohki
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Kazunari Yasumura
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Masaru Ando
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Satoko Shimokata
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Kazuyuki Tatsumi
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
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28
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Wang R, Wang X, Sundberg EB, Nguyen P, Grant GPG, Sheth C, Zhao Q, Herron S, Kantardjieff KA, Li L. Synthesis, structures, spectroscopic and electrochemical properties of dinitrosyl iron complexes with bipyridine, terpyridine, and 1,10-phenathroline. Inorg Chem 2010; 48:9779-85. [PMID: 19769382 DOI: 10.1021/ic901368t] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Three new dinitrosyl iron complexes LFe(NO)(2) (L = 2,2'-bipyridine (bipy) (1), 2,2',2''-terpyridine (terpy) (2) and 1,10-phenathroline (phen) (3)) were synthesized by the reaction of Fe(NO)(2)(CO)(2) with corresponding ligands in tetrahydrofuran. Complexes 1-3 were studied using IR, UV-vis, MS, NMR, and electrochemical techniques. Complexes 1 and 2 were also characterized using single crystal X-ray diffraction analysis. IR spectra of complexes 1-3 display two strong characteristic NO stretching frequencies (nu(NO)) in the region reflecting donor properties of the ligands. Cyclic voltammetry studies show two quasi-reversible one-electron reductions for all complexes. Electrochemical investigations using different concentrations show that an irreversible one-electron reduction at -1.85 V for complex 2 and -1.80 V for complex 3 are from solvated species. Single-crystal X-ray structural analysis reveals that complex 1 crystallizes in the triclinic P1 space group and the asymmetric unit consists of one Fe(NO)(2)(bipy) molecule with the two NO groups located on two sides of Fe(bipy) plane. Complex 2 crystallizes in monoclinic P21/n space group, and the asymmetric unit contains one Fe(NO)(2)(terpy) molecule, in which the NO groups are located on two sides of the plane consisted of Fe and two coordinated pyridyl rings, but almost parallel to the uncoordinated pyridyl ring. The crystal packings of both complexes 1 and 2 show intermolecular H-bonding and strong pi-pi stacking interactions.
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Affiliation(s)
- Rongming Wang
- Department of Chemistry and Biochemistry, California State University, Long Beach, California 90840, USA
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29
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Pal S, Ohki Y, Yoshikawa T, Kuge K, Tatsumi K. Dithiolate-bridged Fe-Ni-Fe trinuclear complexes consisting of Fe(CO)(3-n)(CN)(n) (n = 0, 1) components relevant to the active site of [NiFe] hydrogenase. Chem Asian J 2009; 4:961-968. [PMID: 19130447 DOI: 10.1002/asia.200800434] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A dithiolate-bridged Fe-Ni-Fe trinuclear carbonyl complex [(CO)(3)Fe(mu-ndt)Ni(mu-ndt)Fe(CO)(3)] (1, ndt = norbornane-exo-2,3-dithiolate) has been synthesized from the reaction of [Fe(CO)(4)I(2)] and Li(2)[Ni(ndt)(2)]. This reaction was found to occur with concomitant formation of a tetranuclear cluster [Ni(3)(mu-ndt)(4)FeI] (2). Treatment of 1 with Na[N(SiMe(3))(2)] transforms some of the CO ligands into CN(-), and the monocyanide complex (PPh(4))[(CO)(2)(CN)Fe(mu-ndt)Ni(mu-ndt)Fe(CO)(3)] (3) and the dicyanide complex (PPh(4))(2)[(CO)(2)(CN)Fe(mu-ndt)Ni(mu-ndt)Fe(CO)(2)(CN)] (4) were isolated. X-ray structural analyses of the trinuclear complexes revealed a Fe-Ni-Fe array in which the metal centers are connected by the ndt sulfur bridges and direct Fe-Ni bonds. Hydrogen bonding between the CN ligand in 3 and cocrystallized ethanol was found in the solid-state structure. The monocyanide complex 3 and dicyanide complex 4 reacted with acids such as HOTf or HCl generating insoluble materials, whereas complex 1 did not react.
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Affiliation(s)
- Satyanarayan Pal
- Department of Chemistry, Graduate School of Science and Research Center for Materials, Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
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30
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Tard C, Pickett CJ. Structural and functional analogues of the active sites of the [Fe]-, [NiFe]-, and [FeFe]-hydrogenases. Chem Rev 2009; 109:2245-74. [PMID: 19438209 DOI: 10.1021/cr800542q] [Citation(s) in RCA: 1016] [Impact Index Per Article: 67.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cédric Tard
- Laboratoire d'Electrochimie Moléculaire, Unité Mixte de Recherche Université-CNRS 7591, Université Paris Diderot, 75013 Paris, France
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31
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Probing intermediates in the activation cycle of [NiFe] hydrogenase by infrared spectroscopy: the Ni-SIr state and its light sensitivity. J Biol Inorg Chem 2009; 14:1227-41. [PMID: 19626348 PMCID: PMC2847147 DOI: 10.1007/s00775-009-0566-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Accepted: 06/26/2009] [Indexed: 11/08/2022]
Abstract
The [NiFe] hydrogenase from the sulphate-reducing bacterium Desulfovibrio vulgaris Miyazaki F is reversibly inhibited in the presence of molecular oxygen. A key intermediate in the reactivation process, Ni-SIr, provides the link between fully oxidized (Ni-A, Ni-B) and active (Ni-SIa, Ni-C and Ni-R) forms of hydrogenase. In this work Ni-SIr was found to be light-sensitive (T ≤ 110 K), similar to the active Ni-C and the CO-inhibited states. Transition to the final photoproduct state (Ni-SL) was shown to involve an additional transient light-induced state (Ni-SI1961). Rapid scan kinetic infrared measurements provided activation energies for the transition from Ni-SL to Ni-SIr in protonated as well as in deuterated samples. The inhibitor CO was found not to react with the active site of the Ni-SL state. The wavelength dependence of the Ni-SIr photoconversion was examined in the range between 410 and 680 nm. Light-induced effects were associated with a nickel-centred electronic transition, possibly involving a change in the spin state of nickel (Ni2+). In addition, at T ≤ 40 K the CN− stretching vibrations of Ni-SL were found to be dependent on the colour of the monochromatic light used to irradiate the species, suggesting a change in the interaction of the hydrogen-bonding network of the surrounding amino acids. A possible mechanism for the photochemical process, involving displacement of the oxygen-based ligand, is discussed.
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32
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Tanino S, Li Z, Ohki Y, Tatsumi K. A Dithiolate-Bridged (CN)2(CO)Fe−Ni Complex Reproducing the IR Bands of [NiFe] Hydrogenase. Inorg Chem 2009; 48:2358-60. [DOI: 10.1021/ic900017s] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Soichiro Tanino
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Zilong Li
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Yasuhiro Ohki
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Kazuyuki Tatsumi
- Department of Chemistry, Graduate School of Science, and Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
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33
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Ichikawa K, Matsumoto T, Ogo S. Critical aspects of [NiFe]hydrogenase ligand composition. Dalton Trans 2009:4304-9. [DOI: 10.1039/b819395a] [Citation(s) in RCA: 17] [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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34
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35
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Ogata H, Lubitz W, Higuchi Y. [NiFe] hydrogenases: structural and spectroscopic studies of the reaction mechanism. Dalton Trans 2009:7577-87. [DOI: 10.1039/b903840j] [Citation(s) in RCA: 168] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Matsumoto T, Ohki Y, Tatsumi K. Organometallic Chemistry in [NiFe] Hydrogenases: Synthesis of the Structural and Functional Models. J SYN ORG CHEM JPN 2009. [DOI: 10.5059/yukigoseikyokaishi.67.540] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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37
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Ohki Y, Takikawa Y, Sadohara H, Kesenheimer C, Engendahl B, Kapatina E, Tatsumi K. Reactions at the Ru-S Bonds of Coordinatively Unsaturated Ruthenium Complexes with Tethered 2,6-Dimesitylphenyl Thiolate. Chem Asian J 2008; 3:1625-35. [DOI: 10.1002/asia.200800106] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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38
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Nickel–thiolate and iron–thiolate cyanocarbonyl complexes: Modeling the nickel and iron sites of [NiFe] hydrogenase. CR CHIM 2008. [DOI: 10.1016/j.crci.2008.04.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ohki Y, Yasumura K, Kuge K, Tanino S, Ando M, Li Z, Tatsumi K. Thiolate-bridged dinuclear iron(tris-carbonyl)-nickel complexes relevant to the active site of [NiFe] hydrogenase. Proc Natl Acad Sci U S A 2008; 105:7652-7. [PMID: 18511566 PMCID: PMC2409409 DOI: 10.1073/pnas.0800538105] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2008] [Indexed: 11/18/2022] Open
Abstract
The reaction of NiBr(2)(EtOH)(4) with a 1:2-3 mixture of FeBr(2)(CO)(4) and Na(SPh) generated a linear trinuclear Fe-Ni-Fe cluster (CO)(3)Fe(mu-SPh)(3)Ni(mu-SPh)(3)Fe(CO)(3), 1, whereas the analogous reaction system FeBr(2)(CO)(4)/Na(S(t)Bu)/NiBr(2)(EtOH)(4) (1:2-3:1) gave rise to a linear tetranuclear Fe-Ni-Ni-Fe cluster [(CO)(3)Fe(mu-S(t)Bu)(3)Ni(mu-Br)](2), 2. By using this tetranuclear cluster 2 as the precursor, we have developed a new synthetic route to a series of thiolate-bridged dinuclear Fe(CO)(3)-Ni complexes, the structures of which mimic [NiFe] hydrogenase active sites. The reactions of 2 with SC(NMe(2))(2) (tmtu), Na{S(CH(2))(2)SMe} and ortho-NaS(C(6)H(4))SR (R = Me, (t)Bu) led to isolation of (CO)(3)Fe(mu-S(t)Bu)(3)NiBr(tmtu), 3, (CO)(3)Fe(S(t)Bu)(mu-S(t)Bu)(2)Ni{S(CH(2))(2)SMe}, 4, and (CO)(3)Fe(S(t)Bu)(mu-S(t)Bu)(2)Ni{S(C(6)H(4))SR}, 5a (R = Me) and 5b (R = (t)Bu), respectively. On the other hand, treatment of 2 with 2-methylthio-phenolate (ortho-O(C(6)H(4))SMe) in methanol resulted in (CO)(3)Fe(mu-S(t)Bu)(3)Ni(MeOH){O(C(6)H(4))SMe}, 6a. The methanol molecule bound to Ni is labile and is readily released under reduced pressure to afford (CO)(3)Fe(S(t)Bu)(mu-S(t)Bu)(2)Ni{O(C(6)H(4))SMe}, 6b, and the coordination geometry of nickel changes from octahedral to square planar. Likewise, the reaction of 2 with NaOAc in methanol followed by crystallization from THF gave (CO)(3)Fe(mu-S(t)Bu)(3)Ni(THF)(OAc), 7. The dinuclear complexes, 3-7, are thermally unstable, and a key to their successful isolation is to carry out the reactions and manipulations at -40 degrees C.
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Affiliation(s)
- Yasuhiro Ohki
- Research Center for Materials Science, Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Kazunari Yasumura
- Research Center for Materials Science, Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Katsuaki Kuge
- Research Center for Materials Science, Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Soichiro Tanino
- Research Center for Materials Science, Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Masaru Ando
- Research Center for Materials Science, Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Zilong Li
- Research Center for Materials Science, Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Kazuyuki Tatsumi
- Research Center for Materials Science, Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
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Canaguier S, Artero V, Fontecave M. Modelling NiFe hydrogenases: nickel-based electrocatalysts for hydrogen production. Dalton Trans 2008:315-25. [DOI: 10.1039/b713567j] [Citation(s) in RCA: 131] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Maffett LS, Gunter KL, Kreisel KA, Yap GP, Rabinovich D. Nickel nitrosyl complexes in a sulfur-rich environment: The first poly(mercaptoimidazolyl)borate derivatives. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.06.024] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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42
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Shin RYC, Ng VWL, Koh LL, Tan GK, Goh LY, Webster RD. First Examples of a Dithiolato Bridge in (η6-C6Me6)RuII−Cr0,II,III Complexes. Synthetic, Single-Crystal X-ray Diffraction, and Electrochemical Studies. Organometallics 2007. [DOI: 10.1021/om700474k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Richard Yee Cheong Shin
- Department of Chemistry, National University of Singapore, Kent Ridge, Singapore 117543, and Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637616
| | - Victor Wee Lin Ng
- Department of Chemistry, National University of Singapore, Kent Ridge, Singapore 117543, and Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637616
| | - Lip Lin Koh
- Department of Chemistry, National University of Singapore, Kent Ridge, Singapore 117543, and Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637616
| | - Geok Kheng Tan
- Department of Chemistry, National University of Singapore, Kent Ridge, Singapore 117543, and Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637616
| | - Lai Yoong Goh
- Department of Chemistry, National University of Singapore, Kent Ridge, Singapore 117543, and Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637616
| | - Richard D. Webster
- Department of Chemistry, National University of Singapore, Kent Ridge, Singapore 117543, and Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637616
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43
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Windhager J, Rudolph M, Bräutigam S, Görls H, Weigand W. Reactions of 1,2,4-Trithiolane, 1,2,5-Trithiepane, 1,2,5-Trithiocane and 1,2,6-Trithionane with Nonacarbonyldiiron: Structural Determination and Electrochemical Investigation. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200700049] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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44
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Dai RJ, Ke SC. Detection and determination of the {Fe(NO)(2)} core vibrational features in dinitrosyl-iron complexes from experiment, normal coordinate analysis, and density functional theory: an avenue for probing the nitric oxide oxidation state. J Phys Chem B 2007; 111:2335-46. [PMID: 17295535 DOI: 10.1021/jp066964f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
As it is now well-established that nitric oxide plays an important role in many physiological processes, there is a renewed interest in dinitrosyl-iron complexes (DNICs). The question concerning the electronic structure of DNICs circles around the formal oxidation states of the iron and nitric oxide of the Fe(NO)2 core. Previous infrared measurements of nu(NO) alone point out inconsistencies in assigning electron configurations and charges on metals, inherent from the measurement of one parameter external to the metal. This work represents the first experimental and theoretical attempt to assign vibrational modes for the {Fe(NO)2}9 core of DNICs. The following complexes are investigated, [PPN][S5Fe(NO)2] (1), [PPN][Se5Fe(NO)2] (2), [PPN][(SPh)2Fe(NO)2] (3), and [PPN][(SePh)2Fe(NO)2] (4). The analysis of isotopically edited Raman data together with normal coordinate calculation permitted assignment of nu(NO) and nu(Fe-NO) stretching and delta(Fe-N-O) bending modes in these complexes. The assignments proposed are the first ever reported for the DNICs; a comparison of nu(NO) and nu(Fe-NO) stretching frequencies in DNICs is now feasible. The Fe(NO)2 core electronic configuration in these complexes is described as {Fe1+(*NO)2}. Results from 1 and 3 have been complemented by density functional theory (DFT) frequency calculations. In addition to providing a reasonably correct account of the observed frequencies, DFT calculations also give a good account of the frequency shifts upon 15NO substitution providing the first link between DFT and Raman spectroscopies for DNICs. Through the use of a combination of NO intraligand and metal-ligand vibrational data for the Fe(NO)2 core, normal coordinate analysis gives a NO stretching force constant, which compared to molecular NO gas, is significantly reduced for all four complexes. The hybrid U-B3LYP/6-311++G(3d,2p) density functional method has been employed to analyze the molecular orbital compositions of predominantly NO orbitals based on the crystal structure of complex 1. The molecular orbital not only revealed the bonding nature of the {Fe(NO)2}9 core but also provided a qualitative correct account of the observed low NO vibrational frequencies. The calculation shows that the NO is involved in a strong donor bonding interaction with the Fe1+. This donor bonding interaction involves the 5sigma molecular orbital of the NO, which is sigma-bonding with respect to the intramolecular NO bond, and removal of electron density from this orbital destabilizes the NO bond. Though it is too ambiguous to extrapolate a nu(Fe-NO)/nu(NO) correlation line for {Fe(NO)2}9 DNICs based only on the data reported here, the feasibility of using a vibrational systematics diagram to extract the electron configurations and charges on metals is demonstrated based on the vibrational data available in the literature for iron-nitrosyl complexes. The data provided here can be used as a model for the determination of effective charges on iron and the bonding of nitric oxides to metals in DNICs.
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Affiliation(s)
- Ruei Jang Dai
- Physics Department, National Dong Hwa University, Hualien 974-01, Taiwan
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45
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Stromnova TA, Shishilov ON, Churakov AV, Kuz'mina LG, Howard JAK. NO-disproportionation, promoted by Pd-cluster: formation and X-ray structure of Pd8(µ-CO)4(µ-OOCCMe3)8[µ-N(O)O–]4. Chem Commun (Camb) 2007:4800-2. [DOI: 10.1039/b710230e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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Chen TN, Lo FC, Tsai ML, Shih KN, Chiang MH, Lee GH, Liaw WF. Dinitrosyl iron complexes [E5Fe(NO)2]− (E=S, Se): A precursor of Roussin’s black salt [Fe4E3(NO)7]−. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.02.035] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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47
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Pardo A, De Lacey AL, Fernández VM, Fan HJ, Fan Y, Hall MB. Density functional study of the catalytic cycle of nickel–iron [NiFe] hydrogenases and the involvement of high-spin nickel(II). J Biol Inorg Chem 2006; 11:286-306. [PMID: 16511689 DOI: 10.1007/s00775-005-0076-3] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2005] [Accepted: 12/14/2005] [Indexed: 10/25/2022]
Abstract
In light of recent experiments suggesting high-spin (HS) Ni(II) species in the catalytic cycle of [NiFe] hydrogenase, a series of models of the Ni(II) forms Ni-SI(I,II), SI-CO and Ni-R(I,II,III) were examined in their high-spin states via density functional calculations. Because of its importance in the catalytic cycle, the Ni-C form was also included in this study. Unlike the Ni(II) forms in previous studies, in which a low-spin (LS) state was assumed and a square-planar structure found, the optimized geometries of these HS Ni(II) forms resemble those observed in the crystal structures: a distorted tetrahedral to distorted pyramidal coordination for the NiS4. This resemblance is particularly significant because the LS state is 20-30 kcal/mol less stable than the HS state for the geometry of the crystal structure. If these Ni(II) forms in the enzyme are not high spin, a large change in geometry at the active site is required during the catalytic cycle. Furthermore, only the HS state for the CO-inhibited form SI-CO has CO stretching frequencies that match the experimental results. As in the previous work, these new results show that the heterolytic cleavage reaction of dihydrogen (where H2 is cleaved with the metal acting as a hydride acceptor and a cysteine as the proton acceptor) has a lower energy barrier and is more exothermic when the active site is oxidized to Ni(III). The enzyme models described here are supported by a calibrated correlation of the calculated and measured CO stretching frequencies of the forms of the enzyme. The correlation coefficient for the final set of models of the forms of [NiFe] hydrogenase is 0.8.
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Affiliation(s)
- Alejandro Pardo
- Instituto de Catalisis, CSIC, c/ Marie Curie s/n, Campus de Cantoblanco, 28049, Madrid, Spain
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Zhu W, Marr AC, Wang Q, Neese F, Spencer DJE, Blake AJ, Cooke PA, Wilson C, Schröder M. Modulation of the electronic structure and the Ni-Fe distance in heterobimetallic models for the active site in [NiFe]hydrogenase. Proc Natl Acad Sci U S A 2005; 102:18280-5. [PMID: 16352727 PMCID: PMC1317917 DOI: 10.1073/pnas.0505779102] [Citation(s) in RCA: 145] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2005] [Indexed: 11/18/2022] Open
Abstract
Reaction of the mononuclear Ni(II) thiolate complexes [Ni(L)] [L, L(1), H2L(1), bis(2-mercaptoethyl)-1,2-dimercaptoethane; L(2), H2L(2), N,N'-dimethyl-N,N'-bis(2-mercaptoethyl)-bis(aminoethyl)sulfide] with [FeCp(CO)2I] gives the dithiolate-bridged heterobimetallic species, [Ni(L(1))FeCp(CO)]PF6, 1, and [Ni(L(2))FeCp]I, 2, respectively. Binding of a Fe(CO)3 fragment via reaction of square-planar [Ni(pdt)(dppe)] (dppe, 1,2-diphenylphosphinoethane; pdt(2-), 1,3-propanedithiolate) with Fe3(CO)12 or [Fe(CO)3(BDA)] (BDA, benzylidene acetone) affords diamagnetic [(dppe)Ni(mu-pdt)Fe(CO)3], 3, in which the Ni(II) center is bound tetrahedrally to two thiolate S-donors and to two P-donors. The complex [(dppe)Ni(mu-pdt)Fe(CO)3], 3, reacts in solution via rearrangement to afford [(OC)Ni(mu-dppe)(mu-pdt)Fe(CO)2], 4, in which one P-donor of dppe is bound to Ni and the other to Fe, and a CO ligand has transferred from Fe to Ni. Additionally, the syntheses of 3 and 4 afford the side products [(dppe)Ni(CO)2] and [(OC)3Fe(pdt)Fe(CO)3] together with the trinuclear species [(dppe)(CO)Fe(mu-CO)(mu-pdt)Fe(mu-pdt)Fe(CO)3], 5. Reaction of [Ni(pdt)(dppe)] with [FeCp(CO)2I] in CH2Cl2 affords two products [(dppe)Ni(mu-pdt)FeCp(CO)]PF6, 6, and [(dppe)Ni(pdt)(mu-I)Ni(dppe)]PF6, 7. The complexes 2, 3, and 4 show Ni-Fe distances of 2.539(4), 2.4666(6), and 2.4777(7) A, respectively, with relatively acute dihedral angles of 79.5-81.8 degrees for the Ni-S2-Fe bridge, thus mimicking the shortened Ni...Fe distance (2.5 A) and the acute dihedral angle of the Ni-S2-Fe moiety observed in certain active forms of [NiFe]hydrogenase. The role of direct Ni-Fe bonding in these complexes is discussed and linked to electronic structure calculations on [(dppe)Ni(pdt)Fe(CO)3], 3, which confirm the presence of a bent Ni(d(z2))-Fe(d(z2)) sigma-bond in a singlet ground state.
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Affiliation(s)
- Wenfeng Zhu
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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49
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Begum N, Hyder MI, Kabir SE, Hossain GMG, Nordlander E, Rokhsana D, Rosenberg E. Dithiolate Complexes of Manganese and Rhenium: X-ray Structure and Properties of an Unusual Mixed Valence Cluster Mn3(CO)6(μ-η2-SCH2CH2CH2S)3. Inorg Chem 2005; 44:9887-94. [PMID: 16363859 DOI: 10.1021/ic050987b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of Mn(2)(CO)(10) with 3,4-toluenedithiol and 1,2-ethanedithiol in the presence of Me(3)NO.2H(2)O in CH(2)Cl(2) at room temperature afforded the dinuclear complexes Mn(2)(CO)(6)(mu-eta(4)-SC(6)H(3)(CH(3))S-SC(6)H(3)(CH(3))S) (1), and Mn(2)(CO)(6)(mu-eta(4)-SCH(2)CH(2)S-SCH(2)CH(2)S) (2), respectively. Similar reactions of Re(2)(CO)(10) with 3,4-toluenedithiol, 1,2-benzenedithiol, and 1,2-ethanedithiol yielded the dirhenium complexes Re(2)(CO)(6)(mu-eta(4)-SC(6)H(3)(CH(3))S-SC(6)H(3)(CH(3))S) (3), Re(2)(CO)(6)(mu-eta(4)-SC(6)H(4)S-SC(6)H(4)S) (4), and Re(2)(CO)(6)(SCH(2)CH(2)S-SCH(2)CH(2)S) (5), respectively. In contrast, treatment of Mn(2)(CO)(10) with 1,3-propanedithiol afforded the trimanganese compound Mn(3)(CO)(6)(mu-eta(2)-SCH(2)CH(2)CH(2)S)(3) (6), whereas Re(2)(CO)(10) gave only intractable materials. The molecular structures of 1, 3, and 6 have been determined by single-crystal X-ray diffraction studies. The dimanganese and dirhenium carbonyl compounds 1-5contain a binucleating disulfide ligand, formed by interligand disulfide bond formation between two dithiolate ligands identical in structure to that of the previously reported dimanganese complex Mn(2)(CO)(6)(mu-eta(4)-SC(6)H(4)S-SC(6)H(4)S). Complex 6, on the other hand, forms a unique example of a mixed-valence trimangenese carbonyl compound containing three bridging 1,3-propanedithiolate ligands. The solution properties of 6 have been investigated by UV-vis and EPR spectroscopies as well as electrochemical techniques.
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Affiliation(s)
- Noorjahan Begum
- Department of Chemistry, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh
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50
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Shin RYC, Teo ME, Tan GK, Koh LL, Vittal JJ, Goh LY, Murray KS, Moubaraki B, Zhou XY. Square Planar versus Tetrahedral NiS4 Cores in the Coordination Spheres of (HMB)Ru(II) and Cp*Ru(III) and a Related CuS4 Complex. Synthetic, Single-Crystal X-ray Diffraction, and Magnetic Studies {HMB = η6-C6Me6 and Cp* = η5-C5Me5}. Organometallics 2005. [DOI: 10.1021/om050200p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | - X.-Y. Zhou
- Department of ABCT, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
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