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Quiroz M, Jana M, Liu K, Bhuvanesh N, Hall MB, Darensbourg MY. Site specific redox properties in ligand differentiated di-nickel complexes inspired by the acetyl CoA synthase active site. Dalton Trans 2024; 53:7414-7423. [PMID: 38591102 DOI: 10.1039/d4dt00306c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
Bimetallic transition metal complexes with site-specific redox properties offer a versatile platform for understanding electron polarization, intramolecular electron transfer processes, and customizing electronic and magnetic properties that might impact reactivity and catalyst design. Inspired by the dissymmetric nickel sites in the Acetyl CoA Synthase (ACS) Active Site, three new bimetallic Ni(N2S2)-Ni(S2C2R2) complexes based on Ni(N2S2) metalloligand donor synthons, Nid, in mimicry of the nickel site distal to the redox-active iron sulfur cluster of ACS, and nickel dithiolene receiver units, designated as Nip, the nickel proximal to the 4Fe4S cluster, were combined to explore the influence of ligand environment on electronic structure and redox properties of each unit. The combination of synthons gave a matrix of three S-bridged dinickel complexes, characterized by X-ray crystallography, and appropriate spectroscopies. Computational modeling is connected to the electronic characteristics of the nickel donor and receiver units. This study demonstrated the intricacies of identifying sites of electrochemical redox processes, within multi-metallic systems containing non-innocent ligands.
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Affiliation(s)
- Manuel Quiroz
- Department of Chemistry, Texas A & M University, College Station, Texas 77843, USA.
| | - Manish Jana
- Department of Chemistry, Texas A & M University, College Station, Texas 77843, USA.
| | - Kaiyang Liu
- Department of Chemistry, Texas A & M University, College Station, Texas 77843, USA.
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A & M University, College Station, Texas 77843, USA.
| | - Michael B Hall
- Department of Chemistry, Texas A & M University, College Station, Texas 77843, USA.
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Quiroz M, Darensbourg MY. Development of (NO)Fe(N 2S 2) as a Metallodithiolate Spin Probe Ligand: A Case Study Approach. Acc Chem Res 2024; 57:831-844. [PMID: 38416694 PMCID: PMC10979402 DOI: 10.1021/acs.accounts.3c00667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 02/14/2024] [Accepted: 02/15/2024] [Indexed: 03/01/2024]
Abstract
ConspectusThe ubiquity of sulfur-metal connections in nature inspires the design of bi- and multimetallic systems in synthetic inorganic chemistry. Common motifs for biocatalysts developed in evolutionary biology include the placement of metals in close proximity with flexible sulfur bridges as well as the presence of π-acidic/delocalizing ligands. This Account will delve into the development of a (NO)Fe(N2S2) metallodithiolate ligand that harnesses these principles. The Fe(NO) unit is the centroid of a N2S2 donor field, which as a whole is capable of serving as a redox-active, bidentate S-donor ligand. Its paramagnetism as well as the ν(NO) vibrational monitor can be exploited in the development of new classes of heterobimetallic complexes. We offer four examples in which the unpaired electron on the {Fe(NO)}7 unit is spin-paired with adjacent paramagnets in proximal and distal positions.First, the exceptional stability of the (NO)Fe(N2S2)-Fe(NO)2 platform, which permits its isolation and structural characterization at three distinct redox levels, is linked to the charge delocalization occurring on both the Fe(NO) and the Fe(NO)2 supports. This accommodates the formation of a rare nonheme {Fe(NO)}8 triplet state, with a linear configuration. A subsequent FeNi complex, featuring redox-active ligands on both metals (NO on iron and dithiolene on nickel), displayed unexpected physical properties. Our research showed good reversibility in two redox processes, allowing isolation in reduced and oxidized forms. Various spectroscopic and crystallographic analyses confirmed these states, and Mössbauer data supported the redox change at the iron site upon reduction. Oxidation of the complex produced a dimeric dication, revealing an intriguing magnetic behavior. The monomer appears as a spin-coupled diradical between {Fe(NO)}7 and the nickel dithiolene monoradical, while dimerization couples the latter radical units via a Ni2S2 rhomb. Magnetic data (SQUID) on the dimer dication found a singlet ground state with a thermally accessible triplet state that is responsible for magnetism. A theoretical model built on an H4 chain explains this unexpected ferromagnetic low-energy triplet state arising from the antiferromagnetic coupling of a four-radical molecular conglomerate. For comparison, two (NO)Fe(N2S2) were connected through diamagnetic group 10 cations producing diradical trimetallic complexes. Antiferromagnetic coupling is observed between {Fe(NO)}7 units, with exchange coupling constants (J) of -3, -23, and -124 cm-1 for NiII, PdII, and PtII, respectively. This trend is explained by the enhanced covalency and polarizability of sulfur-dense metallodithiolate ligands. A central paramagnetic trans-Cr(NO)(MeCN) receiver unit core results in a cissoid structural topology, influenced by the stereoactivity of the lone pair(s) on the sulfur donors. This {Cr(NO)}5 radical bridge, unlike all previous cases, finds the coupling between the distal Fe(NO) radicals to be ferromagnetic (J = 24 cm-1).The stability and predictability of this S = 1/2 moiety and the steric/electronic properties of the bridging thiolate sulfurs suggest it to be a likely candidate for the development of novel molecular (magnetic) compounds and possibly materials. The role of synthetic inorganic chemistry in designing synthons that permit connections of the (NO)Fe(N2S2) metalloligand is highlighted as well as the properties of the heterobi- and polymetallic complexes derived therefrom.
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Affiliation(s)
- Manuel Quiroz
- Department of Chemistry, Texas
A & M University, College Station, Texas 77843, United States
| | - Marcetta Y. Darensbourg
- Department of Chemistry, Texas
A & M University, College Station, Texas 77843, United States
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Wu WY, Zheng WY, Chen WT, Tsai FT, Tsai ML, Pao CW, Chen JL, Liaw WF. Electronic Structure and Transformation of Dinitrosyl Iron Complexes (DNICs) Regulated by Redox Non-Innocent Imino-Substituted Phenoxide Ligand. Inorg Chem 2024; 63:2431-2442. [PMID: 38258796 PMCID: PMC10848267 DOI: 10.1021/acs.inorgchem.3c03367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 01/04/2024] [Accepted: 01/10/2024] [Indexed: 01/24/2024]
Abstract
The coupled NO-vibrational peaks [IR νNO 1775 s, 1716 vs, 1668 vs cm-1 (THF)] between two adjacent [Fe(NO)2] groups implicate the electron delocalization nature of the singly O-phenoxide-bridged dinuclear dinitrosyliron complex (DNIC) [Fe(NO)2(μ-ON2Me)Fe(NO)2] (1). Electronic interplay between [Fe(NO)2] units and [ON2Me]- ligand in DNIC 1 rationalizes that "hard" O-phenoxide moiety polarizes iron center(s) of [Fe(NO)2] unit(s) to enforce a "constrained" π-conjugation system acting as an electron reservoir to bestow the spin-frustrated {Fe(NO)2}9-{Fe(NO)2}9-[·ON2Me]2- electron configuration (Stotal = 1/2). This system plays a crucial role in facilitating the ligand-based redox interconversion, working in harmony to control the storage and redox-triggered transport of the [Fe(NO)2]10 unit, while preserving the {Fe(NO)2}9 core in DNICs {Fe(NO)2}9-[·ON2Me]2- [K-18-crown-6-ether)][(ON2Me)Fe(NO)2] (2) and {Fe(NO)2}9-[·ON2Me] [(ON2Me)Fe(NO)2][PF6] (3). Electrochemical studies suggest that the redox interconversion among [{Fe(NO)2}9-[·ON2Me]2-] DNIC 3 ↔ [{Fe(NO)2}9-[ON2Me]-] ↔ [{Fe(NO)2}9-[·ON2Me]] DNIC 2 are kinetically feasible, corroborated by the redox shuttle between O-bridged dimerized [(μ-ONMe)2Fe2(NO)4] (4) and [K-18-crown-6-ether)][(ONMe)Fe(NO)2] (5). In parallel with this finding, the electronic structures of [{Fe(NO)2}9-{Fe(NO)2}9-[·ON2Me]2-] DNIC 1, [{Fe(NO)2}9-[·ON2Me]2-] DNIC 2, [{Fe(NO)2}9-[·ON2Me]] DNIC 3, [{Fe(NO)2}9-[ONMe]-]2 DNIC 4, and [{Fe(NO)2}9-[·ONMe]2-] DNIC 5 are evidenced by EPR, SQUID, and Fe K-edge pre-edge analyses, respectively.
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Affiliation(s)
- Wun-Yan Wu
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Wei-Yuan Zheng
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Wei-Ting Chen
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Fu-Te Tsai
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Ming-Li Tsai
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Chih-Wen Pao
- National Synchrotron Radiation
Research Center, Hsinchu 30013, Taiwan
| | - Jeng-Lung Chen
- National Synchrotron Radiation
Research Center, Hsinchu 30013, Taiwan
| | - Wen-Feng Liaw
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
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Jana M, Zheng X, Le T, Quiroz M, Guererro‐Almaraz P, Darensbourg DJ, Darensbourg MY. Bond Trading: Intramolecular Metal and Ligand Exchange within a NO/Ni/Co Complex. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2307113. [PMID: 38044312 PMCID: PMC10853699 DOI: 10.1002/advs.202307113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Indexed: 12/05/2023]
Abstract
With the goal of generating hetero-redox levels on metals as well as on nitric oxide (NO), metallodithiolate (N2 S2 )CoIII (NO- ), N2 S2 = N,N- dibenzyl-3,7-diazanonane-1,9-dithiolate, is introduced as ligand to a well-characterized labile [Ni0 (NO)+ ] synthon. The reaction between [Ni0 (NO+ )] and [CoIII (NO- )] has led to a remarkable electronic and ligand redistribution to form a heterobimetallic dinitrosyl cobalt [(N2 S2 )NiII ∙Co(NO)2 ]+ complex with formal two electron oxidation state switches concomitant with the nickel extraction or transfer as NiII into the N2 S2 ligand binding site. To date, this is the first reported heterobimetallic cobalt dinitrosyl complex.
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Affiliation(s)
- Manish Jana
- Department of ChemistryTexas A&M UniversityCollege StationTX77843USA
| | - Xueyan Zheng
- Department of ChemistryTexas A&M UniversityCollege StationTX77843USA
| | - Trung Le
- Department of ChemistryTexas A&M UniversityCollege StationTX77843USA
| | - Manuel Quiroz
- Department of ChemistryTexas A&M UniversityCollege StationTX77843USA
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5
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Jana M, Quiroz M, Darensbourg MY. A single carbon atom controls the geometry and reactivity of Co II(N 2S 2) complexes. Chem Commun (Camb) 2024; 60:1128-1131. [PMID: 38180490 DOI: 10.1039/d3cc05394f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
Three- vs. two-carbon N-to-N connectors give rise to monomeric, tetrahedral N2S2Co(II) (μeff = 4.24 BM) or dimeric [(N2S2)Co(II)]2 (diamagnetic) complexes, respectively. Differences in the derivative products of the Lewis acid receivers, W0(CO)3 and W0(CO)4, illustrate nucleophilicity of the thiolate sulfur lone pairs in each case, as well as their structural control.
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Affiliation(s)
- Manish Jana
- Department of Chemistry, Texas A&M University, College Station, Texas-77843, USA.
| | - Manuel Quiroz
- Department of Chemistry, Texas A&M University, College Station, Texas-77843, USA.
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Guerrero-Almaraz P, Quiroz M, Rodriguez DR, Jana M, Hall MB, Darensbourg MY. Sulfur Lone Pairs Control Topology in Heterotrimetallic Complexes: An Experimental and Theoretical Study. ACS ORGANIC & INORGANIC AU 2023; 3:393-402. [PMID: 38075453 PMCID: PMC10704581 DOI: 10.1021/acsorginorgau.3c00025] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 08/25/2023] [Accepted: 08/28/2023] [Indexed: 02/12/2024]
Abstract
Heterotrimetallic complexes with (N2S2)M metallodithiolates, M = Ni2+, [Fe(NO)]2+, and [Co(NO)]2+, as bidentate chelating ligands to a central trans-Cr(NO)(MeCN) unit were characterized as the first members of a new class, NiCrNi, FeCrFe, CoCrCo. The complexes exhibit a cisoid structural topology, ascribed to the stereoactivity of the available lone pair(s) on the sulfur donors, resulting in a dispersed, electropositive pocket from the N/N and N/S hydrocarbon linkers wherein the Cr-NO site is housed. Computational studies explored alternative isomers (transoid and inverted cisoid) that suggest a combination of electronic and steric effects govern the geometrical selectivity. Electrostatic potential maps readily display the dominant electronegative potential from the sulfurs which force the NO to the electropositive pocket. The available S lone pairs work in synergy with the π-withdrawing ability of NO to lift Cr out of the S4 plane toward the NO and stabilize the geometry. The metallodithiolate ligands bound to Cr(NO) thus find structural consistency across the three congeners. Although the dinitrosyl [(bme-dach)Co(NO)-Mo(NO)(MeCN)-(bme-dach)Co(MeCN)][PF6]2 (CoMoCo') analogue displays chemical noninnocence and a partial Mo-Co bond toward (N2S2)Co'(NCCH3) in an "asymmetric butterfly" topology [Guerrero-Almaraz P.Inorg. Chem.2021, 60(21 (21), ), 15975-15979], the stability of the {Cr(NO)}5 unit prohibits such bond rearrangement. Magnetism and EPR studies illustrate spin coupling across the sulfur thiolate sulfur bridges.
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Affiliation(s)
| | - Manuel Quiroz
- Department of Chemistry, Texas A&M University, College
Station, Texas 77843, United States
| | - David R. Rodriguez
- Department of Chemistry, Texas A&M University, College
Station, Texas 77843, United States
| | - Manish Jana
- Department of Chemistry, Texas A&M University, College
Station, Texas 77843, United States
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, College
Station, Texas 77843, United States
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Liao CJ, Tseng YT, Cheng YA, Dayao LA, Iffland-Mühlhaus L, Gee LB, Ribson RD, Chan TS, Apfel UP, Lu TT. Ligand Control of Dinitrosyl Iron Complexes for Selective Superoxide-Mediated Nitric Oxide Monooxygenation and Superoxide-Dioxygen Interconversion. J Am Chem Soc 2023; 145:20389-20402. [PMID: 37683125 DOI: 10.1021/jacs.3c05577] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/10/2023]
Abstract
Through nitrosylation of [Fe-S] proteins, or the chelatable iron pool, a dinitrosyl iron unit (DNIU) [Fe(NO)2] embedded in the form of low-molecular-weight/protein-bound dinitrosyl iron complexes (DNICs) was discovered as a metallocofactor assembled under inflammatory conditions with elevated levels of nitric oxide (NO) and superoxide (O2-). In an attempt to gain biomimetic insights into the unexplored transformations of the DNIU under inflammation, we investigated the reactivity toward O2- by a series of DNICs [(NO)2Fe(μ-MePyr)2Fe(NO)2] (1) and [(NO)2Fe(μ-SEt)2Fe(NO)2] (3). During the superoxide-induced conversion of DNIC 1 into DNIC [(K-18-crown-6-ether)2(NO2)][Fe(μ-MePyr)4(μ-O)2(Fe(NO)2)4] (2-K-crown) and a [Fe3+(MePyr)x(NO2)y(O)z]n adduct, stoichiometric NO monooxygenation yielding NO2- occurs without the transient formation of peroxynitrite-derived •OH/•NO2 species. To study the isoelectronic reaction of O2(g) and one-electron-reduced DNIC 1, a DNIC featuring an electronically localized {Fe(NO)2}9-{Fe(NO)2}10 electronic structure, [K-18-crown-6-ether][(NO)2Fe(μ-MePyr)2Fe(NO)2] (1-red), was successfully synthesized and characterized. Oxygenation of DNIC 1-red leads to the similar assembly of DNIC 2-K-crown, of which the electronic structure is best described as paramagnetic with weak antiferromagnetic coupling among the four S = 1/2 {FeIII(NO-)2}9 units and S = 5/2 Fe3+ center. In contrast to DNICs 1 and 1-red, DNICs 3 and [K-18-crown-6-ether][(NO)2Fe(μ-SEt)2Fe(NO)2] (3-red) display a reversible equilibrium of "3 + O2- ⇋ 3-red + O2(g)", which is ascribed to the covalent [Fe(μ-SEt)2Fe] core and redox-active [Fe(NO)2] unit. Based on this study, the supporting/bridging ligands in dinuclear DNIC 1/3 (or 1-red/3-red) control the selective monooxygenation of NO and redox interconversion between O2- and O2 during reaction with O2- (or O2).
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Affiliation(s)
- Cheng-Jhe Liao
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yu-Ting Tseng
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yu-An Cheng
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Loise Ann Dayao
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Linda Iffland-Mühlhaus
- Department of Chemistry and Biochemistry, Inorganic Chemistry I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Leland B Gee
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Ryan D Ribson
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Ulf-Peter Apfel
- Department of Chemistry and Biochemistry, Inorganic Chemistry I, Ruhr-Universität Bochum, 44801 Bochum, Germany
- Department of Electrosynthesis, Fraunhofer UMSICHT, 46047 Oberhausen, Germany
| | - Tsai-Te Lu
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
- Department of Chemistry, Chung Yuan Christian University, Taoyuan 32023, Taiwan
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8
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Quiroz M, Lockart MM, Xue S, Jones D, Guo Y, Pierce BS, Dunbar KR, Hall MB, Darensbourg MY. Magnetic coupling between Fe(NO) spin probe ligands through diamagnetic Ni II, Pd II and Pt II tetrathiolate bridges. Chem Sci 2023; 14:9167-9174. [PMID: 37655023 PMCID: PMC10466285 DOI: 10.1039/d3sc01546g] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 08/07/2023] [Indexed: 09/02/2023] Open
Abstract
Reaction of the nitrosylated-iron metallodithiolate ligand, paramagnetic (NO)Fe(N2S2), with [M(CH3CN)n][BF4]2 salts (M = NiII, PdII, and PtII; n = 4 or 6) affords di-radical tri-metallic complexes in a stairstep type arrangement ([FeMFe]2+, M = Ni, Pd, and Pt), with the central group 10 metal held in a MS4 square plane. These isostructural compounds have nearly identical ν(NO) stretching values, isomer shifts, and electrochemical properties, but vary in their magnetic properties. Despite the intramolecular Fe⋯Fe distances of ca. 6 Å, antiferromagnetic coupling is observed between {Fe(NO)}7 units as established by magnetic susceptibility, EPR, and DFT studies. The superexchange interaction through the thiolate sulfur and central metal atoms is on the order of NiII < PdII ≪ PtII with exchange coupling constants (J) of -3, -23, and -124 cm-1, consistent with increased covalency of the M-S bonds (3d < 4d < 5d). This trend is reproduced by DFT calculations with molecular orbital analysis providing insight into the origin of the enhancement in the exchange interaction. Specifically, the magnitude of the exchange interaction correlates surprisingly well with the energy difference between the HOMO and HOMO-1 orbitals of the triplet states, which is reflected in the central metal's contribution to these orbitals. These results demonstrate the ability of sulfur-dense metallodithiolate ligands to engender strong magnetic communication by virtue of their enhanced covalency and polarizability.
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Affiliation(s)
- Manuel Quiroz
- Department of Chemistry, Texas A &M University College Station Texas 77843 USA
| | - Molly M Lockart
- Department of Chemistry & Biochemistry, Samford University Birmingham Alabama 35229 USA
| | - Shan Xue
- Department of Chemistry, Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA
| | - Dakota Jones
- Department of Chemistry, Texas A &M University College Station Texas 77843 USA
| | - Yisong Guo
- Department of Chemistry, Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA
| | - Brad S Pierce
- Department of Chemistry & Biochemistry, University of Alabama Tuscaloosa Alabama 35487 USA
| | - Kim R Dunbar
- Department of Chemistry, Texas A &M University College Station Texas 77843 USA
| | - Michael B Hall
- Department of Chemistry, Texas A &M University College Station Texas 77843 USA
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Zhang F, Woods TJ, Rauchfuss TB. Hybrids of [FeFe]- and [NiFe]-H 2ase Active Site Models. Organometallics 2023; 42:1607-1614. [PMID: 37928214 PMCID: PMC10624399 DOI: 10.1021/acs.organomet.3c00173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
Complexes of the type (diphosphine)Ni(μ-SR)2Fe(CO)3 are investigated with azadithiolate (adt, HN(CH2S-)2) as the dithiolate. The resulting complexes are hybrid models for the active sites of the [NiFe]- and [FeFe]-hydrogenases. The key complex (dppv)Ni(μ-adt)Fe(CO)3 (3) was prepared from the complex Ni[(SCH2)2NCbz](dppv), which contains a Cbz-protected adt ligand (Cbz = C(O)OCH2Ph, dppv = cis-1,2-(Ph2P)2C2H2). This complex combines with Fe2(CO)9 to give (dppv)Ni[(μ-SCH2)2NCbz]Fe(CO)3, which is readily deprotected to give 3. Complex 3 undergoes protonation at both Fe and N to give successively [(dppv)Ni(μ-adt)FeH(CO)3]+ ([H3]+) and [(dppv)Ni(μ-adtH)FeH(CO)3]2+ ([H3H]2+). The redox properties and dynamics of these complexes resemble previously reported analogues with propanedithiolate. Solutions of [H3]+ readily degrade to [(dppv)Ni[(μ-SCH2)2NCH2]Fe(CO)3]+ ([4]+), which features a methylene group linking N and Fe. Complex [4]+ can be made in high yield by reaction of [H3]+ with CH2O, and this conversion was also demonstrated with 13CH2O. Complex [4]+ undergoes hydrogenolysis by photochemical reaction with H2 to give [(dppv)Ni[(μ-SCH2)2NMe]FeH(CO)3]+, the N-methylated analogue of [H3]+. Upon treatment ith Me3O+, [4]+ undergoes quaternization, giving [(dppv)Ni[(μ-SCH2)2N(Me)CH2]Fe(CO)3]2+. In contrast with the lability of [H3]+, the phosphine-substituted derivative [(dppv)Ni(μ-adt)FeH(CO)2(PPh3)]+ did not degrade. Most complexes were characterized by X-ray crystallography.
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Affiliation(s)
- Fanjun Zhang
- School of Chemical Sciences, University of Illinois, Urbana, Illinois 61801, United States; Present Address: School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, China (F.Z.)
| | - Toby J Woods
- School of Chemical Sciences, University of Illinois, Urbana, Illinois 61801, United States
| | - Thomas B Rauchfuss
- School of Chemical Sciences, University of Illinois, Urbana, Illinois 61801, United States
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Elsby MR, Baker RT. Through the Looking Glass: Using the Lens of [SNS]-Pincer Ligands to Examine First-Row Metal Bifunctional Catalysts. Acc Chem Res 2023; 56:798-809. [PMID: 36921212 DOI: 10.1021/acs.accounts.2c00798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Abstract
ConspectusHomogeneous catalysis is at the forefront of global efforts to innovate the synthesis of fine chemicals and achieve carbon-neutrality in energy applications. For decades, the push toward sustainable catalysis has focused on the development of first-row transition metal catalysts to supplant widespread use of precious metals. Metal-ligand cooperativity is an effective strategy to yield high-performing first-row metal molecular catalysts. Despite remarkable progress, state of the art catalysts often employ phosphorus-based ligands which are air-sensitive, potentially toxic, and on occasion offset the cost-savings of the metal. Thus, the development of simple and economical ligands composed of biomimetic donors should be a key focus that cannot be overlooked in the pursuit of sustainable catalyst candidates. This is an Account of our group's efforts to develop first-row transition metal complexes which use [SNS]-pincer ligands for bifunctional catalysis. We have synthesized two potentially tridentate ligands, one bearing an amido and two thioether donors [(SMeNSMe), L1] and one which includes thiolate, imine, and thioether donors [(SNSMe), L2], and used them as platforms upon which to explore the reaction pathways of first-row metals. The [SNS] ligand, L1, leads to formation of high-spin paramagnetic metal complexes of the type M(L1)2 in which the 6-membered ring thioether donor is hemilabile (M = Mn, Fe, Co). This allows Mn(L1)2 to function as a carbonyl hydroboration catalyst that operates by a novel hydride-free, inner-sphere reaction pathway. Exploring the reactivity of L2 with Fe and Ni revealed unique coordination chemistry and a variety of mono-, di-, tri-, and tetranuclear complexes enabled by bridging thiolates. Further studies showed L2 undergoes selective Caryl-S bond cleavage upon coordination to a metal with electron-rich phosphine donors, yielding a new (CNS)2- pincer ligand. The analogous reaction with L1 afforded a new (CNSMe)- pincer ligand via both Caryl-S and benzylic C-H bond cleavage. In an attempt to prepare Fe(L2)2, we obtained instead an Fe(N2S3) complex in which imine C-C bond formation affords a potentially hexadentate redox-active ligand. The Fe(N2S3) complex is a selective catalyst for hydroboration of aldehydes and appears to operate through a complicated mechanism. In contrast, a mechanistic study of Mn(L2)(CO)3-photocatalyzed dihydroboration of nitriles indicated that both the flexibility of the κ3-SNSMe ligand (fac- vs mer-coordination) and ability of Mn to undergo a spin-state change are required to access low energy barriers for this transformation. To effectively compare the reactivity of the thiolate vs amido donor, we prepared two Cu complexes, Cu(L1)(IPr) and Cu(L2)(IPr) [IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene], showing that, while both served as carbonyl hydroboration catalysts, only the amido complex was an effective catalyst for carbonyl hydrosilylation. In addition, complexes of the type Zn(L1)2, Zn(L2)2, and Zn(L1)(L2), were also effective for catalytic carbonyl hydroboration. While Zn(L1)(L2) was most active, catalyst speciation studies showed that each undergoes bifunctional catalyst activation to form a Zn bis(alkoxide) catalyst. Overall, our observations using [SNS] ligands with first-row transition metals show how the absence of traditional phosphine donors leads to different fundamental reactivity. Furthermore, this Account demonstrates the gap of knowledge which exists in understanding the reactivity of sulfur-based ligands to promote more widespread adoption of sustainable ligands.
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Affiliation(s)
- Matthew R Elsby
- Department of Chemistry, Yale University, 225 Prospect St, New Haven, Connecticut 06520 United States
| | - R Tom Baker
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, 30 Marie Curie, University of Ottawa, Ottawa, ON K1N 6N5 Canada
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11
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Taut J, Chambron J, Kersting B. Fifty Years of Inorganic Biomimetic Chemistry: From the Complexation of Single Metal Cations to Polynuclear Metal Complexes by Multidentate Thiolate Ligands. Eur J Inorg Chem 2023. [DOI: 10.1002/ejic.202200739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Affiliation(s)
- Josef Taut
- Institut für Anorganische Chemie Universität Leipzig Johannisallee 29 04103 Leipzig Germany
- Institut de Chimie de Strasbourg UMR 7177 CNRS-Université de Strasbourg 1, rue Blaise Pascal 67008 Strasbourg France
| | - Jean‐Claude Chambron
- Institut de Chimie de Strasbourg UMR 7177 CNRS-Université de Strasbourg 1, rue Blaise Pascal 67008 Strasbourg France
| | - Berthold Kersting
- Institut für Anorganische Chemie Universität Leipzig Johannisallee 29 04103 Leipzig Germany
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12
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Salamatian AA, Bren KL. Bioinspired and biomolecular catalysts for energy conversion and storage. FEBS Lett 2023; 597:174-190. [PMID: 36331366 DOI: 10.1002/1873-3468.14533] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/25/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022]
Abstract
Metalloenzymes are remarkable for facilitating challenging redox transformations with high efficiency and selectivity. In the area of alternative energy, scientists aim to capture these properties in bioinspired and engineered biomolecular catalysts for the efficient and fast production of fuels from low-energy feedstocks such as water and carbon dioxide. In this short review, efforts to mimic biological catalysts for proton reduction and carbon dioxide reduction are highlighted. Two important recurring themes are the importance of the microenvironment of the catalyst active site and the key role of proton delivery to the active site in achieving desired reactivity. Perspectives on ongoing and future challenges are also provided.
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Affiliation(s)
| | - Kara L Bren
- Department of Chemistry, University of Rochester, NY, USA
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13
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Metal coordinated macrocyclic complexes in different chemical transformations. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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14
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Guerrero-Almaraz P, Quiroz M, Darensbourg MY. Structural analysis of heteropolymetallic complexes: A chiral pinwheel {Cr[Ni(N2S2)]3}3+ and the {trans-(MeCN)Cr(NO)[Ni(N2S2)]2}2+ basket. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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15
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Quiroz M, Lockart MM, Saber MR, Vali SW, Elrod LC, Pierce BS, Hall MB, Darensbourg MY. Cooperative redox and spin activity from three redox congeners of sulfur-bridged iron nitrosyl and nickel dithiolene complexes. Proc Natl Acad Sci U S A 2022; 119:e2201240119. [PMID: 35696567 PMCID: PMC9233302 DOI: 10.1073/pnas.2201240119] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 05/06/2022] [Indexed: 12/15/2022] Open
Abstract
The synthesis of sulfur-bridged Fe-Ni heterobimetallics was inspired by Nature's strategies to "trick" abundant first row transition metals into enabling 2-electron processes: redox-active ligands (including pendant iron-sulfur clusters) and proximal metals. Our design to have redox-active ligands on each metal, NO on iron and dithiolene on nickel, resulted in the observation of unexpectedly intricate physical properties. The metallodithiolate, (NO)Fe(N2S2), reacts with a labile ligand derivative of [NiII(S2C2Ph2)]0, NiDT, yielding the expected S-bridged neutral adduct, FeNi, containing a doublet {Fe(NO)}7. Good reversibility of two redox events of FeNi led to isolation of reduced and oxidized congeners. Characterization by various spectroscopies and single-crystal X-ray diffraction concluded that reduction of the FeNi parent yielded [FeNi]-, a rare example of a high-spin {Fe(NO)}8, described as linear FeII(NO-). Mössbauer data is diagnostic for the redox change at the {Fe(NO)}7/8 site. Oxidation of FeNi generated the 2[FeNi]+⇌[Fe2Ni2]2+ equilibrium in solution; crystallization yields only the [Fe2Ni2]2+ dimer, isolated as PF6- and BArF- salts. The monomer is a spin-coupled diradical between {Fe(NO)}7 and NiDT+, while dimerization couples the two NiDT+ via a Ni2S2 rhomb. Magnetic susceptibility studies on the dimer found a singlet ground state with a thermally accessible triplet excited state responsible for the magnetism at 300 K (χMT = 0.67 emu·K·mol-1, µeff = 2.31 µB), and detectable by parallel-mode EPR spectroscopy at 20 to 50 K. A theoretical model built on an H4 chain explains this unexpected low energy triplet state arising from a combination of anti- and ferromagnetic coupling of a four-radical molecular conglomerate.
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Affiliation(s)
- Manuel Quiroz
- Department of Chemistry, Texas A&M University, College Station, TX 77843
| | - Molly M. Lockart
- Department of Chemistry & Biochemistry, Samford University, Birmingham, AL 35229
| | - Mohamed R. Saber
- Chemistry Department, Faculty of Science, Fayoum University, Fayoum 63514, Egypt
| | - Shaik Waseem Vali
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77845
| | - Lindy C. Elrod
- Department of Chemistry, Texas A&M University, College Station, TX 77843
| | - Brad S. Pierce
- Department of Chemistry & Biochemistry, University of Alabama, Tuscaloosa, AL 35487
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, College Station, TX 77843
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Chatenet M, Pollet BG, Dekel DR, Dionigi F, Deseure J, Millet P, Braatz RD, Bazant MZ, Eikerling M, Staffell I, Balcombe P, Shao-Horn Y, Schäfer H. Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments. Chem Soc Rev 2022; 51:4583-4762. [PMID: 35575644 PMCID: PMC9332215 DOI: 10.1039/d0cs01079k] [Citation(s) in RCA: 196] [Impact Index Per Article: 98.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Indexed: 12/23/2022]
Abstract
Replacing fossil fuels with energy sources and carriers that are sustainable, environmentally benign, and affordable is amongst the most pressing challenges for future socio-economic development. To that goal, hydrogen is presumed to be the most promising energy carrier. Electrocatalytic water splitting, if driven by green electricity, would provide hydrogen with minimal CO2 footprint. The viability of water electrolysis still hinges on the availability of durable earth-abundant electrocatalyst materials and the overall process efficiency. This review spans from the fundamentals of electrocatalytically initiated water splitting to the very latest scientific findings from university and institutional research, also covering specifications and special features of the current industrial processes and those processes currently being tested in large-scale applications. Recently developed strategies are described for the optimisation and discovery of active and durable materials for electrodes that ever-increasingly harness first-principles calculations and machine learning. In addition, a technoeconomic analysis of water electrolysis is included that allows an assessment of the extent to which a large-scale implementation of water splitting can help to combat climate change. This review article is intended to cross-pollinate and strengthen efforts from fundamental understanding to technical implementation and to improve the 'junctions' between the field's physical chemists, materials scientists and engineers, as well as stimulate much-needed exchange among these groups on challenges encountered in the different domains.
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Affiliation(s)
- Marian Chatenet
- University Grenoble Alpes, University Savoie Mont Blanc, CNRS, Grenoble INP (Institute of Engineering and Management University Grenoble Alpes), LEPMI, 38000 Grenoble, France
| | - Bruno G Pollet
- Hydrogen Energy and Sonochemistry Research group, Department of Energy and Process Engineering, Faculty of Engineering, Norwegian University of Science and Technology (NTNU) NO-7491, Trondheim, Norway
- Green Hydrogen Lab, Institute for Hydrogen Research (IHR), Université du Québec à Trois-Rivières (UQTR), 3351 Boulevard des Forges, Trois-Rivières, Québec G9A 5H7, Canada
| | - Dario R Dekel
- The Wolfson Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel
- The Nancy & Stephen Grand Technion Energy Program (GTEP), Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Fabio Dionigi
- Department of Chemistry, Chemical Engineering Division, Technical University Berlin, 10623, Berlin, Germany
| | - Jonathan Deseure
- University Grenoble Alpes, University Savoie Mont Blanc, CNRS, Grenoble INP (Institute of Engineering and Management University Grenoble Alpes), LEPMI, 38000 Grenoble, France
| | - Pierre Millet
- Paris-Saclay University, ICMMO (UMR 8182), 91400 Orsay, France
- Elogen, 8 avenue du Parana, 91940 Les Ulis, France
| | - Richard D Braatz
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Martin Z Bazant
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - Michael Eikerling
- Chair of Theory and Computation of Energy Materials, Division of Materials Science and Engineering, RWTH Aachen University, Intzestraße 5, 52072 Aachen, Germany
- Institute of Energy and Climate Research, IEK-13: Modelling and Simulation of Materials in Energy Technology, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Iain Staffell
- Centre for Environmental Policy, Imperial College London, London, UK
| | - Paul Balcombe
- Division of Chemical Engineering and Renewable Energy, School of Engineering and Material Science, Queen Mary University of London, London, UK
| | - Yang Shao-Horn
- Research Laboratory of Electronics and Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Helmut Schäfer
- Institute of Chemistry of New Materials, The Electrochemical Energy and Catalysis Group, University of Osnabrück, Barbarastrasse 7, 49076 Osnabrück, Germany.
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Zhao J, Shi Q, Song D, Li B, Ren H, Zhang D, Sun X, Li J, Wang N. Effect of the NiN2S2 Metallothiolate Ligands on the Preparation, Structure, and Property of Dinickel Complexes Related to [NiFe]-Hydrogenases Active Site. Catal Letters 2022. [DOI: 10.1007/s10562-021-03627-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Zhao T, Ji M, Wang P, Li S, Pu X, Yang M. Polymorphism in acetyl-CoA synthase mimic complex [NiN2S2-(W(CO)5)2]. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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19
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Basu D, Gray DL, Woods TJ, Rauchfuss TB, Arrigoni F, Zampella G. Challenges in the Synthesis of Active Site Mimics for [NiFe]-Hydrogenases. Organometallics 2021; 40:3306-3312. [PMID: 37933322 PMCID: PMC10627515 DOI: 10.1021/acs.organomet.1c00412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
One of the more active areas in bioorganometallic chemistry is the preparation and reactivity studies of active site mimics of the [NiFe]-hydrogenases. One area of particular recent progress involves reactions that interconvert Ni(μ-X)Fe centers for X = OH, H, CO, as described by Song et al. Such reactions illustrate new ways to access intermediates related to the Ni-R and Ni-SI states of the enzyme. Most models are derivatives of the type (diphosphine)Ni(SR)2Fe(CO)3-n(PR'3)n. In recent work, the methodology has been generalized to include FeII(diphosphine) derivatives of Ni(N2S2), where N2S22- is the tetradentate diamine-dithiolate (CH2N(CH3)CH2CH2S-)2. Indeed, models based on Ni(N2S2) have proven valuable, but these studies also highlight challenges in working with heterobimetallic complexes, specifically the tendency of some such Ni-Fe complexes to convert to homometalliic Ni-Ni derivatives. This kind of problem is not readily detected by X-ray crystallography. With this caution in mind, we argue that one series of complexes recently described in this journal are almost certainly misassigned.
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Affiliation(s)
- Debashis Basu
- School of Chemical Sciences, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Danielle L Gray
- School of Chemical Sciences, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Toby J Woods
- School of Chemical Sciences, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Thomas B Rauchfuss
- School of Chemical Sciences, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United State
| | - Federica Arrigoni
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy
| | - Giuseppe Zampella
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy
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Lü S, Gong S, Qin CR, Li QL. Synthesis, characterization and electrochemical properties of phosphine-disubstituted diiron bis(monoselenolate) carbonyls. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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21
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Gonzaga de França Lopes L, Gouveia Júnior FS, Karine Medeiros Holanda A, Maria Moreira de Carvalho I, Longhinotti E, Paulo TF, Abreu DS, Bernhardt PV, Gilles-Gonzalez MA, Cirino Nogueira Diógenes I, Henrique Silva Sousa E. Bioinorganic systems responsive to the diatomic gases O2, NO, and CO: From biological sensors to therapy. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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22
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Itai T, Kuwamura N, Kojima T, Yoshinari N, Rujiwatra A, Konno T. Photoluminescent Ionic Solids of S-Bridged Gold(I)-Gallium(III) and Gold(I)-Indium(III) Hexanuclear Complexes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takuma Itai
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Naoto Kuwamura
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Tatsuhiro Kojima
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Nobuto Yoshinari
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Apinpus Rujiwatra
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Takumi Konno
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Albkuri YM, Ovens JS, Martin J, Baker RT. Nickel(II)-SNS Thiolate Complexes: Reactivity and Solution Dynamics. Inorg Chem 2021; 60:10934-10942. [PMID: 34242000 DOI: 10.1021/acs.inorgchem.1c00446] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Nickel coordination chemistry with a biomimetic thiolate-imine-thioether SNSMe ligand is accompanied by diverse reactivity and multidentate ligand dynamics. Reaction of Ni(acac)2 with 2 equiv of 2-(methylthio)-phenyl-benzothiazolidine (MPB) affords the bis(arylimino-phenylene-thiolate) complex Ni(κ2-SNSMe)2 (1; acac = acetylacetonate). Thermolysis of 1 in refluxing toluene is accompanied by imine C-C bond formation, yielding [Ni(N2S2)] (2) with a redox-active ligand. Protonation of 1 with NHTf2 at a low temperature released 1 equiv of MPB, yielding crystals of the dimeric dication {[Ni(μ-κ3-SNSMe)]2}(NTf2)2 (3; Tf = SO2CF3) in high yield. In contrast, the same reaction at room temperature gave also paramagnetic complexes {Ni[μ-Ni(κ3-SNSMe)2]2}(NTf2)2 (4) and {Ni[μ-Ni(κ3-SNSMe)2]3}(NTf2)2 (5) that feature coordination of two or three pseudo-octahedral, paramagnetic Ni(κ3-SNSMe)2 units to a central Ni(II) dication via thiolate bridges. Remarkably, dissolution of 3 in a variety of solvents, including weakly coordinating CH2Cl2, rapidly generates a mixture of 4 and Ni(NTf)2. Treatment of this mixture with Lewis bases L gave high yields of dimers {[Ni(μ-κ3-SNSMe)L]2}(NTf2)2 for L = CNXylyl (6a) and {[Ni(μ-κ3-SNSMe)]2(μ-dmpm)}(NTf2)2 (6b; dmpm = bis(dimethylphosphino)methane) or monomers [Ni(κ3-SNSMe)L](NTf2) for L = PMe3 (7a) and P(OMe)3 (7b). Addition of 2 equiv of the strong donor N-heterocyclic carbene ligand, IPr, to 3, however, led to thioether demethylation, affording neutral dithiolate complex Ni(κ3-SNS)(IPr) (8). Reaction products were characterized by NMR and mass spectrometry and complexes 1-5, 6a, 6b, 7a, and 8 by single-crystal X-ray diffraction.
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Affiliation(s)
- Yahya M Albkuri
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Jeffrey S Ovens
- Faculty of Science, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Jessica Martin
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - R Tom Baker
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
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Guerrero-Almaraz P, Quiroz M, Reibenspies JH, Darensbourg MY. Linear and Bent Nitric Oxide Ligand Binding in an Asymmetric Butterfly Complex: CoMoCo'. Inorg Chem 2021; 60:15975-15979. [PMID: 34157221 DOI: 10.1021/acs.inorgchem.1c00987] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two synthetic approaches to install metallodithiolate ligands on molybdenum centers using the synthons [Mo2(CH3CN)10]4+ and (N2S2)Co(NO) [N2S2 = N,N-bis(2-mercaptoethyl)-1,4-diazacycloheptane and NO = nitric oxide], or [Mo(NO)2(CH3CN)4]2+ (CH3CN = acetonitrile) and [(N2S2)Co]2 lead to a bis-nitrosylated, trimetallic dication, CoMoCo'. This unique asymmetric butterfly complex, with S = 1, has a bent NO within the small {Co(NO)}8 wing (denoted as Co), reflecting CoIII(NO-), and is S-bridged to a linear {Mo(NO)}6 diamagnetic unit. The latter is further S-bridged to a pentacoordinate (N2S2)CoIII(CH3CN) donor in the larger wing and is the origin of the two unpaired electrons, denoted as Co'. The asymmetry in Mo-Co distances, 3.33 Å in the Co wing and 2.73 Å in the Co' wing, indicated a Mo-Co' bonding interaction. The transfer of NO from (N2S2)Co(NO) in the former path is needed to cleave the strong quadruple bond in [Mo≣Mo]4+, with the energetic cost compensated for via a one-electron bond between Mo and Co', as indicated by natural bonding orbital analysis.
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Affiliation(s)
| | - Manuel Quiroz
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Joseph H Reibenspies
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Marcetta Y Darensbourg
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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Nayak M, Joshi DK, Kumar K, Singh AS, Tiwari VK, Bhattacharya S. Synthesis of a Series of a Few Hydrosulfide Complexes of Cu(I). A μ 3-SH-Bridged Rare Cubane-like Tetramer Showing Efficient Catalytic Activity toward Azide-Alkyne Cycloaddition. Inorg Chem 2021; 60:8075-8084. [PMID: 34018726 DOI: 10.1021/acs.inorgchem.1c00628] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A cubane-like tetranuclear hydrosulfido complex of Cu(I), [Cu4(SH)4(PPh3)4] (1), has been synthesized by the reaction of Cu(NO3)2·3H2O, NaSCOPh, and Cu(PPh3)2NO3 and characterized structurally. Complex 1 represents the first example of crystallographically characterized μ3-SH-bridged cubanoid hydrosulfide. By direct reactions of [(PPh3)2Cu(NO3)] and NaSH, neutral hydrosulfide complexes [Cu(SH)(PPh3)2]·C6H6 (2), [Cu2(SH)2(PPh3)3] (3), and [Cu2(SH)2(PPh3)4] (4) have also been synthesized and structurally characterized. Complex 2 is monomeric with a terminal hydrosulfide ligand. The other two, 3 and 4, are μ2-SH-bridged unsymmetrical and symmetrical dinuclear complexes, respectively. In the symmetric one (4), both Cu(I) ions are tetrahedrally coordinated while in the unsymmetric one (3), one Cu(I) ion is tetrahedral and the other one has a trigonal-planar coordination geometry. The catalytic activity of a hydrosulfido complex in a "click" azide-alkyne cycloaddition reaction has been explored for the first time, and complex 1 is found to be an efficient catalyst for the regioselective synthesis of glycoconjugate triazoles.
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Affiliation(s)
- Mousumi Nayak
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Deepak K Joshi
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Krishna Kumar
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Anoop S Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Vinod K Tiwari
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Subrato Bhattacharya
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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Schmorl S, Naumov S, Abel B, Börner M, Pöppl A, Kersting B. Metalloligands based on Robson-type amino-thiophenolato macrocycles for assembly of heterotrimetallic complexes. Dalton Trans 2021; 50:5784-5788. [PMID: 33890608 DOI: 10.1039/d1dt00723h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ability of macrocyclic Co and Ni aminothiolate complexes to act as metalloligands towards cuprate ions was established. Adduct formation is enabled by a thiolate-to-Cu+ charge transfer (CT) interaction giving stable heterotrimetallics with magnetic properties.
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Affiliation(s)
- Sara Schmorl
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany.
| | - Sergej Naumov
- Leibniz-Institut für Oberflächenmodifizierung (IOM), Abteilung Funktionale Oberflächen, Permoserstr. 15, D-04318 Leipzig, Germany
| | - Bernd Abel
- Leibniz-Institut für Oberflächenmodifizierung (IOM), Abteilung Funktionale Oberflächen, Permoserstr. 15, D-04318 Leipzig, Germany and Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstraße 2, D-04103 Leipzig, Germany
| | - Martin Börner
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany. and Leibniz-Institut für Oberflächenmodifizierung (IOM), Abteilung Funktionale Oberflächen, Permoserstr. 15, D-04318 Leipzig, Germany
| | - Andreas Pöppl
- Fakultät für Physik und Geowissenschaften, Linnestr.3, D-04103 Leipzig, Germany
| | - Berthold Kersting
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany.
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27
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Man Ngo F, Tse ECM. Bioinorganic Platforms for Sensing, Biomimicry, and Energy Catalysis. CHEM LETT 2021. [DOI: 10.1246/cl.200875] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Fung Man Ngo
- Department of Chemistry, CAS-HKU Joint Laboratory of Metallomics on Health and Environment, University of Hong Kong, Hong Kong SAR, P. R. China
- Advanced Functional Materials Laboratory, HKU Zhejiang Institute of Research and Innovation, Zhejiang 311305, P. R. China
| | - Edmund C. M. Tse
- Department of Chemistry, CAS-HKU Joint Laboratory of Metallomics on Health and Environment, University of Hong Kong, Hong Kong SAR, P. R. China
- Advanced Functional Materials Laboratory, HKU Zhejiang Institute of Research and Innovation, Zhejiang 311305, P. R. China
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28
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Drosou M, Zarkadoulas A, Bethanis K, Mitsopoulou CA. Structural modifications on nickel dithiolene complexes lead to increased metal participation in the electrocatalytic hydrogen evolution mechanism. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1918339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Maria Drosou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Athens, Greece
| | - Athanasios Zarkadoulas
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Athens, Greece
| | - Kostas Bethanis
- Physics Laboratory, Department of Biotechnology, Agricultural University of Athens, Athens, Greece
| | - Christiana A. Mitsopoulou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Athens, Greece
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29
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Song LC, Feng L, Lu Y, Yang XY. Synthesis, Structures, and Reactivity of [NiFe]-H 2ase Mimics Containing One Square-Planar N 2S 2 Ligand Bridged between Their Ni/Fe Centers through One or Two S Atoms. Organometallics 2021. [DOI: 10.1021/acs.organomet.0c00778] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Li-Cheng Song
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Li Feng
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yu Lu
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xi-Yue Yang
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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30
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Ghosh AC, Duboc C, Gennari M. Synergy between metals for small molecule activation: Enzymes and bio-inspired complexes. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213606] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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31
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Kaim V, Kaur-Ghumaan S. Mononuclear Mn complexes featuring N,S-/N,N-donor and 1,3,5-triaza-7-phosphaadamantane ligands: synthesis and electrocatalytic properties. NEW J CHEM 2021. [DOI: 10.1039/d1nj02104d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mononuclear Mn(i) carbonyl complexes incorporating 2-mercaptobenzothiazole or 2-mercaptobenzimidazole and phosphaadamantane ligands were evaluated as electrocatalysts for the HER both in acetonitrile and acetonitrile/water.
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Affiliation(s)
- Vishakha Kaim
- Department of Chemistry, University of Delhi, Delhi 110007, India
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32
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Song D, Gao X, Li B, Li J, Sun X, Li C, Zhao J, Chen L, Wang N. Synthesis, structure and electrocatalytic H2-evoluting activity of a dinickel model complex related to the active site of [NiFe]-hydrogenases. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2020.01.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Prasad P, Selvan D, Chakraborty S. Biosynthetic Approaches towards the Design of Artificial Hydrogen-Evolution Catalysts. Chemistry 2020; 26:12494-12509. [PMID: 32449989 DOI: 10.1002/chem.202001338] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Indexed: 11/07/2022]
Abstract
Hydrogen is a clean and sustainable form of fuel that can minimize our heavy dependence on fossil fuels as the primary energy source. The need of finding greener ways to generate H2 gas has ignited interest in the research community to synthesize catalysts that can produce H2 by the reduction of H+ . The natural H2 producing enzymes hydrogenases have served as an inspiration to produce catalytic metal centers akin to these native enzymes. In this article we describe recent advances in the design of a unique class of artificial hydrogen evolving catalysts that combine the features of the active site metal(s) surrounded by a polypeptide component. The examples of these biosynthetic catalysts discussed here include i) assemblies of synthetic cofactors with native proteins; ii) peptide-appended synthetic complexes; iii) substitution of native cofactors with non-native cofactors; iv) metal substitution from rubredoxin; and v) a reengineered Cu storage protein into a Ni binding protein. Aspects of key design considerations in the construction of these artificial biocatalysts and insights gained into their chemical reactivity are discussed.
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Affiliation(s)
- Pallavi Prasad
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, 38677, USA
| | - Dhanashree Selvan
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, 38677, USA
| | - Saumen Chakraborty
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, 38677, USA
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34
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Gee LB, Pelmenschikov V, Wang H, Mishra N, Liu YC, Yoda Y, Tamasaku K, Chiang MH, Cramer SP. Vibrational characterization of a diiron bridging hydride complex - a model for hydrogen catalysis. Chem Sci 2020; 11:5487-5493. [PMID: 34094075 PMCID: PMC8159291 DOI: 10.1039/d0sc01290d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 05/01/2020] [Indexed: 11/21/2022] Open
Abstract
A diiron complex containing a bridging hydride and a protonated terminal thiolate of the form [(μ,κ2-bdtH)(μ-PPh2)(μ-H)Fe2(CO)5]+ has been investigated through 57Fe nuclear resonance vibrational spectroscopy (NRVS) and interpreted using density functional theory (DFT) calculations. We report the Fe-μH-Fe wagging mode, and indications for Fe-μD stretching vibrations in the D-isotopologue, observed by 57Fe-NRVS. Our combined approach demonstrates an asymmetric sharing of the hydride between the two iron sites that yields two nondegenerate Fe-μH/D stretching vibrations. The studied complex provides an important model relevant to biological hydrogen catalysis intermediates. The complex mimics proposals for the binuclear metal sites in [FeFe] and [NiFe] hydrogenases. It is also an appealing prototype for the 'Janus intermediate' of nitrogenase, which has been proposed to contain two bridging Fe-H-Fe hydrides and two protonated sulfurs at the FeMo-cofactor. The significance of observing indirect effects of the bridging hydride, as well as obstacles in its direct observation, is discussed in the context of biological hydrogen intermediates.
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Affiliation(s)
- Leland B Gee
- Department of Chemistry, Stanford University 333 Campus Drive Stanford CA 94305 USA
| | - Vladimir Pelmenschikov
- Institut für Chemie, Technische Universität Berlin Strasse des 17 Juni 135 10623 Berlin Germany
| | - Hongxin Wang
- SETI Institute 189 Bernardo Avenue Mountain View CA 94043 USA
| | - Nakul Mishra
- Department of Chemistry, University of California, Davis One Shields Ave Davis CA 95616 USA
| | - Yu-Chiao Liu
- Institute of Chemistry, Academia Sinica Nankang Taipei 115 Taiwan
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University Kaohsiung 807 Taiwan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute (JASRI), SPring-8 1-1-1 Kouto, Sayo-gun Hyogo 679-5198 Japan
| | - Kenji Tamasaku
- RIKEN SPring-8 Center 1-1-1 Kouto, Sayo-cho, Sayo-gun Hyogo 679-5148 Japan
| | - Ming-Hsi Chiang
- Institute of Chemistry, Academia Sinica Nankang Taipei 115 Taiwan
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University Kaohsiung 807 Taiwan
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35
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Kariyawasam Pathirana KD, Ghosh P, Hsieh CH, Elrod LC, Bhuvanesh N, Darensbourg DJ, Darensbourg MY. Synthetic Metallodithiolato Ligands as Pendant Bases in [Fe IFe I], [Fe I[Fe(NO)] II], and [(μ-H)Fe IIFe II] Complexes. Inorg Chem 2020; 59:3753-3763. [PMID: 32083850 DOI: 10.1021/acs.inorgchem.9b03409] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The development of ligands with specific stereo- and electrochemical requirements that are necessary for catalyst design challenges synthetic chemists in academia and industry. The crucial aza-dithiolate linker in the active site of [FeFe]-H2ase has inspired the development of synthetic analogues that utilize ligands which serve as conventional σ donors with pendant base features for H+ binding and delivery. Several MN2S2 complexes (M = Ni2+, [Fe(NO)]2+, [Co(NO)]2+, etc.) utilize these cis-dithiolates to bind low valent metals and also demonstrate the useful property of hemilability, i.e., alternate between bi- and monodentate ligation. Herein, synthetic efforts have led to the isolation and characterization of three heterotrimetallics that employ metallodithiolato ligand binding to di-iron scaffolds in three redox levels, (μ-pdt)[Fe(CO)3]2, (μ-pdt)[Fe(CO)3][(Fe(NO))II(IMe)(CO)]+, and (μ-pdt)(μ-H)[FeII(CO)2(PMe3)]2+ to generate (μ-pdt)[(FeI(CO)3][FeI(CO)2·NiN2S2] (1), (μ-pdt)[FeI(CO)3][(Fe(NO))II(IMe)(CO)]+ (2), and (μ-pdt)(μ-H)[FeII(CO)2(PMe3)][FeII(CO)(PMe3)·NiN2S2]+ (3) complexes (pdt = 1,3-propanedithiolate, IMe = 1,3-dimethylimidazole-2-ylidene, NiN2S2 = [N,N'-bis(2-mercaptidoethyl)-1,4-diazacycloheptane] nickel(II)). These complexes display efficient metallodithiolato binding to the di-iron scaffold with one thiolate-S, which allows the free unbound thiolate to potentially serve as a built-in pendant base to direct proton binding, promoting a possible Fe-H-···+H-S coupling mechanism for the electrocatalytic hydrogen evolution reaction (HER) in the presence of acids. Ligand substitution studies on 1 indicate an associative/dissociative type reaction mechanism for the replacement of the NiN2S2 ligand, providing insight into the Fe-S bond strength.
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Affiliation(s)
| | - Pokhraj Ghosh
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Chung-H Hsieh
- Department of Chemistry, Tamkang University, New Taipei City, Taiwan
| | - Lindy Chase Elrod
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Donald J Darensbourg
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Marcetta Y Darensbourg
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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36
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Le T, Nguyen H, Perez LM, Darensbourg DJ, Darensbourg MY. Metal‐Templated, Tight Loop Conformation of a Cys‐X‐Cys Biomimetic Assembles a Dimanganese Complex. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Trung Le
- Department of Chemistry Texas A&M University 3255 TAMU College Station TX 77843 USA
| | - Hao Nguyen
- Department of Chemistry Texas A&M University 3255 TAMU College Station TX 77843 USA
| | - Lisa M. Perez
- Department of Chemistry Texas A&M University 3255 TAMU College Station TX 77843 USA
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37
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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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38
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Tang H, Brothers EN, Grapperhaus CA, Hall MB. Electrocatalytic Hydrogen Evolution and Oxidation with Rhenium Tris(thiolate) Complexes: A Competition between Rhenium and Sulfur for Electrons and Protons. ACS Catal 2020. [DOI: 10.1021/acscatal.9b04579] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hao Tang
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | | | - Craig A. Grapperhaus
- Department of Chemistry, University of Louisville, 2320 South Brook Street, Louisville, Kentucky 40292, United States
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
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39
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Le T, Nguyen H, Perez LM, Darensbourg DJ, Darensbourg MY. Metal-Templated, Tight Loop Conformation of a Cys-X-Cys Biomimetic Assembles a Dimanganese Complex. Angew Chem Int Ed Engl 2020; 59:3645-3649. [PMID: 31851781 DOI: 10.1002/anie.201913259] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Indexed: 11/10/2022]
Abstract
With the goal of generating anionic analogues to MN2 S2 ⋅Mn(CO)3 Br we introduced metallodithiolate ligands, MN2 S2 2- prepared from the Cys-X-Cys biomimetic, ema4- ligand (ema=N,N'-ethylenebis(mercaptoacetamide); M=NiII , [VIV ≡O]2+ and FeIII ) to Mn(CO)5 Br. An unexpected, remarkably stable dimanganese product, (H2 N2 (CH2 C=O(μ-S))2 )[Mn(CO)3 ]2 resulted from loss of M originally residing in the N2 S2 4- pocket, replaced by protonation at the amido nitrogens, generating H2 ema2- . Accordingly, the ema ligand has switched its coordination mode from an N2 S2 4- cavity holding a single metal, to a binucleating H2 ema2- with bridging sulfurs and carboxamide oxygens within Mn-μ-S-CH2 -C-O, 5-membered rings. In situ metal-templating by zinc ions gives quantitative yields of the Mn2 product. By computational studies we compared the conformations of "linear" ema4- to ema4- frozen in the "tight-loop" around single metals, and to the "looser" fold possible for H2 ema2- that is the optimal arrangement for binucleation. XRD molecular structures show extensive H-bonding at the amido-nitrogen protons in the solid state.
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Affiliation(s)
- Trung Le
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
| | - Hao Nguyen
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
| | - Lisa M Perez
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
| | - Donald J Darensbourg
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
| | - Marcetta Y Darensbourg
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX, 77843, USA
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40
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Drosou M, Kamatsos F, Mitsopoulou CA. Recent advances in the mechanisms of the hydrogen evolution reaction by non-innocent sulfur-coordinating metal complexes. Inorg Chem Front 2020. [DOI: 10.1039/c9qi01113g] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review comments on the homogeneous HER mechanisms for catalysts carrying S-non-innocent ligands in the light of experimental and computational data.
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Affiliation(s)
- Maria Drosou
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- Panepistimiopolis
- Greece
| | - Fotios Kamatsos
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- Panepistimiopolis
- Greece
| | - Christiana A. Mitsopoulou
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- Panepistimiopolis
- Greece
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41
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Shiekh BA. Biomimetic heterobimetallic architecture of Ni(ii) and Fe(ii) for CO 2 hydrogenation in aqueous media. A DFT study. RSC Adv 2019; 9:33107-33116. [PMID: 35529114 PMCID: PMC9073165 DOI: 10.1039/c9ra07139c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 10/10/2019] [Indexed: 11/21/2022] Open
Abstract
In this work, density functional theory has been employed to design a heterobimetallic catalyst of Ni(ii) and Fe(ii) for the effective CO2 hydrogenation to HCOOH. Based on computational results, our newly designed catalyst is found to be effective for such conversion reactions with free energy as low as 14.13 kcal mol-1 for the rate determining step. Such a low value of free energy indicates that the NiFe heterobimetallic catalyst can prove to be very efficient for the above said conversion. Moreover, the effects of ligand substitutions at the active metal center and the effects due to various spin states are also explored, and can serve as a great tool for the rational design of NiFe catalyst for CO2 hydrogenation.
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Affiliation(s)
- Bilal Ahmad Shiekh
- Department of Chemistry, UGC Sponsored Centre of Advanced Studies-II, Guru Nanak Dev University Amritsar-143005 India
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42
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Connecting Main-Group Metals (Al, Ga, In) and Tungsten(0) Carbonyls via the N2S2 Metallo-Ligand Strategy. INORGANICS 2019. [DOI: 10.3390/inorganics7090115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Tetradentate N2S2 ligands (such as bismercaptoethanediazacycloheptane in this study) have seen extensive use in combination with transition metals. Well-oriented N2S2 binding sites are ideal for d8 transition metals with square planar preferences, especially NiII, but also as a square pyramidal base for those metals with pentacoordinate preferences, such as [V≡O]2+, [Fe(NO)]2+, and [Co(NO)]2+. Further reactivity at the thiolate sulfurs generates diverse bi, tri, and tetra/heterometallic compounds. Few N2S2 ligands have been explored to investigate the possibility of binding to main group metals, especially group III (MIII) metals, and their utility as synthons for main group/transition metal bimetallic complexes. To open up this area of chemistry, we synthesized three new five-coordinate main group XMN2S2 complexes with methyl as the fifth binding ligand for M = Al, and chloride for M = Ga and In. The seven-membered diazacycle, dach, was engaged as a rigid stabilized connector between the terminal thiolate sulfurs. The pentacoordinate XMN2S2 complexes were characterized by 1H-NMR, 13C-NMR, +ESI-Mass spectra, and X-ray diffraction. Their stabilities and reactivities were probed by adding NiII sources and W(CO)5(THF). The former replaces the main group metals in all cases in the N2S2 coordination environment, demonstrating the weak coordinate bonds of MIII–N/S. The reaction of XMN2S2 (XM = ClGaIII or ClInIII) with the labile ligand W(0) complex W(CO)5(THF) resulted in Ga/In–W bimetallic complexes with a thiolate S-bridge. The synthesis of XMN2S2 complexes provide examples of MIII–S coordination, especially Al–S, which is relatively rare. The bimetallic Ga/In–S–W complex formation indicates that the nucleophilic ability of sulfur is retained in MIII–S–R, resulting in the ability of main group MIII–N2S2 complexes to serve as metalloligands.
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43
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Selvan D, Prasad P, Farquhar ER, Shi Y, Crane S, Zhang Y, Chakraborty S. Redesign of a Copper Storage Protein into an Artificial Hydrogenase. ACS Catal 2019; 9:5847-5859. [PMID: 31341700 DOI: 10.1021/acscatal.9b00360] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We report the construction of an artificial hydrogenase (ArH) by reengineering a Cu storage protein (Cspl) into a Ni-binding protein (NBP) employing rational metalloprotein design. The hypothesis driven design approach involved deleting existing Cu sites of Csp1 and identification of a target tetrathiolate Ni binding site within the protein scaffold followed by repacking the hydrophobic core. Guided by modeling, the NBP was expressed and purified in high purity. NBP is a well-folded and stable construct displaying native-like unfolding behavior. Spectroscopic and computational studies indicated that the NBP bound nickel in a distorted square planar geometry that validated the design. Ni(II)-NBP is active for photo-induced H2 evolution following a reductive quenching mechanism. Ni(II)-NBP catalyzed H+ reduction to H2 gas electrochemically as well. Analysis of the catalytic voltammograms established a proton-coupled electron transfer (PCET) mechanism. Electrolysis studies confirmed H2 evolution with quantitative Faradaic yields. Our studies demonstrate an important scope of rational metalloprotein design that allows imparting functions into protein scaffolds that have natively not evolved to possess the same function of the target metalloprotein constructs.
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Affiliation(s)
- Dhanashree Selvan
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Pallavi Prasad
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Erik R. Farquhar
- Case Western Reserve University Center for Synchrotron Biosciences, NSLS-II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Yelu Shi
- Department of Chemistry and Chemical Biology, Stevens Institute of Technology, 1 Castle Point on Hudson, Hoboken, New Jersey 07030, United States
| | - Skyler Crane
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Yong Zhang
- Department of Chemistry and Chemical Biology, Stevens Institute of Technology, 1 Castle Point on Hudson, Hoboken, New Jersey 07030, United States
| | - Saumen Chakraborty
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States
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Keegan BC, Ocampo D, Shearer J. pH Dependent Reversible Formation of a Binuclear Ni 2 Metal-Center Within a Peptide Scaffold. INORGANICS 2019; 7:90. [PMID: 38046130 PMCID: PMC10691859 DOI: 10.3390/inorganics7070090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023] Open
Abstract
A disulfide-bridged peptide containing two Ni2+ binding sites based on the nickel superoxide dismutase protein, {Ni2(SODmds)}, has been prepared. At physiological pH (7.4) it was found that the metal sites are mononuclear with a square planar NOS2 coordination environment with the two sulfur-based ligands derived from cysteinate residues, the nitrogen ligand derived from the amide backbone and a water ligand. Furthermore, S K-edge X-ray absorption spectroscopy indicated that the two cysteinate sulfur atoms ligated to nickel are each protonated. Elevation of the pH to 9.6 results in the deprotonation of the cysteinate sulfur atoms, and yields a binuclear, cysteinate bridged Ni22+ center with each nickel contained in a distorted square planar geometry. At both pH = 7.4 and 9.6 the nickel sites are moderately air sensitive, yielding intractable oxidation products. However, at pH = 9.6 {Ni2(SODmds)} reacts with O2 at an ~3.5-fold faster rate than at pH = 7.4. Electronic structure calculations indicate the reduced reactivity at pH = 7.4 is a result of a reduction in S(3p) character and deactivation of the nucleophilic frontier molecular orbitals upon cysteinate sulfur protonation.
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Affiliation(s)
- Brenna C. Keegan
- Department of Chemistry, Trinity University, 1 Trinity Place, San Antonio, TX 78212, U.S.A
| | - Daniel Ocampo
- Department of Chemistry, Trinity University, 1 Trinity Place, San Antonio, TX 78212, U.S.A
| | - Jason Shearer
- Department of Chemistry, Trinity University, 1 Trinity Place, San Antonio, TX 78212, U.S.A
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Arnet NA, Bhuvanesh N, Darensbourg MY. Proton affinity studies of nickel N 2S 2 complexes and control of aggregation. J Biol Inorg Chem 2019; 24:909-917. [PMID: 31175446 DOI: 10.1007/s00775-019-01671-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 05/22/2019] [Indexed: 10/26/2022]
Abstract
The thiolate ligands of [NiFe]-H2ase enzymes have been implicated as proton-binding sites for the reduction/oxidation of H+/H2. This study examines the ligand effect on reactivity of NiN2S2 complexes with an array of acids in methanol solution. UV-Vis absorption spectroscopy is utilized to observe the transformation from the monomeric species to a trimetallic complex that is formed after proton-induced ligand dissociation. Nickel complexes with a flexible (propyl and ethyl) N to N linker were found to readily form the trimetallic complex with acids as weak as ammonium (pKa = 10.9 in methanol). A more constrained nickel complex with a diazacycloheptane N to N linker required stronger acids such as 2,2-dichloroacetic acid (pKa = 6.38 in methanol) to form the trimetallic complex and featured the formation of an NiN2S2H+ complex with acetic acid (pKa = 9.63 in methanol). The most strained ligand, which featured a diazacyclohexane backbone, readily dissociated from the nickel center upon mixture with acids with pKa ≤ 9.63 and showed no evidence of a trimetallic species with any acid. This research highlights the dramatic differences in reactivity with proton sources that can be imparted by minor alterations to ligand geometry and strain.
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Affiliation(s)
- Nicholas A Arnet
- Department of Chemistry, Texas A&M University, College Station, TX, 77840, USA
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, College Station, TX, 77840, USA
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46
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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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Ikeda K, Hori Y, Mahyuddin MH, Shiota Y, Staykov A, Matsumoto T, Yoshizawa K, Ogo S. Dual Catalytic Cycle of H2 and H2O Oxidations by a Half-Sandwich Iridium Complex: A Theoretical Study. Inorg Chem 2019; 58:7274-7284. [DOI: 10.1021/acs.inorgchem.9b00307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Kei Ikeda
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Yuta Hori
- Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | | | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Aleksandar Staykov
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan
| | - Takahiro Matsumoto
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan
- Center for Small Molecule Energy, Kyushu University, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Seiji Ogo
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan
- Center for Small Molecule Energy, Kyushu University, Fukuoka 819-0395, Japan
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48
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Basu D, Bailey TS, Lalaoui N, Richers CP, Woods TJ, Rauchfuss TB, Arrigoni F, Zampella G. Synthetic Designs and Structural Investigations of Biomimetic Ni-Fe Thiolates. Inorg Chem 2019; 58:2430-2443. [PMID: 30707014 DOI: 10.1021/acs.inorgchem.8b02991] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Described are the syntheses of several Ni(μ-SR)2Fe complexes, including hydride derivatives, in a search for improved models for the active site of [NiFe]-hydrogenases. The nickel(II) precursors include (i) nickel with tripodal ligands: Ni(PS3)- and Ni(NS3)- (PS33- = tris(phenyl-2-thiolato)phosphine, NS33- = tris(benzyl-2-thiolato)amine), (ii) traditional diphosphine-dithiolates, including chiral diphosphine R,R-DIPAMP, (iii) cationic Ni(phosphine-imine/amine) complexes, and (iv) organonickel precursors Ni( o-tolyl)Cl(tmeda) and Ni(C6F5)2. The following new nickel precursor complexes were characterized: PPh4[Ni(NS3)] and the dimeric imino/amino-phosphine complexes [NiCl2(PCH═NAn)]2 and [NiCl2(PCH2NHAn)]2 (P = Ph2PC6H4-2-). The iron(II) reagents include [CpFe(CO)2(thf)]BF4, [Cp*Fe(CO)(MeCN)2]BF4, FeI2(CO)4, FeCl2(diphos)(CO)2, and Fe(pdt)(CO)2(diphos) (diphos = chelating diphosphines). Reactions of the nickel and iron complexes gave the following new Ni-Fe compounds: Cp*Fe(CO)Ni(NS3), [Cp(CO)Fe(μ-pdt)Ni(dppbz)]BF4, [( R,R-DIPAMP)Ni(μ-pdt)(H)Fe(CO)3]BArF4, [(PCH═NAn)Ni(μ-pdt)(Cl)Fe(dppbz)(CO)]BF4, [(PCH2NHAn)Ni(μ-pdt)(Cl)Fe(dppbz)(CO)]BF4, [(PCH═NAn)Ni(μ-pdt)(H)Fe(dppbz)(CO)]BF4, [(dppv)(CO)Fe(μ-pdt)]2Ni, {H[(dppv)(CO)Fe(μ-pdt)]2Ni]}BF4, and (C6F5)2Ni(μ-pdt)Fe(CO)2(dppv) (DIPAMP = (CH2P(C6H4-2-OMe)2)2; BArF4- = [B(C6H3-3,5-(CF3)2]4-)) Within the context of Ni-(SR)2-Fe complexes, these new complexes feature new microenvironments for the nickel center: tetrahedral Ni, chirality, imine, and amine coligands, and Ni-C bonds. In the case of {H[(dppv)(CO)Fe(μ-pdt)]2Ni}+, four low-energy isomers are separated by ≤3 kcal/mol, one of which features a biomimetic HNi(SR)4 site, as supported by density functional theory calculations.
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Affiliation(s)
- Debashis Basu
- School of Chemical Sciences , University of Illinois , Urbana , Illinois 61801 , United States
| | - T Spencer Bailey
- School of Chemical Sciences , University of Illinois , Urbana , Illinois 61801 , United States
| | - Noémie Lalaoui
- School of Chemical Sciences , University of Illinois , Urbana , Illinois 61801 , United States
| | - Casseday P Richers
- School of Chemical Sciences , University of Illinois , Urbana , Illinois 61801 , United States
| | - Toby J Woods
- School of Chemical Sciences , University of Illinois , Urbana , Illinois 61801 , United States
| | - Thomas B Rauchfuss
- School of Chemical Sciences , University of Illinois , Urbana , Illinois 61801 , United States
| | - Federica Arrigoni
- Department of Biotechnology and Biosciences , University of Milano-Bicocca , Piazza della Scienza 2 20126 Milan , Italy
| | - Giuseppe Zampella
- Department of Biotechnology and Biosciences , University of Milano-Bicocca , Piazza della Scienza 2 20126 Milan , Italy
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Kouno M, Minami K, Kuwamura N, Konno T. A Mixed-valence Copper(I)-Copper(II) Core Supported by Rhodium(III) Octahedrons with 3-Aminopropanethiolate. CHEM LETT 2019. [DOI: 10.1246/cl.180848] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masahiro Kouno
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Katsue Minami
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Naoto Kuwamura
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Takumi Konno
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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50
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Chu X, Jin J, Ming B, Pang M, Yu X, Tung CH, Wang W. Bimetallic nickel-cobalt hydrides in H 2 activation and catalytic proton reduction. Chem Sci 2019; 10:761-767. [PMID: 30746109 PMCID: PMC6340403 DOI: 10.1039/c8sc04346a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 10/26/2018] [Indexed: 12/18/2022] Open
Abstract
The synergism of the electronic properties of nickel and cobalt enables bimetallic NiCo complexes to process H2. The nickel-cobalt hydride [(dppe)Ni(pdt)(H)CoCp*]+ ([1H]+ ) arising from protonation of the reduced state 1 was found to be an efficient electrocatalyst for H2 evolution with Cl2CHCOOH, and the oxidized [Ni(ii)Co(iii)]2+ form is capable of activating H2 to produce [1H]+ . The features of stereodynamics, acid-base properties, redox chemistry and reactivity of these bimetallic NiCo complexes in processing H2 are potentially related to the active site of [NiFe]-H2ases.
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Affiliation(s)
- Xiaoxiao Chu
- Key Lab for Colloid and Interface Chemistry of Education Ministry , School of Chemistry and Chemical Engineering , Shandong University , 250100 , China .
- School of Chemistry and Materials Science , Ludong University , Yantai , 264025 , China
| | - Jihao Jin
- Key Lab for Colloid and Interface Chemistry of Education Ministry , School of Chemistry and Chemical Engineering , Shandong University , 250100 , China .
| | - Bangrong Ming
- Key Lab for Colloid and Interface Chemistry of Education Ministry , School of Chemistry and Chemical Engineering , Shandong University , 250100 , China .
| | - Maofu Pang
- Key Lab for Colloid and Interface Chemistry of Education Ministry , School of Chemistry and Chemical Engineering , Shandong University , 250100 , China .
| | - Xin Yu
- Key Lab for Colloid and Interface Chemistry of Education Ministry , School of Chemistry and Chemical Engineering , Shandong University , 250100 , China .
| | - Chen-Ho Tung
- Key Lab for Colloid and Interface Chemistry of Education Ministry , School of Chemistry and Chemical Engineering , Shandong University , 250100 , China .
| | - Wenguang Wang
- Key Lab for Colloid and Interface Chemistry of Education Ministry , School of Chemistry and Chemical Engineering , Shandong University , 250100 , China .
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