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Yu S, Kim N, Choe JH, Kim H, Kim DW, Youn J, Lee YH, Hong CS. Postsynthetically Modified Alkoxide-Exchanged Ni 2(OR) 2BTDD: Synergistic Interactions of CO 2 with Open Metal Sites and Functional Groups. Angew Chem Int Ed Engl 2024; 63:e202400855. [PMID: 38503692 DOI: 10.1002/anie.202400855] [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: 01/15/2024] [Revised: 03/18/2024] [Accepted: 03/19/2024] [Indexed: 03/21/2024]
Abstract
Postsynthetic modifications (PSMs) of metal-organic frameworks (MOFs) play a crucial role in enhancing material performance through open metal site (OMS) functionalization or ligand exchange. However, a significant challenge persists in preserving open metal sites during ligand exchange, as these sites are inherently bound by incoming ligands. In this study, for the first time, we introduced alkoxides by exchanging bridging chloride in Ni2Cl2BTDD (BTDD=bis (1H-1,2,3,-triazolo [4,5-b],-[4',5'-i]) dibenzo[1,4]dioxin) through PSM. Rietveld refinement of synchrotron X-ray diffraction data indicated that the alkoxide oxygen atom bridges Ni(II) centers while the OMSs of the MOF are preserved. Due to the synergy of the existing OMS and introduced functional group, the alkoxide-exchanged MOFs showed CO2 uptakes superior to the pristine MOF. Remarkably, the tert-butoxide-substituted Ni_T exhibited a nearly threefold and twofold increase in CO2 uptake compared to Ni2Cl2BTDD at 0.15 and 1 bar, respectively, as well as high water stability relative to the other exchanged frameworks. Furthermore, the Grand Canonical Monte Carlo simulations for Ni_T suggested that CO2 interacts with the OMS and the surrounding methyl groups of tert-butoxide groups, which is responsible for the enhanced CO2 capacity. This work provides a facile and unique synthetic strategy for realizing a desirable OMS-incorporating MOF platform through bridging ligand exchange.
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Affiliation(s)
- Sumin Yu
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Namju Kim
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Jong Hyeak Choe
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Hyojin Kim
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Dae Won Kim
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Jeongwon Youn
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Yong Hoon Lee
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Chang Seop Hong
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
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2
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Oktavian R, Goeminne R, Glasby LT, Song P, Huynh R, Qazvini OT, Ghaffari-Nik O, Masoumifard N, Cordiner JL, Hovington P, Van Speybroeck V, Moghadam PZ. Gas adsorption and framework flexibility of CALF-20 explored via experiments and simulations. Nat Commun 2024; 15:3898. [PMID: 38724490 PMCID: PMC11081952 DOI: 10.1038/s41467-024-48136-0] [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: 10/10/2023] [Accepted: 04/18/2024] [Indexed: 05/12/2024] Open
Abstract
In 2021, Svante, in collaboration with BASF, reported successful scale up of CALF-20 production, a stable MOF with high capacity for post-combustion CO2 capture which exhibits remarkable stability towards water. CALF-20's success story in the MOF commercialisation space provides new thinking about appropriate structural and adsorptive metrics important for CO2 capture. Here, we combine atomistic-level simulations with experiments to study adsorptive properties of CALF-20 and shed light on its flexible crystal structure. We compare measured and predicted CO2 and water adsorption isotherms and explain the role of water-framework interactions and hydrogen bonding networks in CALF-20's hydrophobic behaviour. Furthermore, regular and enhanced sampling molecular dynamics simulations are performed with both density-functional theory (DFT) and machine learning potentials (MLPs) trained to DFT energies and forces. From these simulations, the effects of adsorption-induced flexibility in CALF-20 are uncovered. We envisage this work would encourage development of other MOF materials useful for CO2 capture applications in humid conditions.
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Affiliation(s)
- Rama Oktavian
- Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield, S1 3JD, UK
| | - Ruben Goeminne
- Center for Molecular Modeling (CMM), Ghent University, Technologiepark 46, 9052, Zwijnaarde, Belgium
| | - Lawson T Glasby
- Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield, S1 3JD, UK
| | - Ping Song
- Svante Inc., 8800 Glenlyon Pkwy, Burnaby, BC, V5J 5K3, Canada
| | - Racheal Huynh
- Svante Inc., 8800 Glenlyon Pkwy, Burnaby, BC, V5J 5K3, Canada
| | | | | | | | - Joan L Cordiner
- Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield, S1 3JD, UK
| | | | - Veronique Van Speybroeck
- Center for Molecular Modeling (CMM), Ghent University, Technologiepark 46, 9052, Zwijnaarde, Belgium
| | - Peyman Z Moghadam
- Department of Chemical Engineering, University College London, London, WC1E 7JE, UK.
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3
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Ganai A, Ball B, Sarkar P. Modulating the Energetics of C-H Bond Activation in Methane by Utilizing Metalated Porphyrinic Metal-Organic Frameworks. J Phys Chem Lett 2023; 14:1832-1839. [PMID: 36779674 DOI: 10.1021/acs.jpclett.2c03891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
In recent years, much effort has been directed toward utilizing metal-organic frameworks (MOFs) for activating C-H bonds of light alkanes. The energy demanding steps involved in the catalytic pathway are the formation of metal-oxo species and the subsequent cleavage of the C-H bonds of alkanes. With the intention of exploring the tunability of the activation barriers involved in the catalytic pathway of methane hydroxylation, we have employed density functional theory to model metalated porphyrinic MOFs (MOF-525(M)). We find that the heavier congeners down a particular group have high exothermic oxo-formation enthalpies ΔHO and hence are associated with low N2O activation barriers. Independent analyses of activation barriers and structure-activity relationship leads to the conclusion that MOF-525(Ru) and MOF-525(Ir) can act as an effective catalysts for methane hydroxylation. Hence, ΔHO has been found to act as a guide, in the first place, in choosing the optimum catalyst for methane hydroxylation from a large set of available systems.
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Affiliation(s)
- Anjali Ganai
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, India
| | - Biswajit Ball
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, India
| | - Pranab Sarkar
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, India
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Yang RA, Sarazen ML. Mechanistic Impacts of Metal Site and Solvent Identities for Alkene Oxidation over Carboxylate Fe and Cr Metal–Organic Frameworks. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Rachel A. Yang
- Department of Chemical and Biological Engineering, Princeton University, 41 Olden Street, Princeton, New Jersey08544, United States of America
| | - Michele L. Sarazen
- Department of Chemical and Biological Engineering, Princeton University, 41 Olden Street, Princeton, New Jersey08544, United States of America
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5
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Nandy A, Duan C, Goffinet C, Kulik HJ. New Strategies for Direct Methane-to-Methanol Conversion from Active Learning Exploration of 16 Million Catalysts. JACS AU 2022; 2:1200-1213. [PMID: 35647589 PMCID: PMC9135396 DOI: 10.1021/jacsau.2c00176] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 04/12/2022] [Accepted: 04/15/2022] [Indexed: 05/03/2023]
Abstract
Despite decades of effort, no earth-abundant homogeneous catalysts have been discovered that can selectively oxidize methane to methanol. We exploit active learning to simultaneously optimize methane activation and methanol release calculated with machine learning-accelerated density functional theory in a space of 16 M candidate catalysts including novel macrocycles. By constructing macrocycles from fragments inspired by synthesized compounds, we ensure synthetic realism in our computational search. Our large-scale search reveals that low-spin Fe(II) compounds paired with strong-field (e.g., P or S-coordinating) ligands have among the best energetic tradeoffs between hydrogen atom transfer (HAT) and methanol release. This observation contrasts with prior efforts that have focused on high-spin Fe(II) with weak-field ligands. By decoupling equatorial and axial ligand effects, we determine that negatively charged axial ligands are critical for more rapid release of methanol and that higher-valency metals [i.e., M(III) vs M(II)] are likely to be rate-limited by slow methanol release. With full characterization of barrier heights, we confirm that optimizing for HAT does not lead to large oxo formation barriers. Energetic span analysis reveals designs for an intermediate-spin Mn(II) catalyst and a low-spin Fe(II) catalyst that are predicted to have good turnover frequencies. Our active learning approach to optimize two distinct reaction energies with efficient global optimization is expected to be beneficial for the search of large catalyst spaces where no prior designs have been identified and where linear scaling relationships between reaction energies or barriers may be limited or unknown.
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Affiliation(s)
- Aditya Nandy
- Department
of Chemical Engineering, Massachusetts Institute
of Technology, Cambridge, Massachusetts 02139, United States
- Department
of Chemistry, Massachusetts Institute of
Technology, Cambridge, Massachusetts 02139, United States
| | - Chenru Duan
- Department
of Chemical Engineering, Massachusetts Institute
of Technology, Cambridge, Massachusetts 02139, United States
- Department
of Chemistry, Massachusetts Institute of
Technology, Cambridge, Massachusetts 02139, United States
| | - Conrad Goffinet
- Department
of Chemical Engineering, Massachusetts Institute
of Technology, Cambridge, Massachusetts 02139, United States
| | - Heather J. Kulik
- Department
of Chemical Engineering, Massachusetts Institute
of Technology, Cambridge, Massachusetts 02139, United States
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6
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Rosen AS, Notestein JM, Snurr RQ. Exploring mechanistic routes for light alkane oxidation with an iron-triazolate metal-organic framework. Phys Chem Chem Phys 2022; 24:8129-8141. [PMID: 35332353 DOI: 10.1039/d2cp00963c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, we computationally explore the formation and subsequent reactivity of various iron-oxo species in the iron-triazolate framework Fe2(μ-OH)2(bbta) (H2bbta = 1H,5H-benzo(1,2-d:4,5-d')bistriazole) for the catalytic activation of strong C-H bonds. With the direct conversion of methane to methanol as the probe reaction of interest, we use density functional theory (DFT) calculations to evaluate multiple mechanistic pathways in the presence of either N2O or H2O2 oxidants. These calculations reveal that a wide range of transition metal-oxo sites - both terminal and bridging - are plausible in this family of metal-organic frameworks, making it a unique platform for comparing the electronic structure and reactivity of different proposed active site motifs. Based on the DFT calculations, we predict that Fe2(μ-OH)2(bbta) would exhibit a relatively low barrier for N2O activation and energetically favorable formation of an [Fe(O)]2+ species that is capable of oxidizing C-H bonds. In contrast, the use of H2O2 as the oxidant is predicted to yield an assortment of bridging iron-oxo sites that are less reactive. We also find that abstracting oxo ligands can exhibit a complex mixture of both positive and negative spin density, which may have broader implications for relating the degree of radical character to catalytic activity. In general, we consider the coordinatively unsaturated iron sites to be promising for oxidation catalysis, and we provide several recommendations on how to further tune the catalytic properties of this family of metal-triazolate frameworks.
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Affiliation(s)
- Andrew S Rosen
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA.
| | - Justin M Notestein
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA.
| | - Randall Q Snurr
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA.
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Yang RA, Sarazen ML. Reaction pathways and deactivation mechanisms of isostructural Cr and Fe MIL-101 during liquid-phase styrene oxidation by hydrogen peroxide. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00567g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Isostructural MIL-101(Cr, Fe) is investigated as a modular platform to quantify differences in reactivity, selectivity, and deactivation as functions of intrinsic material properties for styrene oxidation by hydrogen peroxide at mild conditions.
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Affiliation(s)
- Rachel A. Yang
- Department of Chemical and Biological Engineering
- Princeton University
- Princeton
- USA
| | - Michele L. Sarazen
- Department of Chemical and Biological Engineering
- Princeton University
- Princeton
- USA
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8
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Lyu P, Maurin G. Mechanistic Insight into the Catalytic NO Oxidation by the MIL-100 MOF Platform: Toward the Prediction of More Efficient Catalysts. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02219] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Pengbo Lyu
- ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier 34095, France
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