1
|
Mondal S, Zhang W, Zhang S. Thermodynamics of Proton-Coupled Electron Transfer at Tricopper μ-Oxo/Hydroxo/Aqua Complexes. J Am Chem Soc 2024; 146:15036-15044. [PMID: 38770819 DOI: 10.1021/jacs.3c14420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
Multicopper oxidases (MCOs) utilize a tricopper active site to reduce dioxygen to water through 4H+ 4e- proton-coupled electron transfer (PCET). Understanding the thermodynamics of PCET at a tricopper cluster is essential for elucidating how MCOs harness the oxidative power of O2 while mitigating oxidative damage. In this study, we determined the O-H bond dissociation free energies (BDFEs) and pKa values of a series of tricopper hydroxo and tricopper aqua complexes as synthetic models of the tricopper site in MCOs. Tricopper intermediates on the path of alternating electron and proton transfer (ET-PT-ET-PT-ET) have modest BDFE(O-H) values in the range of 53.0-57.1 kcal/mol. In contrast, those not on the path of ET-PT-ET-PT-ET display much higher (78.1 kcal/mol) or lower (44.7 kcal/mol) BDFE(O-H) values. Additionally, the pKa of bridging OH and OH2 motifs increase by 8-16 pKa units per oxidation state. The same oxidation state changes have a lesser impact on the pKa of N-H motif in the secondary coordination sphere, with an increase of ca. 5 pKa units per oxidation state. The steeper pKa increase of the tricopper center promotes proton transfer from the secondary coordination sphere. Overall, our study shed light on the PCET pathway least prone to decomposition, elucidating why tricopper centers are an optimal choice for promoting efficient oxygen reduction reaction.
Collapse
Affiliation(s)
- Saikat Mondal
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Weiyao Zhang
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Shiyu Zhang
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| |
Collapse
|
2
|
Osei MK, Mirzaei S, Bogetti X, Castro E, Rahman MA, Saxena S, Hernández Sánchez R. Synthesis of Square Planar Cu
4
Clusters. Angew Chem Int Ed Engl 2022; 61:e202209529. [DOI: 10.1002/anie.202209529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Manasseh Kusi Osei
- Department of Chemistry Rice University 6100 Main St. Houston TX 77005 USA
- Department of Chemistry University of Pittsburgh 219 Parkman Avenue Pittsburgh PA 15260 USA
| | - Saber Mirzaei
- Department of Chemistry University of Pittsburgh 219 Parkman Avenue Pittsburgh PA 15260 USA
| | - Xiaowei Bogetti
- Department of Chemistry University of Pittsburgh 219 Parkman Avenue Pittsburgh PA 15260 USA
| | - Edison Castro
- Department of Chemistry University of Pittsburgh 219 Parkman Avenue Pittsburgh PA 15260 USA
| | - Mohammad Azizur Rahman
- Department of Chemistry University of Pittsburgh 219 Parkman Avenue Pittsburgh PA 15260 USA
| | - Sunil Saxena
- Department of Chemistry University of Pittsburgh 219 Parkman Avenue Pittsburgh PA 15260 USA
| | - Raúl Hernández Sánchez
- Department of Chemistry Rice University 6100 Main St. Houston TX 77005 USA
- Department of Chemistry University of Pittsburgh 219 Parkman Avenue Pittsburgh PA 15260 USA
| |
Collapse
|
3
|
Osei MK, Mirzaei S, Bogetti X, Castro E, Rahman MA, Saxena S, Hernandez Sanchez R. Synthesis of Square Planar Cu4 Clusters. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Manasseh Kusi Osei
- University of Pittsburgh Department of Chemistry 219 Parkman Ave 15260 Pittsburgh UNITED STATES
| | - Saber Mirzaei
- University of Pittsburgh Department of Chemistry 219 Parkman Avenue 15260 Pittsburgh UNITED STATES
| | - Xiaowei Bogetti
- University of Pittsburgh Department of Chemistry 219 Parkman Ave 15260 Pittsburgh UNITED STATES
| | - Edison Castro
- University of Pittsburgh Department of Chemistry 219 Parkman Ave 15260 Pittsburgh UNITED STATES
| | - Mohammad Azizur Rahman
- University of Pittsburgh Department of Chemistry 219 Parkman Ave 15260 Pittsburgh UNITED STATES
| | - Sunil Saxena
- University of Pittsburgh Department of Chemistry 219 Parkman Ave 15260 Pittsburgh UNITED STATES
| | - Raul Hernandez Sanchez
- Rice University Wiess School of Natural Sciences Chemistry 6100 Main St. 77005 Houston UNITED STATES
| |
Collapse
|
4
|
Zhang W, Moore CE, Zhang S. Multiple Proton-Coupled Electron Transfers at a Tricopper Cluster: Modeling the Reductive Regeneration Process in Multicopper Oxidases. J Am Chem Soc 2022; 144:1709-1717. [PMID: 35044761 DOI: 10.1021/jacs.1c10948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metal clusters in enzymes carry out the life-sustaining reactions by accumulating multiple redox equivalents in a narrow potential range. This redox potential leveling effect commonly observed in Nature has yet to be reproduced with synthetic metal clusters. Herein, we employ a fully encapsulated synthetic tricopper complex to model the three-electron two-proton reductive regeneration of fully reduced trinuclear copper cluster CuICuICuI(μ2-OH2) (FR) from native intermediate CuIICuIICuII(μ3-O) (NI) in multicopper oxidases (MCOs). The tricopper cluster can access four oxidation states (I,I,I to II,II,II) and four protonation states ([Cu3(μ3-O)]LH, [Cu3(μ3-OH)]L, [Cu3(μ3-OH)]LH, and [Cu3(μ3-OH2)]L, where LH denotes the protonated ligand), allowing mechanistic investigation of proton-coupled electron transfer (PCET) relevant to MCOs. Seven tricopper complexes with discrete oxidation and protonation states were characterized with spectroscopy or X-ray single-crystal diffraction. A stepwise electron transfer-proton transfer (ET-PT) mechanism is established for the reduction of CuIICuIICuII(μ3-O)LH to CuIICuIICuI(μ3-OH)L, while a stepwise PT-ET mechanism is determined for the reduction of CuIICuICuI(μ3-OH)LH to CuICuICuI(μ2-OH2)L. The switch-over from ET-PT to PT-ET mechanism showcases that the tricopper complex can adopt different PCET mechanisms to circumvent high-barrier proton transfer steps. Overall, three-electron two-proton reduction occurs within a narrow potential range of 170 mV, exemplifying the redox potential leveling effect of secondary proton relays in delivering multiple redox equivalents at metal clusters.
Collapse
Affiliation(s)
- Weiyao Zhang
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Curtis E Moore
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Shiyu Zhang
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| |
Collapse
|
5
|
Smits NWG, Rademaker D, Konovalov AI, Siegler MA, Hetterscheid DGH. Influence of the spatial distribution of copper sites on the selectivity of the oxygen reduction reaction. Dalton Trans 2021; 51:1206-1215. [PMID: 34951437 PMCID: PMC8763313 DOI: 10.1039/d1dt03296h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Moving towards a hydrogen economy raises the demand for affordable and efficient catalysts for the oxygen reduction reaction. Cu-bmpa (bmpa = bis(2-picolyl)amine) is shown to have moderate activity, but poor selectivity for the 4-electron reduction of oxygen to water. To enhance the selectivity towards water formation, the cooperative effect of three Cu-bmpa binding sites in a single trinuclear complex is investigated. The catalytic currents in the presence of the trinuclear sites are lower, possibly due to the more rigid structure and therefore higher reorganization energies and/or slower diffusion rates of the catalytic species. Although the oxygen reduction activity of the trinuclear complexes is lower than that of mononuclear Cu-bmpa, the selectivity of the copper mediated oxygen reduction was significantly enhanced towards the 4-electron process due to a cooperative effect between three copper centers that have been positioned in close proximity. These results indicate that the cooperativity between metal ions within biomimetic sites can greatly enhance the ORR selectivity.
Collapse
Affiliation(s)
- N W G Smits
- Leiden Institute of Chemistry, Leiden University, P.O. box 9502, 2300 RA Leiden, The Netherlands.
| | - D Rademaker
- Leiden Institute of Chemistry, Leiden University, P.O. box 9502, 2300 RA Leiden, The Netherlands.
| | - A I Konovalov
- Leiden Institute of Chemistry, Leiden University, P.O. box 9502, 2300 RA Leiden, The Netherlands.
| | - M A Siegler
- Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
| | - D G H Hetterscheid
- Leiden Institute of Chemistry, Leiden University, P.O. box 9502, 2300 RA Leiden, The Netherlands.
| |
Collapse
|
6
|
Sarkar S, Kim M, Lee H. Catecholase Activities of Copper(
II
) Complexes With
N
4
Ligands. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12303] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Shuranjan Sarkar
- Department of Chemistry and Green‐Nano Research Center Kyungpook National University Daegu 41566 Republic of Korea
- Chemistry Division Bangladesh Jute Research Institute Dhaka 1207 Bangladesh
| | - Minyoung Kim
- Department of Chemistry and Green‐Nano Research Center Kyungpook National University Daegu 41566 Republic of Korea
| | - Hong‐In Lee
- Department of Chemistry and Green‐Nano Research Center Kyungpook National University Daegu 41566 Republic of Korea
| |
Collapse
|
7
|
Zhang W, Moore CE, Zhang S. Encapsulation of tricopper cluster in a synthetic cryptand enables facile redox processes from Cu ICu ICu I to Cu IICu IICu II states. Chem Sci 2020; 12:2986-2992. [PMID: 34164067 PMCID: PMC8179370 DOI: 10.1039/d0sc05441k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
One-pot reaction of tris(2-aminoethyl)amine (TREN), [CuI(MeCN)4]PF6, and paraformaldehyde affords a mixed-valent [TREN4CuIICuICuI(μ3-OH)](PF6)3 complex. The macrocyclic azacryptand TREN4 contains four TREN motifs, three of which provide a bowl-shape binding pocket for the [Cu3(μ3-OH)]3+ core. The fourth TREN caps on top of the tricopper cluster to form a cryptand, imposing conformational constraints and preventing solvent interaction. Contrasting the limited redox capability of synthetic tricopper complexes reported so far, [TREN4CuIICuICuI(μ3-OH)](PF6)3 exhibits several reversible single-electron redox events. The distinct electrochemical behaviors of [TREN4CuIICuICuI(μ3-OH)](PF6)3 and its solvent-exposed analog [TREN3CuIICuIICuII(μ3-O)](PF6)4 suggest that isolation of tricopper core in a cryptand enables facile electron transfer, allowing potential application of synthetic tricopper complexes as redox catalysts. Indeed, the fully reduced [TREN4CuICuICuI(μ3-OH)](PF6)2 can reduce O2 under acidic conditions. The geometric constraints provided by the cryptand are reminiscent of Nature's multicopper oxidases (MCOs). For the first time, a synthetic tricopper cluster was isolated and fully characterized at CuICuICuI (4a), CuIICuICuI (4b), and CuIICuIICuI (4c) states, providing structural and spectroscopic models for many intermediates in MCOs. Fast electron transfer rates (105 to 106 M-1 s-1) were observed for both CuICuICuI/CuIICuICuI and CuIICuICuI/CuIICuIICuI redox couples, approaching the rapid electron transfer rates of copper sites in MCO.
Collapse
Affiliation(s)
- Weiyao Zhang
- Department of Chemistry and Biochemistry, The Ohio State University 100 W. 18th Ave Columbus OH USA
| | - Curtis E Moore
- Department of Chemistry and Biochemistry, The Ohio State University 100 W. 18th Ave Columbus OH USA
| | - Shiyu Zhang
- Department of Chemistry and Biochemistry, The Ohio State University 100 W. 18th Ave Columbus OH USA
| |
Collapse
|
8
|
|
9
|
Engelmann X, Farquhar ER, England J, Ray K. Four-electron reduction of dioxygen to water by a trinuclear copper complex. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.11.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
10
|
Wang VCC, Maji S, Chen PPY, Lee HK, Yu SSF, Chan SI. Alkane Oxidation: Methane Monooxygenases, Related Enzymes, and Their Biomimetics. Chem Rev 2017; 117:8574-8621. [PMID: 28206744 DOI: 10.1021/acs.chemrev.6b00624] [Citation(s) in RCA: 249] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Methane monooxygenases (MMOs) mediate the facile conversion of methane into methanol in methanotrophic bacteria with high efficiency under ambient conditions. Because the selective oxidation of methane is extremely challenging, there is considerable interest in understanding how these enzymes carry out this difficult chemistry. The impetus of these efforts is to learn from the microbes to develop a biomimetic catalyst to accomplish the same chemical transformation. Here, we review the progress made over the past two to three decades toward delineating the structures and functions of the catalytic sites in two MMOs: soluble methane monooxygenase (sMMO) and particulate methane monooxygenase (pMMO). sMMO is a water-soluble three-component protein complex consisting of a hydroxylase with a nonheme diiron catalytic site; pMMO is a membrane-bound metalloenzyme with a unique tricopper cluster as the site of hydroxylation. The metal cluster in each of these MMOs harnesses O2 to functionalize the C-H bond using different chemistry. We highlight some of the common basic principles that they share. Finally, the development of functional models of the catalytic sites of MMOs is described. These efforts have culminated in the first successful biomimetic catalyst capable of efficient methane oxidation without overoxidation at room temperature.
Collapse
Affiliation(s)
- Vincent C-C Wang
- Institute of Chemistry, Academia Sinica , 128, Section 2, Academia Road, Nankang, Taipei 11529, Taiwan
| | - Suman Maji
- School of Chemical Engineering and Physical Sciences, Lovely Professional University , Jalandhar-Delhi G. T. Road (NH-1), Phagwara, Punjab India 144411
| | - Peter P-Y Chen
- Department of Chemistry, National Chung Hsing University , 250 Kuo Kuang Road, Taichung 402, Taiwan
| | - Hung Kay Lee
- Department of Chemistry, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Steve S-F Yu
- Institute of Chemistry, Academia Sinica , 128, Section 2, Academia Road, Nankang, Taipei 11529, Taiwan
| | - Sunney I Chan
- Institute of Chemistry, Academia Sinica , 128, Section 2, Academia Road, Nankang, Taipei 11529, Taiwan.,Department of Chemistry, National Taiwan University , No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.,Noyes Laboratory, 127-72, California Institute of Technology , 1200 East California Boulevard, Pasadena, California 91125, United States
| |
Collapse
|
11
|
Guillet GL, Gordon JB, Di Francesco GN, Calkins MW, Čižmár E, Abboud KA, Meisel MW, García-Serres R, Murray LJ. A Family of Tri- and Dimetallic Pyridine Dicarboxamide Cryptates: Unusual O,N,O-Coordination and Facile Access to Secondary Coordination Sphere Hydrogen Bonding Interactions. Inorg Chem 2015; 54:2691-704. [DOI: 10.1021/ic502873d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Gary L. Guillet
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Jesse B. Gordon
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Gianna N. Di Francesco
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Matthew W. Calkins
- Department
of Physics and the National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611-8440, United States
| | - Erik Čižmár
- Institute
of Physics, Faculty of Science, P.J. Šafárik University, 04154 Košice, Slovakia
| | - Khalil A. Abboud
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Mark W. Meisel
- Department
of Physics and the National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611-8440, United States
| | - Ricardo García-Serres
- Laboratoire
de Chimie de Biologie des Métaux, UMR 5249, Université Joseph Fourier, Grenoble-1, CNRS-CEA, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France
| | - Leslie J. Murray
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| |
Collapse
|
12
|
Haldón E, Delgado-Rebollo M, Prieto A, Alvarez E, Maya C, Nicasio MC, Pérez PJ. Synthesis, Structural Characterization, Reactivity, and Catalytic Properties of Copper(I) Complexes with a Series of Tetradentate Tripodal Tris(pyrazolylmethyl)amine Ligands. Inorg Chem 2014; 53:4192-201. [DOI: 10.1021/ic500311y] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Estela Haldón
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química y Ciencias de los Materiales, Universidad de Huelva , Campus de El Carmen s/n, 21007 Huelva, Spain
| | | | | | | | | | | | | |
Collapse
|
13
|
Suseno S, Horak KT, Day MW, Agapie T. Trinuclear Nickel Complexes with Metal-Arene Interactions Supported by Tris- and Bis(phosphinoaryl)benzene Frameworks. Organometallics 2013; 32:6883-6886. [PMID: 24532865 PMCID: PMC3920585 DOI: 10.1021/om400976x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Triphosphine and diphosphine ligands with backbones designed to facilitate metal-arene interactions were employed to support multinuclear Ni complexes. Di- and trinuclear metal complexes supported by a triphosphine containing a triarylbenzene linker display diverse metal-arene binding modes. Multinuclear Ni halide complexes were isolated with strongly interacting metal centers bound to opposite faces of the coordinated arene. Upon reaction of the trinickel diiodide complex, 2, with disodium tetracarbonylferrate, a cofacial triangulo nickel(0) complex, 4, was isolated. The Ni03 cluster motif can also be supported by a para-terphenyldiphosphine, where a terminal carbon monoxide ligand replaces the third phosphine donor. All multinuclear complexes feature strong metal-arene interactions, demonstrating the use of an arene as a versatile ligand design element for small clusters.
Collapse
Affiliation(s)
- Sandy Suseno
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 127-72, Pasadena, California 91125, United States
| | - Kyle T. Horak
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 127-72, Pasadena, California 91125, United States
| | - Michael W. Day
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 127-72, Pasadena, California 91125, United States
| | - Theodor Agapie
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 127-72, Pasadena, California 91125, United States
| |
Collapse
|
14
|
Lionetti D, Day MW, Agapie T. Metal-Templated Ligand Architectures for Trinuclear Chemistry: Tricopper Complexes and Their O 2 Reactivity. Chem Sci 2012; 4:785-790. [PMID: 23539341 DOI: 10.1039/c2sc21758a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
A trinucleating framework was assmbled by templation of a heptadentate ligand around yttrium and lanthanides. The generated complexes orient three sets of two or three N-donors each for binding additional metal centers. Addition of three equivalents of copper(I) leads to the formation of tricopper(I) species. Reactions with dioxygen at low temperatures generate species whose spectroscopic features are consistent with a μ3,μ3-dioxo-tricopper complex. Reactivity studies were performed with a variety of substrates. The dioxo-tricopper species deprotonates weak acids, undergoes oxygen atom transfer with one equivalent of triphenylphosphine to yield triphenylphosphine oxide, and abstracts two hydrogen atom equivalents from tetramethylpiperidine-N-hydroxide (TEMPO-H). Thiophenols reduce the oxygenated species to a CuI3 complex and liberate two equivalents of disulfide, consistent with a four-electron four-proton process.
Collapse
Affiliation(s)
- Davide Lionetti
- Department of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd. MC 127-72, Pasadena, CA 91125, USA
| | | | | |
Collapse
|
15
|
Ghiladi RA, Rheingold AL, Siegler MA, Karlin KD. Synthesis and Characterization of New Trinuclear Copper Complexes. Inorganica Chim Acta 2012; 389:131-137. [PMID: 22773847 DOI: 10.1016/j.ica.2012.02.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
This report describes our approach towards modelling the copper cluster active sites of nitrous oxide reductase and the multicopper oxidases/oxygenases. We have synthesized two mesitylene-based trinucleating ligands, MesPY1 and MesPY2, which employ bis(2-picolyl)amine (PY1) and bis(2-pyridylethyl)amine (PY2) tridentate copper chelates, respectively. Addition of cuprous salts to these ligands leads to the isolation of tricopper(I) complexes [(Mes-PY1)Cu(I) (3)(CH(3)CN)(3)](ClO(4))(3)·0.25Et(2)O (1) and [(Mes-PY2)Cu(I) (3)](PF(6))(3) (3) Each of the three copper centers in 1 is most likely four-coordinate, with ligated acetonitrile as the fourth ligand; by contrast, the copper centers in 3 are three-coordinate, as determined by X-ray crystallography The synthesis of [(Mes-PY1)Cu(II) (3)(CH(3)CN)(2)(CH(3)OH)(2)](ClO(4))(6)·(CH(3)OH) (2) was accomplished by addition of three equivalents of the copper(II) salt, Cu(ClO(4))(2)·6H(2)O, to the ligand. The structure of 2 shows that two of the copper centers are tetracoordinate (with MeCN solvent ligation), but have additional weak axial (fifth ligand) interactions with the perchlorate anions; the third copper is unique in that it is coordinated by two MeOH solvent molecules, making it overall five-coordinate. For complexes 2 and 3, one copper ion center is located on the opposite side of the mesitylene plane as the other two. These observations, although in the solid state, must be taken into account for future studies where intramolecular tricopper(I)/O(2) (or other small molecules of interest) interactions in solution are desirable.
Collapse
Affiliation(s)
- Reza A Ghiladi
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | | | | | | |
Collapse
|
16
|
Maji S, Lee JCM, Lu YJ, Chen CL, Hung MC, Chen PPY, Yu SSF, Chan SI. Dioxygen Activation of a Trinuclear CuICuICuI Cluster Capable of Mediating Facile Oxidation of Organic Substrates: Competition between O-Atom Transfer and Abortive Intercomplex Reduction. Chemistry 2012; 18:3955-68. [DOI: 10.1002/chem.201103075] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Indexed: 11/09/2022]
|
17
|
Eames EV, Harris TD, Betley TA. Modulation of magnetic behavior vialigand-field effects in the trigonal clusters (PhL)Fe3L*3(L*= thf, py, PMe2Ph). Chem Sci 2012. [DOI: 10.1039/c1sc00492a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
18
|
Dai HF, Chen CH, Chen CS, Yeh WY. Synthesis and Characterization of the Triple Cluster (Cp3Fe4(CO)4(C5H4CH═NCH2CH2))3N and Its Function as a Tripodal Tetradentate Ligand. Organometallics 2011. [DOI: 10.1021/om200123v] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Huei-Fang Dai
- Department of Chemistry and Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
| | - Chia-Hsiang Chen
- Department of Chemistry and Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
| | - Chi-Shian Chen
- Department of Chemistry and Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
| | - Wen-Yann Yeh
- Department of Chemistry and Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
| |
Collapse
|
19
|
Tsui EY, Day MW, Agapie T. Trinucleating Copper: Synthesis and Magnetostructural Characterization of Complexes Supported by a Hexapyridyl 1,3,5-Triarylbenzene Ligand. Angew Chem Int Ed Engl 2011; 50:1668-72. [DOI: 10.1002/anie.201005232] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2010] [Revised: 10/24/2010] [Indexed: 11/10/2022]
|
20
|
Tsui EY, Day MW, Agapie T. Trinucleating Copper: Synthesis and Magnetostructural Characterization of Complexes Supported by a Hexapyridyl 1,3,5-Triarylbenzene Ligand. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201005232] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
21
|
Zhao Q, Betley TA. Synthesis and Redox Properties of Triiron Complexes Featuring Strong Fe-Fe Interactions. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201005198] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
22
|
Zhao Q, Betley TA. Synthesis and Redox Properties of Triiron Complexes Featuring Strong Fe-Fe Interactions. Angew Chem Int Ed Engl 2011; 50:709-12. [DOI: 10.1002/anie.201005198] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2010] [Indexed: 12/25/2022]
|
23
|
Abstract
Free energy barriers to biaryl tropoinversion in metal complexes with tropos phosphepine and azepine ligands were determined by temperature-dependent (31)P NMR inversion-transfer experiments and line shape analysis of the temperature-dependent (1)H NMR spectra, respectively. The barrier in the PdCl(2) complex of the azepine ligand was found to be slightly higher than that of the corresponding free ligand. Studies of a tridentate azepine ligand suggested that configurational change takes place without prior decoordination from the metal.
Collapse
Affiliation(s)
- Ester Fjellander
- KTH School of Chemical Science and Engineering, Department of Chemistry, SE 100 44 Stockholm, Sweden
| | | | | |
Collapse
|
24
|
Wenzel M, Wichmann K, Gloe K, Gloe K, Buschmann HJ, Otho K, Schröder M, Blake AJ, Wilson C, Mills AM, Lindoy LF, Plieger PG. Interaction of tripodal Schiff-base ligands with silver(i): structural and solution studies. CrystEngComm 2010. [DOI: 10.1039/c0ce00255k] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
25
|
Maiti D, Woertink JS, Ghiladi RA, Solomon EI, Karlin KD. Molecular oxygen and sulfur reactivity of a cyclotriveratrylene derived trinuclear copper(I) complex. Inorg Chem 2009; 48:8342-56. [PMID: 19663454 DOI: 10.1021/ic900975y] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Our continuing efforts into developing copper coordination chemistry relevant to dioxygen-processing copper proteins has led us to design and synthesize a cyclotriveratrylene (CTV)-based trinucleating ligand, CTV-TMPA, which employs tetradentate tris(2-pyridylmethyl)-amine chelates (TMPA) for their copper ion binding sites. Binding of three copper ions per CTV-TMPA unit was established by various chemical and spectroscopic methods such as UV-vis and resonance Raman (rR) spectroscopies. The following complexes were observed: A tricopper(I) complex [(CTV-TMPA)Cu(I)(3)](3+) (1), a CO adduct [(CTV-TMPA)Cu(I)(3)(CO)(3)](3+) (1-CO; nu(C=O) = 2094 cm(-1)), a triphenylphosphine adduct [(CTV-TMPA)Cu(I)(3)(PPh(3))(3)](3+) (1-PPh(3)), a tricopper(II) complex [(CTV-TMPA)Cu(II)(3)](3+) (1-Ox), and its tris-monochloride or tris-monobromide adducts. Also, introduction of dioxygen to the -80 degrees C solutions of 1 leads to O(2)-adducts, the first example of a synthetic copper complex which can stabilize a mononuclear Cu(II)-superoxo and dinuclear peroxo species simultaneously within one complex {[Cu] = 1.53 mM in THF: (mu-1,2-peroxo complex, lambda(max) = 543 (epsilon 9650) nm): nu(O-O) = 825 ((Delta(18)O(2)) = -47) cm(-1); nu(Cu-O) = 506 ((Delta(18)O(2)) = -26) cm(-1): (superoxo complex, lambda(max) = 427 (epsilon 3150) nm): nu(O-O) = 1129 ((Delta(18)O(2)) = -60) cm(-1); nu(Cu-O) = 463 ((Delta(18)O(2)) = -27) cm(-1)}. Elemental sulfur reacts reversibly with 1 leading to a (proposed) hexanuclear species [{(CTV-TMPA)Cu(II)(3)}(2)(mu-1,2-S(2)(2-))(3)](6+) (1-S) {lambda(max) = 544 (epsilon 7270) nm}, possessing one dicopper(II)-disulfide structural type: {THF solvent) nu(S-S) = 489 ((Delta(34)S) = -10) cm(-1); nu(Cu-S) = 307 ((Delta(34)S) = -5) cm(-1)}. Derivation of spectroscopic, structural, and chemical conclusions were aided by the study of a close mononuclear analogue with one pyridyl group of the TMPA parent possessing a 6-CH(2)OCH(3) substituent, this being part of the CTV-TMPA architecture.
Collapse
Affiliation(s)
- Debabrata Maiti
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | | | | | | | | |
Collapse
|
26
|
Shi Q, Thatcher R, Slattery J, Sauari P, Whitwood A, McGowan P, Douthwaite R. Synthesis, Coordination Chemistry and Bonding of Strong N-Donor Ligands Incorporating the 1H-Pyridin-(2E)-Ylidene (PYE) Motif. Chemistry 2009; 15:11346-60. [DOI: 10.1002/chem.200901382] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
27
|
One-pot synthesis of tripodal tris(2-aminoethyl)amine derivatives from seven molecular components. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.02.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
28
|
|