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Thompson JA, Vilà-Nadal L. Computation of 31P NMR chemical shifts in Keggin-based lacunary polyoxotungstates. Dalton Trans 2024; 53:564-571. [PMID: 38054391 DOI: 10.1039/d3dt02694a] [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
Density Functional Theory (DFT) calculations were employed to systematically study the accuracy of various exchange-correlation functionals in reproducing experimental 31P NMR chemical shifts, δExp(31P) for Keggin, [PW12O40]3- and corresponding lacunary clusters: [PW11O39]7-, [A-PW9O34]9-, and [B-PW9O34]9-. Initially, computed chemical shifts, δCalc(31P) were obtained with without neutralising their charge in which associated error, δError(31P), decreased as a function of Hartree-Fock (HF) exchange, attributed to constriction of the P-O tetrahedron. By comparison, δCalc(31P) performed with explicitly located counterions to render the system charge neutral, reduced discrepancies, δError(31P) by 1-2 ppm. However, uncertainties in δCalc(31P) remain, particularly for [B-PW9O34]9- anions attributed to direct electrostatic interactions between the counterions and the central tetrahedron. Optimal results were achieved using the PBE/TZP//PBE0/TZP method, achieving a mean absolute error (MAE) and a mean squared error (MSE) of 4.03 ppm. Our results emphasize that understanding the nature of the electrolyte and solvent environment is essential to obtaining reasonable agreement between theoretical and experimental results.
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Thompson JA, González-Cabaleiro R, Vilà-Nadal L. Reducing Systematic Uncertainty in Computed Redox Potentials for Aqueous Transition-Metal-Substituted Polyoxotungstates. Inorg Chem 2023; 62:12260-12271. [PMID: 37489885 PMCID: PMC10410613 DOI: 10.1021/acs.inorgchem.3c01115] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Indexed: 07/26/2023]
Abstract
Polyoxometalates have attracted significant interest owing to their structural diversity, redox stability, and functionality at the nanoscale. In this work, density functional theory calculations have been employed to systematically study the accuracy of various exchange-correlation functionals in reproducing experimental redox potentials, U0Red in [PW11M(H2O)O39]q- M = Mn(III/II), Fe(III/II), Co(III/II), and Ru(III/II). U0Red calculations for [PW11M(H2O)O39]q- were calculated using a conductor-like screening model to neutralize the charge in the cluster. We explicitly located K+ counterions which induced positive shifting of potentials by > 500 mV. This approximation improved the reproduction of redox potentials for Kx[XW11M(H2O)O39]q-x M = Mn(III/II)/Co(III/II). However, uncertainties in U0Red for Kx[PW11M(H2O)O39]q-x M = Fe(III/II)/Ru(III/II) were observed because of the over-stabilization of the ion-pairs. Hybrid functionals exceeding 25% Hartree-Fock exchange are not recommended because of large uncertainties in ΔU0Red attributed to exaggerated proximity of the ion-pairs. Our results emphasize that understanding the nature of the electrode and electrolyte environment is essential to obtain a reasonable agreement between theoretical and experimental results.
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Affiliation(s)
- Jake A. Thompson
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
| | | | - Laia Vilà-Nadal
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
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Controlled synthesis of efficient NiWS active phases derived from lacunary polyoxometalate and the application in hydrodesulfurization†. J Catal 2022. [DOI: 10.1016/j.jcat.2022.06.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Tian XJ, Yu YZ, Lu Q, Zhang XM. Organic-Inorganic High-Valence Sn 18-oxo Clusters: Direct Utilization of an Inorganic Sn(IV) Source to Improve the Nuclearity and Electrocatalytic CO 2 Reduction Properties. Inorg Chem 2022; 61:6037-6044. [PMID: 35411766 DOI: 10.1021/acs.inorgchem.2c00038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The high-valence tin-oxo clusters are of great significance because of their structural diversity and potential applications in many fields, e.g., catalysis, extreme ultraviolet (EUV) lithography, and so on. The synthesis of high-nuclearity tin-oxo clusters remains a great challenge currently, since the key inorganic SnxOy core with Sn4+ ions could not be obtained only by the in situ Sn-C bond cleavage in organic tin sources. In this context, we synthesize three organic-inorganic hybrid Sn18-oxo clusters, [(BuSn)12Sn6(μ3-O)20(ba)12(PhPO3)4] (Bu = butyl, Hba = benzoic acid), [(BuSn)12Sn6(μ3-O)20(pmba)12(PhPO3)4]·2CH3CN·2H2O (Hpmba = p-toluic acid), and [(BuSn)12Sn6(μ3-O)20(ptba)12(PhPO3)4]·2CH3CN·2iPrOH·2H2O (Hptba = p-tert-butyl benzoic acid), as well as one Sn6-oxo cluster [(BuSn)6(μ3-O)2(μ2-OH)4(pnba)6(PhPO3)2] (Sn6) (Hpnba = p-nitrobenzoic acid) by combining an inorganic precursor (SnCl4) with an organic one (butyltin hydroxide oxide). It is shown that an inorganic dicyclo-chain-like Sn6O8 core encapsulated in a U-shaped dodecanuclear butyltin-oxo ring plays an important role in the construction of Sn18-oxo clusters and that the use of a ligand with an electron-withdrawing group reduces the nuclearity of clusters to Sn6. Moreover, electrocatalytic CO2 reduction studies confirm that the electrocatalytic activities of the Sn18 clusters are superior to those of the Sn6 cluster, probably due to the hybrid organotin-inorganotin structures. Our work not only opens a new way for constructing high-nuclearity tin-oxo clusters but also is helpful in deeply revealing the structure-properties relationship of tin-oxo clusters.
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Affiliation(s)
- Xiu-Juan Tian
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), College of Chemistry & Material Science, Shanxi Normal University, Taiyuan 030031, P. R. China
| | - You-Zhu Yu
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), College of Chemistry & Material Science, Shanxi Normal University, Taiyuan 030031, P. R. China
| | - Qian Lu
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), College of Chemistry & Material Science, Shanxi Normal University, Taiyuan 030031, P. R. China
| | - Xian-Ming Zhang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), College of Chemistry & Material Science, Shanxi Normal University, Taiyuan 030031, P. R. China.,College of Chemistry, Key Laboratory of Interface Science and Engineering in Advanced Material (Ministry of Education), Taiyuan University of Technology, Taiyuan 030024, P. R. China
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Ikeda K, Yoshizawa K, Shiota Y. Theoretical Investigation into Selective Benzene Hydroxylation by Ruthenium-Substituted Keggin-Type Polyoxometalates. Inorg Chem 2021; 61:10-14. [PMID: 34890508 DOI: 10.1021/acs.inorgchem.1c02605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Benzene hydroxylation catalyzed by ruthenium-substituted Keggin-type polyoxometalates [RuV(O)XW11O39]n- (RuVOX; X = Al, Ga, Si, Ge, P, As, S; heteroatoms; 3 ≤ n ≤ 6) is investigated using the density functional theory approach. As a possible side reaction, the water oxidation reaction is also considered. We found that the rate-determining step for water oxidation by RuVOX requires a higher activation free energy than the benzene hydroxylation reaction, suggesting that all of the RuVOX catalysts show high chemoselectivity toward benzene hydroxylation. Additionally, the heteroatom effect in benzene hydroxylation by RuVOX is discussed. The replacement of Si by X induces changes in the bond length of μ4O-X, resulting in a change in the activation free energy for benzene hydroxylation by RuVOX. Consequentially, RuVOS is expected to be the most effective catalyst among the (RuVOX) catalysts for the benzene hydroxylation reaction.
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Affiliation(s)
- Kei Ikeda
- Institute for Materials Chemistry and Engineering and Integrated Research Consortium on Chemical Science, Kyushu University, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering and Integrated Research Consortium on Chemical Science, Kyushu University, Fukuoka 819-0395, Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering and Integrated Research Consortium on Chemical Science, Kyushu University, Fukuoka 819-0395, Japan
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Abstract
Polyoxometalates (POMs) have been used for spectrophotometric determinations of silicon and phosphorus under acidic conditions, referred to as the molybdenum yellow method and molybdenum blue method, respectively. Many POMs are redox active and exhibit fascinating but complicated voltammetric responses. These compounds can reversibly accommodate and release many electrons without exhibiting structural changes, implying that POMs can function as excellent mediators and can be applied to sensitive determination methods based on catalytic electrochemical reactions. In addition, some rare-earth-metal-incorporated POMs exhibit fluorescence, which enables sensitive determination by the enhancement and quenching of fluorescence intensities. In this review, various analytical applications of POMs are introduced, mainly focusing on papers published after 2000, except for the molybdenum yellow method and molybdenum blue method.
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Affiliation(s)
- Tadaharu Ueda
- Department of Marine Resource Science Faculty of Agriculture and Marine Science, Kochi University, Nankoku, 783-8502, Japan. .,Center for Advanced Marine Core Research, Kochi University, Nankoku, 783-8502, Japan.
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Wang D, Zhao Z, Lin S, Song Y, Su Z, Chen J. The 3D POMOFs based two AsIII-capped Keggin arsenomolybdates with four VIV substituted: Synthesis, structures and properties. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121639] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Gong LG, Wang CX, Qi XX, Yu K, Zhou BB. [Ag(Bipy) 2] + modified butterfly-like compound: synthesis, structure, and photo/electrocatalytic properties. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1804555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Li-Ge Gong
- Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin, China
- Key Laboratory of Molecular and Cytogenetics, College of Life Science and Technology, Harbin Normal University, Harbin, Heilongjiang Province, China
| | - Chun-Xiao Wang
- Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin, China
| | - Xian-Xian Qi
- Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin, China
| | - Kai Yu
- Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin, China
- Key Laboratory of Molecular and Cytogenetics, College of Life Science and Technology, Harbin Normal University, Harbin, Heilongjiang Province, China
| | - Bai-Bin Zhou
- Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin, China
- Key Laboratory of Molecular and Cytogenetics, College of Life Science and Technology, Harbin Normal University, Harbin, Heilongjiang Province, China
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