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Klingler S, Hlavatsch M, Bagemihl B, Mengele AK, Gaus AL, von Delius M, Rau S, Mizaikoff B. An Algebraic Blueprint for Predicting Turnover Numbers and Endpoints in Photocatalysis. Chemphyschem 2024; 25:e202300767. [PMID: 38084394 DOI: 10.1002/cphc.202300767] [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: 10/17/2023] [Revised: 12/07/2023] [Indexed: 01/12/2024]
Abstract
Photocatalysis is a contemporary research field given that the world's fossil energy resources including coal, mineral oil and natural gas are finite. The vast variety of photocatalytic systems demands for standardized protocols facilitating an objective comparison. While there are commonly accepted performance indicators such as the turnover number (TON) that are usually reported, to date there is no unified concept for the determination of TONs and the endpoint of the reaction during continuous measurements. Herein, we propose an algebraic approach using defined parameters and boundary conditions based on partial-least squares regression for generically calculating and predicting the turnover number and the endpoint of a photocatalytic experiment. Furthermore, the impact of the analysis period was evaluated with respect to the fidelity of the obtained TON, and the influence of the data point density along critical segments of the obtained fitting function is demonstrated.
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Affiliation(s)
- Sarah Klingler
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Michael Hlavatsch
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Benedikt Bagemihl
- Institute of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Alexander K Mengele
- Institute of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Anna-Laurine Gaus
- Institute of Organic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Max von Delius
- Institute of Organic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Sven Rau
- Institute of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Boris Mizaikoff
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
- Hahn-Schickard, Sedanstraße 14, 89077, Ulm, Germany
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Barsøe LR, Saravanamurugan S, Taarning E, Espin JSM, Meier S. Heterogeneous Base‐Catalyzed Conversion of Glycolaldehyde to Aldotetroses: Mechanistic and Kinetic Insight. ChemCatChem 2021. [DOI: 10.1002/cctc.202101347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Linette Rønn Barsøe
- New Business R&D Haldor Topsøe A/S 2800-Kgs. Lyngby Denmark
- Department of Chemistry Technical University of Denmark Kemitorvet 2800-Kgs. Lyngby Denmark
| | | | - Esben Taarning
- New Business R&D Haldor Topsøe A/S 2800-Kgs. Lyngby Denmark
| | | | - Sebastian Meier
- Department of Chemistry Technical University of Denmark Kemitorvet 2800-Kgs. Lyngby Denmark
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Schaper G, Wenzel M, Hennersdorf F, Lindoy LF, Weigand JJ. Saccharified Uranyl Ions: Self-Assembly of UO 2 2+ into Trinuclear Anionic Complexes by the Coordination of Glucosamine-Derived Schiff Bases. Chemistry 2021; 27:8484-8491. [PMID: 33871115 PMCID: PMC8252515 DOI: 10.1002/chem.202100546] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Indexed: 11/12/2022]
Abstract
The reaction of UO2 (OAc)2 ⋅ 2H2 O with the biologically inspired ligand 2-salicylidene glucosamine (H2 L1 ) results in the formation of the anionic trinuclear uranyl complex [(UO2 )3 (μ3 -O)(L1 )3 ]2- (12- ), which was isolated in good yield as its Cs-salt, [Cs]2 1. Recrystallization of [Cs]2 1 in the presence of 18-crown-6 led to formation of a neutral ion pair of type [M(18-crown-6)]2 1, which was also obtained for the alkali metal ions Rb+ and K+ (M=Cs, Rb, K). The related ligand, 2-(2-hydroxy-1-naphthylidene) glucosamine (H2 L2 ) in a similar procedure with Cs+ gave the corresponding complex [Cs(18-crown-6)]2 [(UO2 )3 (μ3 -O)(L2 )3 ([Cs(18-crown-6)]2 2). From X-ray investigations, the [(UO2 )3 O(Ln )3 ]2- anion (n=1, 2) in each complex is a discrete trinuclear uranyl species that coordinates to the alkali metal ion via three uranyl oxygen atoms. The coordination behavior of H2 L1 and H2 L2 towards UO2 2+ was investigated by NMR, UV/Vis spectroscopy and mass spectrometry, revealing the in situ formation of the 12- and 22- dianions in solution.
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Affiliation(s)
- Gerrit Schaper
- Faculty of Chemistry and Food ChemistryTechnische Universität Dresden01062DresdenGermany
| | - Marco Wenzel
- Faculty of Chemistry and Food ChemistryTechnische Universität Dresden01062DresdenGermany
| | - Felix Hennersdorf
- Faculty of Chemistry and Food ChemistryTechnische Universität Dresden01062DresdenGermany
| | | | - Jan J. Weigand
- Faculty of Chemistry and Food ChemistryTechnische Universität Dresden01062DresdenGermany
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De Cesare S, McKenna CA, Mulholland N, Murray L, Bella J, Campopiano DJ. Direct monitoring of biocatalytic deacetylation of amino acid substrates by 1H NMR reveals fine details of substrate specificity. Org Biomol Chem 2021; 19:4904-4909. [PMID: 33998641 DOI: 10.1039/d1ob00122a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Amino acids are key synthetic building blocks that can be prepared in an enantiopure form by biocatalytic methods. We show that the l-selective ornithine deacetylase ArgE catalyses hydrolysis of a wide-range of N-acyl-amino acid substrates. This activity was revealed by 1H NMR spectroscopy that monitored the appearance of the well resolved signal of the acetate product. Furthermore, the assay was used to probe the subtle structural selectivity of the biocatalyst using a substrate that could adopt different rotameric conformations.
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Affiliation(s)
- Silvia De Cesare
- School of Chemistry, University of Edinburgh, David Brewster Road, King's Buildings, Edinburgh, EH9 3FJ, UK.
| | - Catherine A McKenna
- School of Chemistry, University of Edinburgh, David Brewster Road, King's Buildings, Edinburgh, EH9 3FJ, UK.
| | | | - Lorna Murray
- School of Chemistry, University of Edinburgh, David Brewster Road, King's Buildings, Edinburgh, EH9 3FJ, UK.
| | - Juraj Bella
- School of Chemistry, University of Edinburgh, David Brewster Road, King's Buildings, Edinburgh, EH9 3FJ, UK.
| | - Dominic J Campopiano
- School of Chemistry, University of Edinburgh, David Brewster Road, King's Buildings, Edinburgh, EH9 3FJ, UK.
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Meier S. Mechanism and malleability of glucose dehydration to HMF: entry points and water-induced diversions. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02567g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A water-enabled reaction to a polyester building block is found to widely occur in the conversion of glucose to HMF.
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Affiliation(s)
- Sebastian Meier
- Department of Chemistry
- Technical University of Denmark
- 2800 Kgs Lyngby
- Denmark
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