1
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Brown J, Richeson D. Exploring ligand-centered electrocatalytic H 2O reduction: hydrogen generation with a soluble Ni(II) octabutoxyphthalocyanine complex. Dalton Trans 2024; 53:14587-14591. [PMID: 39171990 DOI: 10.1039/d4dt01419g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
A nickel(II) octabutoxyphthalocyanine complex demonstrating ligand-centered redox activity and pH dependence is reported and investigated as an electrocatalyst for hydrogen evolution from water. Spectro- and electrochemical methods were implemented to further elucidate the nature of the pH dependence and catalytic mechanism.
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Affiliation(s)
- Josh Brown
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON K1 N 6 N5, Canada.
| | - Darrin Richeson
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON K1 N 6 N5, Canada.
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2
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Keszei S, Wang Y, Zhou H, Ollár T, Kováts É, Frey K, Tapasztó L, Shen S, Pap JS. Hydrogen evolution driven by heteroatoms of bidentate N-heterocyclic ligands in iron(II) complexes. Dalton Trans 2024; 53:14817-14829. [PMID: 39171517 DOI: 10.1039/d4dt02081b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
While Pt is considered the best catalyst for the electrocatalytic hydrogen evolution reaction (HER), it is evident that non-noble metal alternatives must be explored. In this regard, it is well known that the binding sites for non-noble metals play a pivotal role in facilitating efficient catalysis. Herein, we studied Fe(II) complexes with bidentate 2-(2'-pyridyl)benzoxazole (LO), 2-(2'-pyridyl)benzthiazole (LS), 2-(2'-pyridyl)benzimidazole (LNH), and 2-2'-bipyridyl (Lpy) ligands - by adding trifluoroacetic acid (TFA) to their acetonitrile solution - in order to examine how their reactivity towards protons under reductive conditions could be impacted by the non-coordinating heteroatoms (S, O, N, or none). By applying this ligand series, we found that the reduction potentials relevant for HER correlate with ligand basicity in the presence of TFA. Moreover, DFT calculations underlined the importance of charge distribution in the ligand-based LUMO and LUMO+1 orbitals of the complexes, dependent on the heterocycle. Kinetic studies and controlled potential electrolysis - using TFA as a proton source - revealed HER activities for the complexes with LNH, LO, and LS of kobs = 0.03, 1.1, and 10.8 s-1 at overpotentials of 0.81, 0.76, and 0.79 V, respectively, and pointed towards a correlation between the kinetics of the reaction and the non-coordinating heteroatoms of the ligands. In particular, the activity was associated with the [Fe(LS/O/NH)2(S)2]2+ form (S = solvent or substrate molecule), and the rate-determining step involved the formation of [Fe(H-H)]+, during the weakening of Fe-H and CF3CO2-H bonds, according to the experimental and DFT results.
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Affiliation(s)
- Soma Keszei
- Centre for Energy Research, Institute of Technical Physics and Materials Science, H-1121, Konkoly-Thege út 29-33, Budapest, Hungary.
- Centre for Energy Research, Surface Chemistry and Catalysis Department, H-1121, Konkoly-Thege út 29-33, Budapest, Hungary
| | - Yiqing Wang
- International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Haotian Zhou
- International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Tamás Ollár
- Centre for Energy Research, Surface Chemistry and Catalysis Department, H-1121, Konkoly-Thege út 29-33, Budapest, Hungary
| | - Éva Kováts
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
| | - Krisztina Frey
- Centre for Energy Research, Surface Chemistry and Catalysis Department, H-1121, Konkoly-Thege út 29-33, Budapest, Hungary
| | - Levente Tapasztó
- Centre for Energy Research, Institute of Technical Physics and Materials Science, H-1121, Konkoly-Thege út 29-33, Budapest, Hungary.
| | - Shaohua Shen
- International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - József Sándor Pap
- Centre for Energy Research, Surface Chemistry and Catalysis Department, H-1121, Konkoly-Thege út 29-33, Budapest, Hungary
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3
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Somachandra MS, Averkiev B, Sues PE. Unsymmetric Co-Facial "Salixpyrrole" Hydrogen Evolution Catalysts: Two Metals are Better than One. Inorg Chem 2024; 63:13346-13357. [PMID: 38989677 DOI: 10.1021/acs.inorgchem.4c01101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/12/2024]
Abstract
Designing ligand architectures that can mimic enzyme active sites is a promising approach for developing efficient small molecule activation catalysts for sustainable energy applications. Some key design features include chemically distinct binding pockets for multiple metal centers and a three-dimensional structure that controls the positioning of catalytic sites. With these principles in mind, mono- and bimetallic unsymmetric cofacial palladium complexes, 2 and 3, respectively, bearing ligands with calixpyrrole and salen coordination sites, or "salixpyrrole" ligands, are reported. These species were accessed in a straightforward Schiff-base reaction with appreciable yields. In addition, both 2 and 3 were found to be active hydrogen evolution electrocatalysts using para-toluenesulfonic acid monohydrate as the proton source. The two salixpyrrole species displayed different mechanisms of action, with 2 showing a second-order dependence on acid concentration, whereas 3 exhibited a first-order dependence. Moreover, the bimetallic catalyst was significantly more efficient, with higher turnover frequencies, 4640 s-1 vs 1680 s-1 for 2, and lower overpotentials, 0.39 V vs 0.69 V for 2. The results reported herein provide proof-of-concept that bimetallic catalysts with chemically distinct binding sites demonstrate enhanced catalytic properties in comparison to monometallic or symmetric analogues.
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Affiliation(s)
| | - Boris Averkiev
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66503, United States
| | - Peter E Sues
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66503, United States
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4
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Wang B, Huang X, Bi H, Liu J. Electroreductive alkylations of (hetero)arenes with carboxylic acids. Nat Commun 2024; 15:4970. [PMID: 38862567 PMCID: PMC11166922 DOI: 10.1038/s41467-024-49355-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Accepted: 06/03/2024] [Indexed: 06/13/2024] Open
Abstract
Carboxylic acids are widely available and generally inexpensive from abundant biomass feedstocks, and they are suitable and generic coupling partners in synthetic chemistry. Reported herein is an electroreductive coupling of stable and versatile carboxylic acids with (hetero)arenes using protons as the hydrogen source. The application of an earth-abundant titanium catalyst has significantly improved the deoxygenative reduction process. Preliminary mechanistic studies provide insights into the deoxygenative reduction of in-situ generated ketone pathway, and the intermediacy generation of ketyl radical and alkylidene titanocene. Without the necessity of pressurized hydrogen or stoichiometric hydride as reductants, this protocol enables highly selective and straightforward synthesis of various functionalized and structurally diverse alkylbenzenes under mild conditions. The utility of this reaction is further demonstrated through practical and valuable isotope incorporation from readily available deuterium source.
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Affiliation(s)
- Bing Wang
- College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, 410082, Changsha, China
| | - Xianshuai Huang
- College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, 410082, Changsha, China
| | - Huihua Bi
- College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, 410082, Changsha, China
| | - Jie Liu
- College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, 410082, Changsha, China.
- Greater Bay Area Institute for Innovation, Hunan University, 511300, Guangzhou, China.
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5
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Wang T, He F, Jiang W, Liu J. Electrohydrogenation of Nitriles with Amines by Cobalt Catalysis. Angew Chem Int Ed Engl 2024; 63:e202316140. [PMID: 38124405 DOI: 10.1002/anie.202316140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 12/19/2023] [Accepted: 12/20/2023] [Indexed: 12/23/2023]
Abstract
Catalytic hydrogenation of nitriles represents an efficient and sustainable one-step synthesis of valuable bulk and fine chemicals. We report herein a molecular cobalt electrocatalyst for selective hydrogenative coupling of nitriles with amines using protons as the hydrogen source. The key to success for this reductive reaction is the use of an electrocatalytic approach for efficient cobalt-hydride generation through a sequence of cathodic reduction and protonation. As only electrons (e- ) and protons (H+ ) as the redox equivalent and hydrogen source, this general electrohydrogenation protocol is showcased by highly selective and straightforward synthesis of various functionalized and structurally diverse amines, as well as deuterium isotope labeling applications. Mechanistic studies reveal that the electrogenerated cobalt-hydride transfer to nitrile process is the rate-determining step.
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Affiliation(s)
- Tiantian Wang
- College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, 410082, Changsha, China
| | - Fangfang He
- College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, 410082, Changsha, China
| | - Wei Jiang
- College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, 410082, Changsha, China
| | - Jie Liu
- College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, 410082, Changsha, China
- Greater Bay Area Institute for Innovation, Hunan University, 511300, Guangzhou, Guangdong Province, China
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6
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Ocampo MVL, Murray LJ. Metal-Tuned Ligand Reactivity Enables CX 2 (X = O, S) Homocoupling with Spectator Cu Centers. J Am Chem Soc 2024; 146:1019-1025. [PMID: 38165085 DOI: 10.1021/jacs.3c11928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Ligand non-innocence is ubiquitous in catalysis with ligands in synthetic complexes contributing as electron reservoirs or co-sites for substrate activation. The latter chemical non-innocence is manifested in H+ storage or relay at sites beyond the metal primary coordination sphere. Reaction of a competent CO2-to-oxalate reduction catalyst, namely, [K(THF)3](Cu3SL), where L3- is a tris(β-diketiminate) cyclophane, with CS2 affords tetrathiooxalate at long reaction times or at high CS2 concentrations, where otherwise an equilibrium is established between the starting species and a complex-CS2 adduct in which the CS2 is bound to the C atom on the ligand backbone. X-ray diffraction analysis of this adduct reveals no apparent metal participation, suggesting an entirely ligand-based reaction controlled by the charge state of the cluster. Thermodynamic parameters for the formation of the aforementioned Cligand-CS2 bond were experimentally determined, and trends with cation Lewis acidity were studied, where more acidic cations shift the equilibrium toward the adduct. Relevance of such an adduct in the reduction of CO2 to oxalate by this complex is supported by DFT studies, similar effects of countercation Lewis acidity on product formation, and the homocoupled heterocumulene product speciation as determined by isotopic labeling studies. Taken together, this system extends chemical non-innocence beyond H+ to effect catalytic transformations involving C-C bond formation and represents the rarest example of metal-ligand cooperativity, that is, spectator metal ion(s) and the ligand as the reaction center.
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Affiliation(s)
- M Victoria Lorenzo Ocampo
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Leslie J Murray
- Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
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7
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Fortunato MT, Moore CE, Turro C. Ligand-Centered Photocatalytic Hydrogen Production in an Axially Capped Rh 2(II,II) Paddlewheel Complex with Red Light. J Am Chem Soc 2023; 145:27348-27357. [PMID: 38055041 DOI: 10.1021/jacs.3c07532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
A new series of Rh2(II,II) complexes with the formula cis-[Rh2(DTolF)2(bpnp)(L)]2+, where bpnp = 2,7-bis(2-pyridyl)-1,8-naphthyridine, DTolF = N,N'-di(p-tolyl) formamidinate, and L = pdz (pyridazine; 2), cinn (cinnoline; 3), and bncn (benzo[c]cinnoline; 4), were synthesized from the precursor cis-[Rh2(DTolF)2(bpnp)(CH3CN)2]2+ (1). The first reduction couple in 2-4 is localized on the bpnp ligand at approximately -0.52 V vs Ag/AgCl in CH3CN (0.1 M TBAPF6), followed by reduction of the corresponding diazine ligand. Complex 1 exhibits a Rh2(δ*)/DTolF → bpnp(π*) metal/ligand-to-ligand charge-transfer (1ML-LCT) absorption with a maximum at 767 nm (ε = 1800 M-1 cm-1). This transition is also present in the spectra of 2-4, overlaid with the Rh2(δ*)/DTolF → L(π*) 1ML-LCT bands at 516 nm in 2 (L = pdz), 640 nm in 3 (L = cinn), and 721 nm in 4 (L = bncn). Complexes 2 and 3 exhibit Rh2(δ*)/DTolF → bpnp 3ML-LCT excited states with lifetimes, τ, of 3 and 5 ns, respectively, in CH3CN, whereas the lowest energy 3ML-LCT state in 4 is Rh2(δ*)/DTolF → bncn in nature with τ = 1 ns. Irradiation of 4 with 670 nm light in DMF in the presence of 0.1 M TsOH (p-toluene sulfonic acid) and 30 mM BNAH (1-benzyl-1,4-dihydronicotinamide) results in the production of H2 with a turnover number (TON) of 16 over 24 h. The axial capping of the Rh2(II,II) bimetallic core with the bpnp ligand prevents the formation of an Rh-H hydride intermediate. These results show that the observed photocatalytic reactivity is localized on the bncn ligand, representing the first example of ligand-centered H2 production.
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Affiliation(s)
- Matthew T Fortunato
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43214, United States
| | - Curtis E Moore
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43214, United States
| | - Claudia Turro
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43214, United States
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8
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Kumar P, Tyagi VP, Ghosh M. Exploring the Multifarious Role of the Ligand in Electrocatalytic Hydrogen Evolution Reaction Pathways. Chemistry 2023; 29:e202302195. [PMID: 37728113 DOI: 10.1002/chem.202302195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/18/2023] [Accepted: 09/18/2023] [Indexed: 09/21/2023]
Abstract
In recent years, researchers have shifted their focus towards investigating the redox properties of ancillary ligand backbones for small-molecule activation. Several metal complexes have been reported for the electrocatalytic H2 evolution reaction (HER), providing valuable mechanistic insights. This process involves efficient coupling of electrons and protons. Redox-active ligands stipulate internal electron transfer and promote effective orbital overlap between metal and ligand, thereby, enabling efficient proton-coupled electron transfer reactions. Understanding such catalytic mechanisms requires thorough spectroscopic and computational analyses. Herein, we summarize recent examples of molecular electrocatalysts based on 3d transition metals that have significantly influenced mechanistic pathways, thus, emphasizing the multifaceted role of metal-ligand cooperativity.
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Affiliation(s)
- Pankaj Kumar
- Department of Chemistry, Ashoka University, Plot #2, Rajiv Gandhi Education City, National Capital Region, 131029, Sonipat, Haryana, India
| | - Vyom Prakash Tyagi
- Department of Chemistry, Ashoka University, Plot #2, Rajiv Gandhi Education City, National Capital Region, 131029, Sonipat, Haryana, India
| | - Munmun Ghosh
- Department of Chemistry, Ashoka University, Plot #2, Rajiv Gandhi Education City, National Capital Region, 131029, Sonipat, Haryana, India
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9
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McCarver GA, Yildirim T, Zhou W. Catalyst Engineering for the Selective Reduction of CO 2 to CH 4 : A First-Principles Study on X-MOF-74 (X=Mg, Mn, Fe, Co, Ni, Cu, Zn). Chemphyschem 2023:e202300645. [PMID: 37801605 DOI: 10.1002/cphc.202300645] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 09/29/2023] [Accepted: 10/06/2023] [Indexed: 10/08/2023]
Abstract
The conversion of carbon dioxide (CO2 ) into more valuable chemical compounds represents a critical objective for addressing environmental challenges and advancing sustainable energy sources. The CO2 reduction reaction (CO2 RR) holds promise for transforming CO2 into versatile feedstock materials and fuels. Leveraging first-principles methodologies provides a robust approach to evaluate catalysts and steer experimental efforts. In this study, we examine the CO2 RR process using a diverse array of representative cluster models derived from X-MOF-74 (where X encompasses Mg, Mn, Fe, Co, Ni, Cu, or Zn) through first-principles methods. Notably, our investigation highlights the Fe-MOF-74 cluster's unique attributes, including favorable CO2 binding and the lowest limiting potential of the studied clusters for converting CO2 to methane (CH4 ) at 0.32 eV. Our analysis identified critical factors driving the selective CO2 RR pathway, enabling the formation CH4 on the Fe-MOF-74 cluster. These factors involve less favorable reduction of hydrogen to H2 and strong binding affinities between the Fe open-metal site and reduction intermediates, effectively curtailing desorption processes of closed-shell intermediates such as formic acid (HCOOH), formaldehyde (CH2 O), and methanol (CH3 OH), to lead to selective CH4 formation.
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Affiliation(s)
- Gavin A McCarver
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Taner Yildirim
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Wei Zhou
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
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10
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Neugebauer H, Vuong HT, Weber JL, Friesner RA, Shee J, Hansen A. Toward Benchmark-Quality Ab Initio Predictions for 3d Transition Metal Electrocatalysts: A Comparison of CCSD(T) and ph-AFQMC. J Chem Theory Comput 2023; 19:6208-6225. [PMID: 37655473 DOI: 10.1021/acs.jctc.3c00617] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Generating accurate ab initio ionization energies for transition metal complexes is an important step toward the accurate computational description of their electrocatalytic reactions. Benchmark-quality data is required for testing existing theoretical methods and developing new ones but is complicated to obtain for many transition metal compounds due to the potential presence of both strong dynamical and static electron correlation. In this regime, it is questionable whether the so-called gold standard, coupled cluster with singles, doubles, and perturbative triples (CCSD(T)), provides the desired level of accuracy─roughly 1-3 kcal/mol. In this work, we compiled a test set of 28 3d metal-containing molecules relevant to homogeneous electrocatalysis (termed 3dTMV) and computed their vertical ionization energies (ionization potentials) with CCSD(T) and phaseless auxiliary-field quantum Monte Carlo (ph-AFQMC) in the def2-SVP basis set. A substantial effort has been made to converge away the phaseless bias in the ph-AFQMC reference values. We assess a wide variety of multireference diagnostics and find that spin-symmetry breaking of the CCSD wave function and the PBE0 density functional correlate well with our analysis of multiconfigurational wave functions. We propose quantitative criteria based on symmetry breaking to delineate correlation regimes inside of which appropriately performed CCSD(T) can produce mean absolute deviations from the ph-AFQMC reference values of roughly 2 kcal/mol or less and outside of which CCSD(T) is expected to fail. We also present a preliminary assessment of density functional theory (DFT) functionals on the 3dTMV set.
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Affiliation(s)
- Hagen Neugebauer
- Mulliken Center for Theoretical Chemistry, Clausius Institute for Physical and Theoretical Chemistry, University of Bonn, Beringstr. 4, D-53115 Bonn, Germany
| | - Hung T Vuong
- Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, United States
| | - John L Weber
- Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, United States
| | - Richard A Friesner
- Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, United States
| | - James Shee
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Andreas Hansen
- Mulliken Center for Theoretical Chemistry, Clausius Institute for Physical and Theoretical Chemistry, University of Bonn, Beringstr. 4, D-53115 Bonn, Germany
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11
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Zheng Y, Wang L, Pang J, Sun K, Hou J, Wang G, Guo W, Chen L. Ni 3S 2/Co 9S 8 embedded poor crystallinity NiCo layered double hydroxides hierarchical nanostructures for efficient overall water splitting. J Colloid Interface Sci 2023; 637:85-93. [PMID: 36689800 DOI: 10.1016/j.jcis.2023.01.074] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 01/12/2023] [Accepted: 01/14/2023] [Indexed: 01/19/2023]
Abstract
Nickel-cobalt bimetallic layered double hydroxides (NiCo LDHs) are potential electrocatalysts with high performance and stability for overall water-splitting. However, its weak conductivity limits its practical applications. Herein, a simple hydrothermal in-situ conversion strategy is employed for constructing the novel heterogeneous electrocatalyst of Ni3S2/Co9S8 embedded poor crystallinity (Pc) NiCo LDH nanosheet arrays grown on the Ni foam (Pc-NiCo LDH/ Ni3S2/Co9S8), which can improve the conductivity via regulating the crystallinity. The crystallinity of NiCo LDH is well regulated by adjusting the amount of sulfur source, and the construction of Ni3S2/Co9S8 heterostructure exposes more active sites, improves the electrical conductivity, enhances the electronic interaction between NiCo LDH and Ni3S2/Co9S8, and significantly promotes the kinetics of water splitting. The optimized Pc-NiCo LDH/Ni3S2/Co9S8 hierarchical structure as both the anode and cathode exhibit the overall water splitting performance with the cell voltage of only 1.744 V to achieve the current density of 50 mA cm-2 in the alkaline media and shows the competitive H2 and O2 production rate of 6.4 and 3.1 μL s-1, respectively, suggesting its potential practical applications. This work provides a novel idea for the design of multiphase composite electrocatalysts applied in water splitting.
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Affiliation(s)
- Yang Zheng
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China.
| | - Liping Wang
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China.
| | - Jianxiang Pang
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China
| | - Kaisheng Sun
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China
| | - Juan Hou
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China
| | - Gang Wang
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China
| | - Wen Guo
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China
| | - Long Chen
- School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China.
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12
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Barma A, Chakraborty M, Kumar Bhattacharya S, Roy P. Mononuclear nickel and copper complexes as electrocatalyst for generation of hydrogen from acetic acid. INORG CHEM COMMUN 2023. [DOI: 10.1016/j.inoche.2023.110521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
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13
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Redox-active ligands for chemical, electrochemical, and photochemical molecular conversions. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Bruch QJ, Tanushi A, Müller P, Radosevich AT. Metal-Ligand Role Reversal: Hydride-Transfer Catalysis by a Functional Phosphorus Ligand with a Spectator Metal. J Am Chem Soc 2022; 144:21443-21447. [PMID: 36378626 PMCID: PMC9712262 DOI: 10.1021/jacs.2c10200] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Hydride transfer catalysis is shown to be enabled by the nonspectator reactivity of a transition metal-bound low-symmetry tricoordinate phosphorus ligand. Complex 1·[Ru]+, comprising a nontrigonal phosphorus chelate (1, P(N(o-N(2-pyridyl)C6H4)2) and an inert metal fragment ([Ru] = (Me5C5)Ru), reacts with NaBH4 to give a metallohydridophosphorane (1H·[Ru]) by P-H bond formation. Complex 1H·[Ru] is revealed to be a potent hydride donor (ΔG°H-,exp < 41 kcal/mol, ΔG°H-,calc = 38 ± 2 kcal/mol in MeCN). Taken together, the reactivity of the 1·[Ru]+/1H·[Ru] pair comprises a catalytic couple, enabling catalytic hydrodechlorination in which phosphorus is the sole reactive site of hydride transfer.
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Affiliation(s)
- Quinton J. Bruch
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Akira Tanushi
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Peter Müller
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Alexander T. Radosevich
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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15
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Yang G, Cen JH, Lan J, Li MY, Zhan X, Yuan GQ, Liu HY. Non-Metallic Phosphorus Corrole as Efficient Electrocatalyst in Hydrogen Evolution Reaction. CHEMSUSCHEM 2022; 15:e202201553. [PMID: 36121337 DOI: 10.1002/cssc.202201553] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 09/13/2022] [Indexed: 06/15/2023]
Abstract
The economical consideration of using an electrocatalyst in energy-related field, composed of non-precious/sustainable elements is quite noteworthy. In this work, the phosphorus(V) complex of tris-(pentafluorophenyl)corrole [(TPFC)PV (OH)2 ] was reported as electrocatalyst for the hydrogen evolution reaction (HER). The electrochemical studies revealed that the HER experienced a ECEC pathway (E: electron transfer step, C: chemical step), and the possible intermediate [PV ]-H species was suggested. (TPFC)PV (OH)2 displayed excellent HER activity in dimethylformamide (DMF) with trifluoroacetic acid (TFA) as the proton source, and the turnover frequency (TOF) reached 31.75 s-1 at an overpotential of 900 mV. Interestingly, the HER electrocatalytic performance remained extraordinary even applying water as a proton source in acetonitrile/water (v/v=2 : 3), with a TOF of 18.40 mol H 2 ${{_{{\rm H}{_{2}}}}}$ molcat -1 h-1 at an overpotential of 900 mV.
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Affiliation(s)
- Gang Yang
- Department of Chemistry, Guangdong Provincial Key Laboratory of Fuel Cell Technology & School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, P. R. China
| | - Jing-He Cen
- Department of Chemistry, Guangdong Provincial Key Laboratory of Fuel Cell Technology & School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, P. R. China
| | - Jian Lan
- Department of Chemistry, Guangdong Provincial Key Laboratory of Fuel Cell Technology & School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, P. R. China
| | - Meng-Yuan Li
- Department of Chemistry, Guangdong Provincial Key Laboratory of Fuel Cell Technology & School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, P. R. China
| | - Xuan Zhan
- School of Life and Health Sciences, The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen), 518172, Shenzhen, P. R. China
| | - Gao-Qing Yuan
- Department of Chemistry, Guangdong Provincial Key Laboratory of Fuel Cell Technology & School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, P. R. China
| | - Hai-Yang Liu
- Department of Chemistry, Guangdong Provincial Key Laboratory of Fuel Cell Technology & School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, P. R. China
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16
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Skaria M, Culpepper JD, Daly SR. Leveraging Metal and Ligand Reactive Sites for One Pot Reactions: Ligand-Centered Borenium Ions for Tandem Catalysis with Palladium. Chemistry 2022; 28:e202201791. [PMID: 35997655 PMCID: PMC9828003 DOI: 10.1002/chem.202201791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Indexed: 01/12/2023]
Abstract
Tandem catalysts that perform two different organic transformations in a single pot are highly desirable because they enable rapid and efficient assembly of simple organic building blocks into more complex molecules. Many examples of tandem catalysis rely on metal-catalyzed reactions involving one or more metal complexes. Remarkably, despite surging interest in the development of chemically reactive (i. e., non-innocent) ligands, there are few examples of metal complexes that leverage ligand-centered reactivity to perform catalytic reactions in tandem with separate catalytic reactions at the metal. Here we report how multifunctional Pd complexes with triaminoborane-derived diphosphorus ligands, called TBDPhos, appear to facilitate borenium-catalyzed cycloaddition reactions at the ligand, and Pd-catalyzed Stille and Suzuki cross-coupling reactions at the metal. Both transformations can be accessed in one pot to afford rare examples of tandem catalysis using separate metal and ligand catalysis sites in a single complex.
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Affiliation(s)
- Manisha Skaria
- Department of ChemistryThe University of IowaIowa CityIowa52242USA
| | | | - Scott R. Daly
- Department of ChemistryThe University of IowaIowa CityIowa52242USA
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17
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Lin S, Banerjee S, Fortunato MT, Xue C, Huang J, Sokolov AY, Turro C. Electrochemical Strategy for Proton Relay Installation Enhances the Activity of a Hydrogen Evolution Electrocatalyst. J Am Chem Soc 2022; 144:20267-20277. [DOI: 10.1021/jacs.2c06011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shaoyang Lin
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio43214, United States
| | - Samragni Banerjee
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio43214, United States
| | - Matthew T. Fortunato
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio43214, United States
| | - Congcong Xue
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio43214, United States
| | - Jie Huang
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio43214, United States
| | - Alexander Yu. Sokolov
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio43214, United States
| | - Claudia Turro
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio43214, United States
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18
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Williams CK, McCarver GA, Chaturvedi A, Sinha S, Ang M, Vogiatzis KD, Jiang J“J. Electrocatalytic Hydrogen Evolution Using A Molecular Antimony Complex under Aqueous Conditions: An Experimental and Computational Study on Main‐Group Element Catalysis. Chemistry 2022; 28:e202201323. [DOI: 10.1002/chem.202201323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Caroline K. Williams
- Department of Chemistry University of Cincinnati P.O. Box 210172 Cincinnati Ohio 45221 USA
| | - Gavin A. McCarver
- Department of Chemistry University of Tennessee Knoxville Tennessee 37996-1600 USA
| | - Ashwin Chaturvedi
- Department of Chemistry University of Cincinnati P.O. Box 210172 Cincinnati Ohio 45221 USA
| | - Soumalya Sinha
- Department of Chemistry University of Cincinnati P.O. Box 210172 Cincinnati Ohio 45221 USA
| | - Marcus Ang
- Department of Chemistry University of Cincinnati P.O. Box 210172 Cincinnati Ohio 45221 USA
| | | | - Jianbing “Jimmy” Jiang
- Department of Chemistry University of Cincinnati P.O. Box 210172 Cincinnati Ohio 45221 USA
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19
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To TH, Tran DB, Thi Thu Ha V, Tran PD. Electrocatalytic H 2 evolution using binuclear cobalt complexes as catalysts. RSC Adv 2022; 12:26428-26434. [PMID: 36275106 PMCID: PMC9479770 DOI: 10.1039/d2ra05109e] [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: 08/15/2022] [Accepted: 09/08/2022] [Indexed: 11/21/2022] Open
Abstract
We report herein on the use of two binuclear cobalt complexes with the N,N'-bis(salicylidene)-phenylmethanediamine ligand as catalysts for the H2 evolution in DMF solution with acetic acid as proton source. Both experimental analyses (electrochemical analysis, spectroscopy analysis) and theoretical analysis (foot-of-the wave analysis) were employed. These catalysts required an overpotential of ca. 470 mV to catalyze the H2 evolution and generated H2 gas with a faradaic efficiency of 85-95% as calculated on the basis of after 5 hour bulk electrolysis. The kinetic investigation showed the maximal TOF value of 50 s-1 on the basis of an ECEC mechanism. Two cobalt centers, standing at a long distance of 4.175 Å, operated independently during catalysis without a synergetic effect or cooperation capability.
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Affiliation(s)
- Tung H To
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Vietnam
- University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Vietnam
| | - Dang B Tran
- University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Vietnam
- Ho Chi Minh City University of Education 280 An Duong Vuong Ho Chi Minh City Vietnam
| | - Vu Thi Thu Ha
- Institute of Chemistry, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Vietnam
| | - Phong D Tran
- University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Vietnam
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20
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Chaturvedi A, McCarver GA, Sinha S, Hix EG, Vogiatzis KD, Jiang J. A PEGylated Tin Porphyrin Complex for Electrocatalytic Proton Reduction: Mechanistic Insights into Main‐Group‐Element Catalysis. Angew Chem Int Ed Engl 2022; 61:e202206325. [DOI: 10.1002/anie.202206325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Ashwin Chaturvedi
- Department of Chemistry University of Cincinnati Cincinnati OH 45221 USA
| | - Gavin A. McCarver
- Department of Chemistry University of Tennessee Knoxville TN 37996-1600 USA
| | - Soumalya Sinha
- Department of Chemistry University of Cincinnati Cincinnati OH 45221 USA
| | - Elijah G. Hix
- Department of Chemistry University of Tennessee Knoxville TN 37996-1600 USA
| | | | - Jianbing Jiang
- Department of Chemistry University of Cincinnati Cincinnati OH 45221 USA
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21
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Chaturvedi A, McCarver GA, Sinha S, Hix EG, Vogiatzis KD, Jiang JJ. A PEGylated Tin‐Porphyrin Complex for Electrocatalytic Proton Reduction: Mechanistic Insights into Main‐Group Element Catalysis. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202206325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ashwin Chaturvedi
- University of Cincinnati Chemistry 312 College Dr. 45221 Cincinnati UNITED STATES
| | - Gavin A McCarver
- UT Knoxville: The University of Tennessee Knoxville Chemistry UNITED STATES
| | | | - Elijah G Hix
- UT Knoxville: The University of Tennessee Knoxville Chemistry UNITED STATES
| | - Konstantinos D Vogiatzis
- UT Knoxville: The University of Tennessee Knoxville Chemistry Buehler Hall1420 Circle Dr. 37996 Knoxville UNITED STATES
| | - Jianbing Jimmy Jiang
- University of Cincinnati Chemistry 312 College Dr. 45221 Cincinnati UNITED STATES
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22
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Gnaim S, Bauer A, Zhang HJ, Chen L, Gannett C, Malapit CA, Hill DE, Vogt D, Tang T, Daley RA, Hao W, Zeng R, Quertenmont M, Beck WD, Kandahari E, Vantourout JC, Echeverria PG, Abruna HD, Blackmond DG, Minteer SD, Reisman SE, Sigman MS, Baran PS. Cobalt-electrocatalytic HAT for functionalization of unsaturated C-C bonds. Nature 2022; 605:687-695. [PMID: 35614246 PMCID: PMC9206406 DOI: 10.1038/s41586-022-04595-3] [Citation(s) in RCA: 55] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 03/01/2022] [Indexed: 12/23/2022]
Abstract
The study and application of transition metal hydrides (TMHs) has been an active area of chemical research since the early 1960s1, for energy storage, through the reduction of protons to generate hydrogen2,3, and for organic synthesis, for the functionalization of unsaturated C-C, C-O and C-N bonds4,5. In the former instance, electrochemical means for driving such reactivity has been common place since the 1950s6 but the use of stoichiometric exogenous organic- and metal-based reductants to harness the power of TMHs in synthetic chemistry remains the norm. In particular, cobalt-based TMHs have found widespread use for the derivatization of olefins and alkynes in complex molecule construction, often by a net hydrogen atom transfer (HAT)7. Here we show how an electrocatalytic approach inspired by decades of energy storage research can be made use of in the context of modern organic synthesis. This strategy not only offers benefits in terms of sustainability and efficiency but also enables enhanced chemoselectivity and distinct, tunable reactivity. Ten different reaction manifolds across dozens of substrates are exemplified, along with detailed mechanistic insights into this scalable electrochemical entry into Co-H generation that takes place through a low-valent intermediate.
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Affiliation(s)
- Samer Gnaim
- Department of Chemistry, The Scripps Research Institute (TSRI), La Jolla, CA, USA
| | - Adriano Bauer
- Department of Chemistry, The Scripps Research Institute (TSRI), La Jolla, CA, USA
| | - Hai-Jun Zhang
- Department of Chemistry, The Scripps Research Institute (TSRI), La Jolla, CA, USA
| | - Longrui Chen
- Department of Chemistry, The Scripps Research Institute (TSRI), La Jolla, CA, USA
| | - Cara Gannett
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA
| | | | - David E Hill
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - David Vogt
- Department of Chemistry, University of Utah, Salt Lake City, UT, USA
| | - Tianhua Tang
- Department of Chemistry, University of Utah, Salt Lake City, UT, USA
| | - Ryan A Daley
- Department of Chemistry, The Scripps Research Institute (TSRI), La Jolla, CA, USA
| | - Wei Hao
- Department of Chemistry, The Scripps Research Institute (TSRI), La Jolla, CA, USA
| | - Rui Zeng
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA
| | | | - Wesley D Beck
- Department of Chemistry, University of Utah, Salt Lake City, UT, USA
| | - Elya Kandahari
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Julien C Vantourout
- Department of Chemistry, The Scripps Research Institute (TSRI), La Jolla, CA, USA
| | | | - Hector D Abruna
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA.
| | - Donna G Blackmond
- Department of Chemistry, The Scripps Research Institute (TSRI), La Jolla, CA, USA.
| | - Shelley D Minteer
- Department of Chemistry, University of Utah, Salt Lake City, UT, USA.
| | - Sarah E Reisman
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA.
| | - Matthew S Sigman
- Department of Chemistry, University of Utah, Salt Lake City, UT, USA.
| | - Phil S Baran
- Department of Chemistry, The Scripps Research Institute (TSRI), La Jolla, CA, USA.
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23
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Tran DB, To TH, Tran PD. Mo- and W-molecular catalysts for the H2 evolution, CO2 reduction and N2 fixation. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214400] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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24
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Gorantla KR, Mallik BS. Catalytic Mechanism of Competing Proton Transfer Events from Water and Acetic Acid by [Co II(bpbH 2)Cl 2] for Water Splitting Processes. J Phys Chem A 2022; 126:1321-1328. [PMID: 35172100 DOI: 10.1021/acs.jpca.1c07353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We performed first principles simulations to explore the water reduction process of the cobalt complex [CoII(bpbH2)Cl2], where bpbH2 = N,N'-bis(2'-pyridine carboxamide)-1,2-benzene. We considered the sequence steps of electron reduction followed by the proton addition process to observe the hydrogen evolution process. An experimental study of the catalyst showed that the increase in the acetic acid concentration triggers catalytic current and reduction of Co(II) to Co(I), and protonation occurred, yielding a Co(III)-H intermediate. Therefore, we used water and acetic acid as the proton sources. We compare the proton transfer kinetics from both the water and acetic acid. The reduction potentials and proton transfer kinetics from water or acetic acid to the reaction center were studied in a DMF solvent through the implicit solvent model. The first proton transfer from the acetic acid is more favorable, forming a CoIII-H complex and further reducing to CoII-H. The second proton transfer from water to the CoII-H moiety requires less free energy than acetic acid and is the rate-limiting step. The nature of the reduction process is also examined through the charge analysis, which reveals that the ligand becomes softer due to the C═O groups.
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Affiliation(s)
- Koteswara Rao Gorantla
- Department of Chemistry, Indian Institute of Technology Hyderabad, Sangareddy 502285, Telangana, India
| | - Bhabani S Mallik
- Department of Chemistry, Indian Institute of Technology Hyderabad, Sangareddy 502285, Telangana, India
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25
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Barrozo A, Orio M. From Ligand- to Metal-centered Reactivity: Metal Substitution Effect in Thiosemicarbazone-based Complexes for H2 Production. Chemphyschem 2022; 23:e202200056. [PMID: 35213068 DOI: 10.1002/cphc.202200056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 02/23/2022] [Indexed: 11/10/2022]
Abstract
The quest to develop and optimize catalysts for H 2 production requires a thorough understanding in the possible catalytic mechanisms involved. Transition metals are very often the centers of reactivity in the catalysis, although this can change in the presence of a redox-active ligand. Investigating the differences in catalysis when considering ligand- and metal-centered reactivity is important to find the most optimal mechanisms for hydrogen evolution reaction. Here, we investigated this change of reactivity in two versions of a thiosemicarbazone-based complex, using Co and Ni metal centers. While the Ni version has a ligand-centered reactivity, Co switches it toward a metal-centered one. Comparison between the mechanisms show differences in rate-limiting steps, and shows the importance of identifying those steps in order to optimize the system for hydrogen production.
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Affiliation(s)
- Alexandre Barrozo
- University of Southern California, Department of Chemistry, SSC 404, University of Southern California, 90089-0482, Los Angeles, UNITED STATES
| | - Maylis Orio
- iSm2: Institut des Sciences Moleculaires de Marseille, Biosciences, 52 Avenue Escadrille Normandie Niemen, 13013, Marseille, FRANCE
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26
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Sun L, Adam SM, Mokdad W, David R, Milet A, Artero V, Duboc C. A bio-inspired heterodinuclear hydrogenase CoFe complex. Faraday Discuss 2022; 234:34-41. [PMID: 35188161 DOI: 10.1039/d1fd00085c] [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
Herein, a new heterobimetallic CoFe complex is reported with the aim of comparing its performance in terms of H2 production within a series of related MFe complexes (M = Ni, Fe). The fully oxidized [(LN2S2)CoII(CO)FeIICp]+ complex (CoIIFeII, LN2S2 2- = 2,2'-(2,2'-bipyridine-6,6'-diyl)bis(1,1'-diphenylethanethiolate), Cp- = cyclopentadienyl anion) can be (electro)chemically reduced to its CoIFeII form, and both complexes have been isolated and fully characterized by means of classic spectroscopic techniques and theoretical calculations. The redox properties of CoIIFeII have been investigated in DMF, revealing that this complex is the easiest to reduce by one-electron among the analogous MFe complexes (M = Ni, Fe, Co). Nevertheless, it displays no electrocatalytic activity for H2 production, contrary to the FeFe and NiFe analogs, which have proven remarkable performance.
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Affiliation(s)
- Lili Sun
- Univ. Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France.
| | - Suzanne M Adam
- Univ. Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France. .,Univ. Grenoble Alpes, CNRS, CEA, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
| | - Walaa Mokdad
- Univ. Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France.
| | - Rolf David
- Univ. Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France.
| | - Anne Milet
- Univ. Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France.
| | - Vincent Artero
- Univ. Grenoble Alpes, CNRS, CEA, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
| | - Carole Duboc
- Univ. Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France.
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27
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Upadhyay A, Saurav KV, Varghese EL, Hodage AS, Paul A, Awasthi MK, Singh SK, Kumar S. Proton reduction by a bimetallic zinc selenolate electrocatalyst. RSC Adv 2022; 12:3801-3808. [PMID: 35425408 PMCID: PMC8981091 DOI: 10.1039/d1ra08614f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 01/18/2022] [Indexed: 11/21/2022] Open
Abstract
The development of alternative energy sources is the utmost priority of developing society. Unlike many prior homogeneous electrocatalysts that rely on a change in the oxidation state of the metal center and/or electrochemically active ligand, here we report the synthesis and structural characterization of a bimetallic zinc selenolate complex consisting of a redox silent zinc metal ion and a tridentate ligand that catalyzes the reduction of protons into hydrogen gas electrochemically and displays one of the highest reported TOF for a homogeneous TM-metal free ligand centered HER catalyst, 509 s-1. The current-voltage analysis confirms the onset overpotential of 0.86 V vs. Ag/AgCl for the HER process. Constant potential electrolysis (CPE) has been carried out to study the bulk electrolysis of our developed protocol, which reveals that the bimetallic zinc selenolate catalyst is stable under cathodic as well as anodic potentials and generates hydrogen gas with a faradaic efficiency of 75%. Preliminary studies on the heterogeneous catalyst were conducted by depositing the bimetallic zinc selenolate catalyst on the electrode surface.
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Affiliation(s)
- Aditya Upadhyay
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal By-Pass Road, Bhauri Bhopal 462 066 Madhya Pradesh India
| | - K V Saurav
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal By-Pass Road, Bhauri Bhopal 462 066 Madhya Pradesh India
| | - Evelin Lilly Varghese
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal By-Pass Road, Bhauri Bhopal 462 066 Madhya Pradesh India
| | - Ananda S Hodage
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal By-Pass Road, Bhauri Bhopal 462 066 Madhya Pradesh India
| | - Amit Paul
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal By-Pass Road, Bhauri Bhopal 462 066 Madhya Pradesh India
| | - Mahendra Kumar Awasthi
- Department of Chemistry, Indian Institute of Technology Indore Khandwa Road, Simrol Indore 453552 Madhya Pradesh India
| | - Sanjay Kumar Singh
- Department of Chemistry, Indian Institute of Technology Indore Khandwa Road, Simrol Indore 453552 Madhya Pradesh India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal By-Pass Road, Bhauri Bhopal 462 066 Madhya Pradesh India
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28
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Raj M, Padhi SK. Electrocatalytic proton reduction by dinuclear cobalt complexes in a nonaqueous electrolyte. NEW J CHEM 2022. [DOI: 10.1039/d1nj06003a] [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
Two dinuclear CoII complexes 1 and 2 have been synthesized and characterized using various spectroscopic methods. Both the complexes were employed for H+ reduction in organic media. Faradaic efficiency of 82–90% was obtained for the H2 evolution.
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Affiliation(s)
- Manaswini Raj
- Artificial Photosynthesis Laboratory, Department of Chemistry and Chemical Biology, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, India
| | - Sumanta Kumar Padhi
- Artificial Photosynthesis Laboratory, Department of Chemistry and Chemical Biology, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, India
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29
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Role of a Redox-Active Ligand Close to a Dinuclear Activating Framework. TOP ORGANOMETAL CHEM 2022. [DOI: 10.1007/3418_2022_77] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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30
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Norouziyanlakvan S, Rao GK, Ovens J, Gabidullin B, Richeson D. Electrocatalytic H 2 Generation from Water Relying on Cooperative Ligand Electron Transfer in "PN 3 P" Pincer-Supported Ni II Complexes. Chemistry 2021; 27:13518-13522. [PMID: 34415632 DOI: 10.1002/chem.202102031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Indexed: 11/07/2022]
Abstract
Water is the most sustainable source for H2 production, and the efficient electrocatalytic production of H2 from mixed water/acetonitrile solutions by using two new air-stable nickel(II) pincer complexes, [Ni(κ3 -2,6-{Ph2 PNR}2 (NC5 H3 )Br2 ] (R=H I, Me II) is reported. Hydrogen generation from H2 O/CH3 CN solutions is initiated at -2 V against Fc+/0 , and bulk electrocatalysis studies showed that the catalyst functions with an excellent Faradaic efficiency and a turnover frequency of 160 s-1 . A DFT computational investigation of the reduction behavior of I and II revealed a correlation of H2 formation with charge donation from electrons originating in a reduced ligand-localized orbital. As a result, these catalysts are proposed to proceed by a novel mechanism involving electron/proton transfer between a Ni0I species bonded to an anionic PN3 P ligand ("L- /Ni0I ") and a NiI -hydride ("Ni-H"). Furthermore, these catalysts are able to reduce phenol and acetic acid, more active proton sources, at lower potentials that correlate with the substrate pKa .
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Affiliation(s)
- Somayeh Norouziyanlakvan
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, ON K1 N 6 N5
| | - Gyandshwar Kumar Rao
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, ON K1 N 6 N5
| | - Jeffrey Ovens
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, ON K1 N 6 N5
| | - Bulat Gabidullin
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, ON K1 N 6 N5
| | - Darrin Richeson
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, ON K1 N 6 N5
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Zhang Z, Fujioka T, Koide T, Yano Y, Ono T, Hisaeda Y. Synthesis of First Antimony Porphycene and Electrocatalytic Hydrogen Evolution Driven by Ligand-Centered Reduction. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210177] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Zhi Zhang
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Taro Fujioka
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Taro Koide
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yoshio Yano
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Toshikazu Ono
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yoshio Hisaeda
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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32
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Tok GC, Reiter S, Freiberg ATS, Reinschlüssel L, Gasteiger HA, de Vivie-Riedle R, Hess CR. H 2 Evolution from Electrocatalysts with Redox-Active Ligands: Mechanistic Insights from Theory and Experiment vis-à-vis Co-Mabiq. Inorg Chem 2021; 60:13888-13902. [PMID: 34297556 DOI: 10.1021/acs.inorgchem.1c01157] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electrocatalytic hydrogen production via transition metal complexes offers a promising approach for chemical energy storage. Optimal platforms to effectively control the proton and electron transfer steps en route to H2 evolution still need to be established, and redox-active ligands could play an important role in this context. In this study, we explore the role of the redox-active Mabiq (Mabiq = 2-4:6-8-bis(3,3,4,4-tetramethlyldihydropyrrolo)-10-15-(2,2-biquinazolino)-[15]-1,3,5,8,10,14-hexaene1,3,7,9,11,14-N6) ligand in the hydrogen evolution reaction (HER). Using spectro-electrochemical studies in conjunction with quantum chemical calculations, we identified two precatalytic intermediates formed upon the addition of two electrons and one proton to [CoII(Mabiq)(THF)](PF6) (CoMbq). We further examined the acid strength effect on the generation of the intermediates. The generation of the first intermediate, CoMbq-H1, involves proton addition to the bridging imine-nitrogen atom of the ligand and requires strong proton activity. The second intermediate, CoMbq-H2, acquires a proton at the diketiminate carbon for which a weaker proton activity is sufficient. We propose two decoupled H2 evolution pathways based on these two intermediates, which operate at different overpotentials. Our results show how the various protonation sites of the redox-active Mabiq ligand affect the energies and activities of HER intermediates.
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Affiliation(s)
- G Ceren Tok
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Sebastian Reiter
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 München, Germany
| | - Anna T S Freiberg
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Leonhard Reinschlüssel
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Hubert A Gasteiger
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Regina de Vivie-Riedle
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 München, Germany
| | - Corinna R Hess
- Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
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33
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Singh C, Haldar A, Basu O, Das SK. Devising a Polyoxometalate-Based Functional Material as an Efficient Electrocatalyst for the Hydrogen Evolution Reaction. Inorg Chem 2021; 60:10302-10314. [PMID: 34185987 DOI: 10.1021/acs.inorgchem.1c00734] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Hydrogen is the solution to all the problems associated with the energy crisis. Generating hydrogen from water splitting is one of the greener approaches, but it requires an efficient catalyst that is economical for the bulk production of hydrogen. The transition metal-aqua coordination complexes, which are otherwise inactive/unstable for electrochemical hydrogen evolution reaction (HER) activity, can efficiently be utilized for the same by attaching these metal-aqua species on a stable support. With a similar approach, we have synthesized and structurally characterized a two-dimensional polyoxometalate (POM)-copper complex hybrid that supports a copper(II)-aqua-bypyridine complex with a molecular formula of the overall system, [{CuII(2,2'-bpy)(H2O)2}][{CoIIWVI12O40}{CuII(2,2'-bpy)(H2O)}{CuII(2,2'-bpy)}]·2H2O (1). The bis(aqua)-mono(bipyridine) Cu(II)-complex fragment {CuII(2,2'-bpy)(H2O)2}2+, attached to the two-dimensional POM-Cu-complex support, acts as an active catalytic center that catalyzes the electrochemical HER. The electrochemical studies done for this work enabled us to understand the role of compound 1 as an electrocatalyst for the HER in near-neutral medium (pH 4.8), under buffered conditions (acetate buffer). Through detailed electrochemical experiments including controlled ones, we understand that compound 1 follows a proton-coupled electron transfer (PCET) pathway with one proton and one electron involvement in the HER. The overpotential required to achieve a current density of 1 mA/cm2 is found to be 520 mV with a Faradaic efficiency of 81%.
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Affiliation(s)
- Chandani Singh
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
| | - Atanu Haldar
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
| | - Olivia Basu
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
| | - Samar K Das
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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34
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Queyriaux N. Redox-Active Ligands in Electroassisted Catalytic H + and CO 2 Reductions: Benefits and Risks. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00237] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicolas Queyriaux
- CNRS, LCC (Laboratoire de Chimie de Coordination), 31077 Toulouse, France
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35
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Recent progress in homogeneous light-driven hydrogen evolution using first-row transition metal catalysts. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.119950] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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36
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Zhang Q, Zhang X, Wang J, Wang C. Graphene-supported single-atom catalysts and applications in electrocatalysis. NANOTECHNOLOGY 2021; 32:032001. [PMID: 33002887 DOI: 10.1088/1361-6528/abbd70] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Supported metal nanostructures are the most extensively studied heterogeneous catalysts, benefiting from easy separation, regeneration and affordable cost. The size of the supported metal species is one of the decisive factors in determining the activity of heterogeneous catalysts. Particularly, the unsaturated coordination environment of metal atoms preferably act as the active centers, minimizing these metal species can significantly boost the specific activity of every single metal atom. Single-atom catalysts/catalysis (SACs), containing isolated metals atomically dispersed on or coordinated with the surface of a support material, represent the ultimate utilization of supported metals and maximize metal usage efficiency. Graphene, a two-dimensional star material, exhibiting extraordinary physical and chemical properties, has been approved as an excellent platform for constructing SACs. When atomically dispersed metal atoms are strongly anchored on the graphene surface, featuring ultra-high surface area and excellent electronic properties, SACs offer a great potential to significantly innovate the conventional heterogeneous catalysis, especially in the field of electrocatalysis. In this review, a detailed discussion of graphene-supported SACs, including preparation approaches, characterization techniques and applications on typical electrocatalytic reactions is provided. The advantages and unique features of graphene-supported SACs as efficient electrocatalysts and the upcoming challenges for improving their performance and further practical applications are also highlighted.
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Affiliation(s)
- Qin Zhang
- CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People's Republic of China
| | - Xiaoxiang Zhang
- CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People's Republic of China
| | - Junzhong Wang
- CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People's Republic of China
| | - Congwei Wang
- CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People's Republic of China
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37
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Polyoxometalate Derived Mo Based Hybrid HER Electrocatalysts with Carbon as Matrix and Their Application in Zn-H+ Battery. J CLUST SCI 2020. [DOI: 10.1007/s10876-020-01928-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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38
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Das A, Hessin C, Ren Y, Desage-El Murr M. Biological concepts for catalysis and reactivity: empowering bioinspiration. Chem Soc Rev 2020; 49:8840-8867. [PMID: 33107878 DOI: 10.1039/d0cs00914h] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Biological systems provide attractive reactivity blueprints for the design of challenging chemical transformations. Emulating the operating mode of natural systems may however not be so easy and direct translation of structural observations does not always afford the anticipated efficiency. Metalloenzymes rely on earth-abundant metals to perform an incredibly wide range of chemical transformations. To do so, enzymes in general have evolved tools and tricks to enable control of such reactivity. The underlying concepts related to these tools are usually well-known to enzymologists and bio(inorganic) chemists but may be a little less familiar to organometallic chemists. So far, the field of bioinspired catalysis has greatly focused on the coordination sphere and electronic effects for the design of functional enzyme models but might benefit from a paradigm shift related to recent findings in biological systems. The goal of this review is to bring these fields closer together as this could likely result in the development of a new generation of highly efficient bioinspired systems. This contribution covers the fields of redox-active ligands, entatic state reactivity, energy conservation through electron bifurcation, and quantum tunneling for C-H activation.
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Affiliation(s)
- Agnideep Das
- Université de Strasbourg, Institut de Chimie, UMR CNRS 7177, 67000 Strasbourg, France.
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39
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Chowdhury SN, Biswas S, Das P, Paul S, Biswas AN. Oxygen Reduction Assisted by the Concert of Redox Activity and Proton Relay in a Cu(II) Complex. Inorg Chem 2020; 59:14012-14022. [PMID: 32916051 DOI: 10.1021/acs.inorgchem.0c01776] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
A copper complex, [Cu(dpaq)](ClO4) (1), of a monoanionic pentadentate amidate ligand (dpaq) has been isolated and characterized to study its efficacy toward electrocatalytic reduction of oxygen in neutral aqueous medium. The Cu(II) mononuclear complex, poised in a distorted trigonal bipyramidal structure, reduces oxygen at an onset potential of 0.50 V vs RHE. Kinetics study by hydrodynamic voltammetry and chronoamperometry suggests a stepwise mechanism for sequential reduction of O2 to H2O2 to H2O at a single-site Cu-catalyst. The foot-of-the-wave analysis records a turnover frequency of 5.65 × 102 s-1. At pH 7.0, complex 1 undergoes a quasi-reversible mixed metal-ligand-based reduction and triggers the reduction of dioxygen to water. Electrochemical studies in tandem with quantum chemical investigation, conducted at different redox states, portray the active participation of ligand in completing the process of proton-coupled electron transfer internally. The protonated carboxamido moiety acts as a proton relay, while the quinoline-based orbital supplies the necessary redox equivalent for the conversion of complex 1 to Cu(II)-hydroperoxo species. Thus, a suitable combination of redox non-innocence and proton shuttling functionality in the ligand makes it an effective electron-proton-transfer mediator and subsequently assists the process of oxygen reduction.
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Affiliation(s)
- Srijan Narayan Chowdhury
- Department of Chemistry, National Institute of Technology Sikkim, Barfung Block, Ravangla, South Sikkim 737139, India
| | - Sachidulal Biswas
- Department of Chemistry, National Institute of Technology Sikkim, Barfung Block, Ravangla, South Sikkim 737139, India
| | - Purak Das
- Department of Chemistry, Rishi Bankim Chandra College for Women, Naihati 743165, India
| | - Satadal Paul
- Department of Science and Humanities, Darjeeling Polytechnic, Kurseong 734203, India
| | - Achintesh N Biswas
- Department of Chemistry, National Institute of Technology Sikkim, Barfung Block, Ravangla, South Sikkim 737139, India
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40
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Spielvogel KD, Luna JA, Loria SM, Weisburn LP, Stumme NC, Ringenberg MR, Durgaprasad G, Keith JM, Shaw SK, Daly SR. Influence of Multisite Metal-Ligand Cooperativity on the Redox Activity of Noninnocent N 2S 2 Ligands. Inorg Chem 2020; 59:10845-10853. [PMID: 32639726 DOI: 10.1021/acs.inorgchem.0c01353] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metal-ligand cooperativity (MLC) relies on chemically reactive ligands to assist metals with small-molecule binding and activation, and it has facilitated unprecedented examples of catalysis with metal complexes. Despite growing interest in combining ligand-centered chemical and redox reactions for chemical transformations, there are few studies demonstrating how chemically engaging redox active ligands in MLC affects their electrochemical properties when bound to metals. Here we report stepwise changes in the redox activity of model Ru complexes as zero, one, and two BH3 molecules undergo MLC binding with a triaryl noninnocent N2S2 ligand derived from o-phenylenediamine (L1). A similar series of Ru complexes with a diaryl N2S2 ligand with ethylene substituted in place of phenylene (L2) is also described to evaluate the influence of the o-phenylenediamine subunit on redox activity and MLC. Cyclic voltammetry (CV) studies and density functional theory (DFT) calculations show that MLC attenuates ligand-centered redox activity in both series of complexes, but electron transfer is still achieved when only one of the two redox-active sites on the ligands is chemically engaged. The results demonstrate how incorporating more than one multifunctional reactive site could be an effective strategy for maintaining redox noninnocence in ligands that are also chemically reactive and competent for MLC.
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Affiliation(s)
- Kyle D Spielvogel
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Javier A Luna
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Sydney M Loria
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Leah P Weisburn
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Nathan C Stumme
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Mark R Ringenberg
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Gummadi Durgaprasad
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Jason M Keith
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Scott K Shaw
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Scott R Daly
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
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41
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Triphos nickel(II) halide pincer complexes as robust proton reduction electrocatalysts. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.110950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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42
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Xiao WC, Tao YW, Zhao Y, Luo JX, Lai WZ. Synthesis, crystal structure and photochemical H2 generation of a Co-based supramolecular assembly containing a bisthienyl Bodipy sensitizer. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.107800] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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43
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Papanikolaou MG, Elliott A, McAllister J, Gallos JK, Keramidas AD, Kabanos TA, Sproules S, Miras HN. Electrocatalytic hydrogen production by dinuclear cobalt(ii) compounds containing redox-active diamidate ligands: a combined experimental and theoretical study. Dalton Trans 2020; 49:15718-15730. [PMID: 33146215 DOI: 10.1039/d0dt02617d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The chiral dicobalt(ii) complex [CoII2(μ2-L)2] (1) (H2L = N2,N6-di(quinolin-8-yl)pyridine-2,6-dicarboxamide) and its tert-butyl analogue [CoII2(μ2-LBu)2] (2) were structurally characterized and their catalytic evolution of H2 was investigated.
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Affiliation(s)
| | | | - James McAllister
- West CHEM
- School of Chemistry
- University of Glasgow
- Glasgow G12 8QQ
- UK
| | - John K. Gallos
- Department of Chemistry
- Aristotle University of Thessaloniki
- Thessaloniki GR 541 24
- Greece
| | | | | | - Stephen Sproules
- West CHEM
- School of Chemistry
- University of Glasgow
- Glasgow G12 8QQ
- UK
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44
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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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45
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Oloyede HO, Woods JAO, Görls H, Plass W, Eseola AO. New cobalt( ii) coordination designs and the influence of varying chelate characters, ligand charges and incorporated group I metal ions on enzyme-like oxidative coupling activity. NEW J CHEM 2020. [DOI: 10.1039/d0nj02347g] [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
In transition-metal-mediated catalysis, design of new, well defined coordination architectures and subjecting them to catalysis testing under the same reaction conditions is a necessity tool for improved understanding of desirable active site geometries and characteristics.
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Affiliation(s)
| | | | - Helmar Görls
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Abiodun Omokehinde Eseola
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
- Materials Chemistry Group
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46
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Xie A, Tao YW, Peng C, Luo GG. A nickel pyridine-selenolate complex for the photocatalytic evolution of hydrogen from aqueous solutions. INORG CHEM COMMUN 2019. [DOI: 10.1016/j.inoche.2019.107598] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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47
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Affiliation(s)
- Vishakha Kaim
- Department of Chemistry; University of Delhi; 110007 Delhi India
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48
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Barrozo A, Orio M. Molecular Electrocatalysts for the Hydrogen Evolution Reaction: Input from Quantum Chemistry. CHEMSUSCHEM 2019; 12:4905-4915. [PMID: 31557393 DOI: 10.1002/cssc.201901828] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 08/22/2019] [Indexed: 06/10/2023]
Abstract
In the pursuit of carbon-free fuels, hydrogen can be considered as an apt energy carrier. The design of molecular electrocatalysts for hydrogen production is important for the development of renewable energy sources that are abundant, inexpensive, and environmentally benign. Over the last 20 years, a large number of electrocatalysts have been developed, and considerable efforts have been directed toward the design of earth-abundant, first-row transition-metal complexes capable of promoting electrocatalytic hydrogen evolution reaction (HER). In this context, numerical approaches have emerged as powerful tools to study the catalytic performances of these complexes. This review covers some of the most significant theoretical mechanistic studies of biomimetic and bioinspired homogeneous HER catalysts. The approaches employed to study the free energy landscapes are discussed and methods used to obtain accurate estimates of relevant observables required to study the HER are presented. Furthermore, the structural and electronic parameters that govern the reactivity, and are necessary to achieve efficient hydrogen production, are discussed in view of future research directions.
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Affiliation(s)
- Alexandre Barrozo
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397, Marseille, France
| | - Maylis Orio
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397, Marseille, France
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49
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Tok GC, Freiberg ATS, Gasteiger HA, Hess CR. Electrocatalytic H
2
Evolution by the Co‐Mabiq Complex Requires Tempering of the Redox‐Active Ligand. ChemCatChem 2019. [DOI: 10.1002/cctc.201900953] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- G. Ceren Tok
- Chair of Technical Electrochemistry Chemistry Department and Catalysis Research CenterTechnical University of Munich Lichtenbergstr. 4 Garching bei Munich Germany
- Chemistry Department and Catalysis Research CenterTechnical University of Munich Lichtenbergstr. 4 Garching bei Munich Germany
| | - Anna T. S. Freiberg
- Chair of Technical Electrochemistry Chemistry Department and Catalysis Research CenterTechnical University of Munich Lichtenbergstr. 4 Garching bei Munich Germany
| | - Hubert A. Gasteiger
- Chair of Technical Electrochemistry Chemistry Department and Catalysis Research CenterTechnical University of Munich Lichtenbergstr. 4 Garching bei Munich Germany
| | - Corinna R. Hess
- Chemistry Department and Catalysis Research CenterTechnical University of Munich Lichtenbergstr. 4 Garching bei Munich Germany
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50
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Self-Assembled Monolayers of Molybdenum Sulfide Clusters on Au Electrode as Hydrogen Evolution Catalyst for Solar Water Splitting. INORGANICS 2019. [DOI: 10.3390/inorganics7060079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Hydrogen evolution reaction (HER) activities of self-assembled monolayers (SAMs) of [Mo3S7(S2CNMe2)3] and several other MoSx molecular clusters are presented on planer Au electrode. Our study suggests that such Mo-S clusters are unstable under HER reaction conditions of a strongly acidic electrolyte. The [Mo3S7(S2CNEt2)3]I monolayer prepared from DMF showed greater stability among all the studied precursors. The X-ray photoelectron spectroscopy (XPS) analysis on a monolayer of [Mo3S7(S2CNMe2)3]I in THF assembled on Au/ITO suggested sulfur-rich composition with S:Mo ratio of 2.278. The Mo-S monolayer clusters resulting from [Mo3S7(S2CNMe2)3]I in THF showed a Tafel slope of 75.74 mV dec−1 and required a lower overpotential of 410 mV to reach a high HER catalytic current density of 100 mA cm−2 compared to the other studied precursors. Surface coverage of the Mo-S clusters on the Au surface was confirmed by cyclic voltammetry (CV) curves from K3Fe(CN)6 and anodization of Au surface. Further, the rotating ring-disk electrode (RRDE) measurements were performed for the monolayer of [Mo3S7(S2CNMe2)3]I prepared in THF to study its reaction kinetics. The HER catalytic activity of such monolayer Mo-S clusters can further be improved by controlling the sulfur vacancy.
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