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Aslam AS, Muhammad LM, Erbs Hillers-Bendtsen A, Mikkelsen KV, Moth-Poulsen K. Norbornadiene-Quadricyclane Photoswitches with Enhanced Solar Spectrum Match. Chemistry 2024; 30:e202401430. [PMID: 38825835 DOI: 10.1002/chem.202401430] [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: 04/13/2024] [Revised: 05/23/2024] [Accepted: 06/01/2024] [Indexed: 06/04/2024]
Abstract
Herein, we report monomeric and dimeric norbornadiene-quadricyclane molecular photoswitch systems intended for molecular solar thermal applications. A series of six new norbornadiene derivatives conjugated with benzothiadiazole as the acceptor unit and dithiafulvene as the donor unit were synthesized and fully characterized. The photoswitches were evaluated by experimentally and theoretically measuring optical absorption profiles and thermal conversion of quadricyclane to norbornadiene. Computational insight by density functional theory calculations at the M06-2X/def2-SVPD level of theory provided geometries, storage energies, UV-vis absorption spectra, and HOMO-LUMO levels that are used to describe the function of the molecular systems. The studied molecules exhibit absorption onset ranging from 416 nm to 595 nm due to a systemic change in their donor-acceptor character. This approach was advantageous due to the introduction of benzothiadiazole and the dimeric nature of molecular structures. The best-performing system has a half-life of 3 days with quantum yields over 50 %.
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Affiliation(s)
- Adil S Aslam
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-41296, Gothenburg, Sweden
| | - Lidiya M Muhammad
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-41296, Gothenburg, Sweden
| | | | - Kurt V Mikkelsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark
| | - Kasper Moth-Poulsen
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-41296, Gothenburg, Sweden
- Department of Chemical Engineering, Universitat Politècnica de Catalunya, Eduard Maristany 10-14, 08019, Barcelona, Spain
- The Institute of Materials Science of Barcelona, ICMAB-CSIC, Bellaterra, Barcelona, 08193, Spain
- Catalan Institution for Research & Advanced Studies, ICREA, Pg. Llu'ıs Companys 23, Barcelona, Spain
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2
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Hemauer F, Steinrück HP, Papp C. The Norbornadiene/Quadricyclane Pair as Molecular Solar Thermal Energy Storage System: Surface Science Investigations. Chemphyschem 2024; 25:e202300806. [PMID: 38375756 DOI: 10.1002/cphc.202300806] [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: 10/30/2023] [Revised: 02/19/2024] [Accepted: 02/19/2024] [Indexed: 02/21/2024]
Abstract
For the transition to renewable energy sources, novel energy storage materials are more important than ever. This review addresses so-called molecular solar thermal (MOST) systems, which appear very promising since they combine light harvesting and energy storing in one-photon one-molecule processes. The focus is on norbornadiene (NBD), a particularly interesting candidate, which is converted to the strained valence isomer quadricyclane (QC) upon irradiation. The stored energy can be released on demand. The energy-releasing cycloreversion from QC to NBD can be initiated by a thermal, catalytic, or electrochemical trigger. The reversibility of the energy storage and release cycles determines the general practicality of a MOST system. In the search for derivatives, which enable large-scale applications, fundamental surface science studies help to assess the feasibility of potential substituted NBD/QC couples. We include investigations under well-defined ultra-high vacuum (UHV) conditions as well as experiments in liquid phase. Next to the influence of the catalytically active surfaces on the isomerization between the two valence isomers, information on adsorption geometries, thermal stability limits, and reaction pathways of the respective molecules are discussed. Moreover, laboratory-scaled test devices demonstrate the proof of concept in various areas of application.
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Affiliation(s)
- Felix Hemauer
- Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany
- Angewandte Physikalische Chemie, Freie Universität Berlin, Arnimallee 22, 14195, Berlin, Germany
| | - Hans-Peter Steinrück
- Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany
- Erlangen Center for Interface Research and Catalysis (ECRC), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany
| | - Christian Papp
- Angewandte Physikalische Chemie, Freie Universität Berlin, Arnimallee 22, 14195, Berlin, Germany
- Erlangen Center for Interface Research and Catalysis (ECRC), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany
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3
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Coppola F, Nucci M, Marazzi M, Rocca D, Pastore M. Norbornadiene/Quadricyclane System in the Spotlight: The Role of Rydberg States and Dynamic Electronic Correlation in a Solar‐Thermal Building Block. CHEMPHOTOCHEM 2023. [DOI: 10.1002/cptc.202200214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Federico Coppola
- Laboratoire de Physique et Chimie Théoriques (LPCT) Université de Lorraine & CNRS, UMR 7019 54000 Nancy France
| | - Martina Nucci
- Universidad de Alcalá Departamento de Química Analítica Química Física e Ingeniería Química Grupo de Reactividad y Estructura Molecular (RESMOL) Alcalá de Henares Madrid Spain
| | - Marco Marazzi
- Universidad de Alcalá Departamento de Química Analítica Química Física e Ingeniería Química Grupo de Reactividad y Estructura Molecular (RESMOL) Alcalá de Henares Madrid Spain
- Universidad de Alcalá Instituto de Investigación Química ‘‘Andrés M. del Río'' (IQAR) Alcalá de Henares Madrid Spain
| | - Dario Rocca
- Laboratoire de Physique et Chimie Théoriques (LPCT) Université de Lorraine & CNRS, UMR 7019 54000 Nancy France
| | - Mariachiara Pastore
- Laboratoire de Physique et Chimie Théoriques (LPCT) Université de Lorraine & CNRS, UMR 7019 54000 Nancy France
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Kjaersgaard A, Hölzel H, Moth-Poulsen K, Nielsen MB. Photolytic Studies of Norbornadiene Derivatives under High-Intensity Light Conditions. J Phys Chem A 2022; 126:6849-6857. [PMID: 36149432 DOI: 10.1021/acs.jpca.2c03583] [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
The photoconversion of a norbornadiene (NBD) derivative was studied under high-intensity mono- and polychromatic light conditions at high concentrations. The photoisomerization quantum yield (ϕNBD→QC), proceeding from NBD to its quadricyclane (QC) isomer, was determined using a tunable OPO laser and a solar simulator light source. The solar simulator was designed to mimic the AM1.5G solar spectrum between 300 and 900 nm. Using the OPO laser, ϕNBD→QC was measured at discrete values between 310 and 350 nm in steps of 10 nm, and a variation between 0.81 and 0.96 was observed. Weighting these values of ϕNBD→QC with the spectral profile of the solar simulator, an averaged value of 0.87 ± 0.03 was obtained. Determination of ϕNBD→QC was also performed directly in the solar simulator providing a value of 0.97 ± 0.14, in good agreement with the weighted values from the OPO. Photoisomerization quantum yields were found to decrease slightly at higher concentrations. At high concentrations, we found that correcting for the presence of QC was important due to similar absorption coefficients of the NBD and QC isomers at the absorption tail. Cyclability of the forward and backward NBD/QC conversion was studied over several cycles. The NBD/QC couple exhibited excellent thermal stability, but a slight photodegradation per cycle was observed, increasing with the concentration of the sample. This result indicates that the molecules undergo some intermolecular reactions.
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Affiliation(s)
- Alexander Kjaersgaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Helen Hölzel
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg 412 96, Sweden
| | - Kasper Moth-Poulsen
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg 412 96, Sweden.,Catalan Institution for Research and Advanced Studies (ICREA), Pg. Lluís Companys 23, 08010 Barcelona, Spain.,The Institute of Materials Science of Barcelona (ICMAB-CSIC), 08193 Bellaterra, Barcelona, Spain
| | - Mogens Brøndsted Nielsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
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Franz E, Kunz A, Oberhof N, Heindl AH, Bertram M, Fusek L, Taccardi N, Wasserscheid P, Dreuw A, Wegner HA, Brummel O, Libuda J. Electrochemically Triggered Energy Release from an Azothiophene-Based Molecular Solar Thermal System. CHEMSUSCHEM 2022; 15:e202200958. [PMID: 35762102 PMCID: PMC9796447 DOI: 10.1002/cssc.202200958] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 06/23/2022] [Indexed: 05/09/2023]
Abstract
Molecular solar thermal (MOST) systems combine solar energy conversion, storage, and release in simple one-photon one-molecule processes. Here, we address the electrochemically triggered energy release from an azothiophene-based MOST system by photoelectrochemical infrared reflection absorption spectroscopy (PEC-IRRAS) and density functional theory (DFT). Specifically, the electrochemically triggered back-reaction from the energy rich (Z)-3-cyanophenylazothiophene to its energy lean (E)-isomer using highly oriented pyrolytic graphite (HOPG) as the working electrode was studied. Theory predicts that two reaction channels are accessible, an oxidative one (hole-catalyzed) and a reductive one (electron-catalyzed). Experimentally it was found that the photo-isomer decomposes during hole-catalyzed energy release. Electrochemically triggered back-conversion was possible, however, through the electron-catalyzed reaction channel. The reaction rate could be tuned by the electrode potential within two orders of magnitude. It was shown that the MOST system withstands 100 conversion cycles without detectable decomposition of the photoswitch. After 100 cycles, the photochemical conversion was still quantitative and the electrochemically triggered back-reaction reached 94 % of the original conversion level.
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Affiliation(s)
- Evanie Franz
- Interface Research and CatalysisErlangen Center for Interface Research and CatalysisFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 391058ErlangenGermany
| | - Anne Kunz
- Institute of Organic ChemistryJustus-Liebig-UniversitätHeinrich-Buff-Ring 1735392GiessenGermany
| | - Nils Oberhof
- Interdisciplinary Center for Scientific ComputingUniversität HeidelbergIm Neuenheimer Feld 205 A69120HeidelbergGermany
| | - Andreas H. Heindl
- Institute of Organic ChemistryJustus-Liebig-UniversitätHeinrich-Buff-Ring 1735392GiessenGermany
| | - Manon Bertram
- Interface Research and CatalysisErlangen Center for Interface Research and CatalysisFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 391058ErlangenGermany
| | - Lukas Fusek
- Interface Research and CatalysisErlangen Center for Interface Research and CatalysisFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 391058ErlangenGermany
| | - Nicola Taccardi
- Institute of Chemical Reaction EngineeringFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 3D-91058ErlangenGermany
| | - Peter Wasserscheid
- Institute of Chemical Reaction EngineeringFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 3D-91058ErlangenGermany
- Forschungszentrum Jülich GmbHHelmholtz Institute Erlangen-Nürnberg for Renewable EnergyEgerlandstraße 3D-91058ErlangenGermany
| | - Andreas Dreuw
- Interdisciplinary Center for Scientific ComputingUniversität HeidelbergIm Neuenheimer Feld 205 A69120HeidelbergGermany
| | - Hermann A. Wegner
- Institute of Organic ChemistryJustus-Liebig-UniversitätHeinrich-Buff-Ring 1735392GiessenGermany
| | - Olaf Brummel
- Interface Research and CatalysisErlangen Center for Interface Research and CatalysisFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 391058ErlangenGermany
| | - Jörg Libuda
- Interface Research and CatalysisErlangen Center for Interface Research and CatalysisFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 391058ErlangenGermany
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Quant M, Hillers-Bendtsen AE, Ghasemi S, Erdelyi M, Wang Z, Muhammad LM, Kann N, Mikkelsen KV, Moth-Poulsen K. Synthesis, characterization and computational evaluation of bicyclooctadienes towards molecular solar thermal energy storage. Chem Sci 2022; 13:834-841. [PMID: 35173948 PMCID: PMC8768882 DOI: 10.1039/d1sc05791j] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 12/20/2021] [Indexed: 01/17/2023] Open
Abstract
Molecular solar-thermal energy storage (MOST) systems are based on photoswitches that reversibly convert solar energy into chemical energy. In this context, bicyclooctadienes (BODs) undergo a photoinduced transformation to the corresponding higher energy tetracyclooctanes (TCOs), but the photoswitch system has not until now been evaluated for MOST application, due to the short half-life of the TCO form and limited available synthetic methods. The BOD system degrades at higher temperature via a retro-Diels-Alder reaction, which complicates the synthesis of the compounds. We here report a cross-coupling reaction strategy that enables an efficient synthesis of a series of 4 new BOD compounds. We show that the BODs were able to switch to the corresponding tetracyclooctanes (TCOs) in a reversible way and can be cycled 645 times with only 0.01% degradation. Half-lives of the TCOs were measured, and we illustrate how the half-life could be engineered from seconds to minutes by molecular structure design. A density functional theory (DFT) based modelling framework was developed to access absorption spectra, thermal half-lives, and storage energies which were calculated to be 143-153 kJ mol-1 (0.47-0.51 MJ kg-1), up to 76% higher than for the corresponding norbornadiene. The combined computational and experimental findings provide a reliable way of designing future BOD/TCO systems with tailored properties.
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Affiliation(s)
- Maria Quant
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
| | | | - Shima Ghasemi
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
| | - Mate Erdelyi
- Department of Chemistry - BMC, Uppsala University Husargatan 3 752 37 Uppsala Sweden
| | - Zhihang Wang
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
| | - Lidiya M Muhammad
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
| | - Nina Kann
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
| | - Kurt V Mikkelsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5 2100 Copenhagen Denmark
| | - Kasper Moth-Poulsen
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
- The Institute of Materials Science of Barcelona, ICMAB-CSIC 08193, Bellaterra Barcelona Spain
- Catalan Institution for Research & Advanced Studies, ICREA Pg. Lluís Companys 23 Barcelona Spain
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7
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Volarić J, Szymanski W, Simeth NA, Feringa BL. Molecular photoswitches in aqueous environments. Chem Soc Rev 2021; 50:12377-12449. [PMID: 34590636 PMCID: PMC8591629 DOI: 10.1039/d0cs00547a] [Citation(s) in RCA: 132] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Indexed: 12/17/2022]
Abstract
Molecular photoswitches enable dynamic control of processes with high spatiotemporal precision, using light as external stimulus, and hence are ideal tools for different research areas spanning from chemical biology to smart materials. Photoswitches are typically organic molecules that feature extended aromatic systems to make them responsive to (visible) light. However, this renders them inherently lipophilic, while water-solubility is of crucial importance to apply photoswitchable organic molecules in biological systems, like in the rapidly emerging field of photopharmacology. Several strategies for solubilizing organic molecules in water are known, but there are not yet clear rules for applying them to photoswitchable molecules. Importantly, rendering photoswitches water-soluble has a serious impact on both their photophysical and biological properties, which must be taken into consideration when designing new systems. Altogether, these aspects pose considerable challenges for successfully applying molecular photoswitches in aqueous systems, and in particular in biologically relevant media. In this review, we focus on fully water-soluble photoswitches, such as those used in biological environments, in both in vitro and in vivo studies. We discuss the design principles and prospects for water-soluble photoswitches to inspire and enable their future applications.
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Affiliation(s)
- Jana Volarić
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
| | - Wiktor Szymanski
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
- Department of Radiology, Medical Imaging Center, University of Groningen, University Medical Centre Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Nadja A Simeth
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
- Institute for Organic and Biomolecular Chemistry, University of Göttingen, Tammannstr. 2, 37077 Göttingen, Germany
| | - Ben L Feringa
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
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Orrego‐Hernández J, Hölzel H, Quant M, Wang Z, Moth‐Poulsen K. Scalable Synthesis of Norbornadienes via
in situ
Cracking of Dicyclopentadiene Using Continuous Flow Chemistry. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100795] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Jessica Orrego‐Hernández
- Department of Chemistry and Chemical Engineering Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
| | - Helen Hölzel
- Department of Chemistry and Chemical Engineering Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
| | - Maria Quant
- Department of Chemistry and Chemical Engineering Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
| | - Zhihang Wang
- Department of Chemistry and Chemical Engineering Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
| | - Kasper Moth‐Poulsen
- Department of Chemistry and Chemical Engineering Chalmers University of Technology Kemigården 4 412 96 Gothenburg Sweden
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9
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Bertram M, Waidhas F, Jevric M, Fromm L, Schuschke C, Kastenmeier M, Görling A, Moth-Poulsen K, Brummel O, Libuda J. Norbornadiene photoswitches anchored to well-defined oxide surfaces: From ultrahigh vacuum into the liquid and the electrochemical environment. J Chem Phys 2020; 152:044708. [PMID: 32007072 DOI: 10.1063/1.5137897] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Employing molecular photoswitches, we can combine solar energy conversion, storage, and release in an extremely simple single molecule system. In order to release the stored energy as electricity, the photoswitch has to interact with a semiconducting electrode surface. In this work, we explore a solar-energy-storing model system, consisting of a molecular photoswitch anchored to an atomically defined oxide surface in a liquid electrolyte and under potential control. Previously, this model system has been proven to be operational under ultrahigh vacuum (UHV) conditions. We used the tailor-made norbornadiene derivative 2-cyano-3-(4-carboxyphenyl)norbornadiene (CNBD) and characterized its photochemical and electrochemical properties in an organic electrolyte. Next, we assembled a monolayer of CNBD on a well-ordered Co3O4(111) surface by physical vapor deposition in UHV. This model interface was then transferred into the liquid electrolyte and investigated by photoelectrochemical infrared reflection absorption spectroscopy experiments. We demonstrate that the anchored monolayer of CNBD can be converted photochemically to its energy-rich counterpart 2-cyano-3-(4-carboxyphenyl)quadricyclane (CQC) under potential control. However, the reconversion potential of anchored CQC overlaps with the oxidation and decomposition potential of CNBD, which limits the electrochemically triggered reconversion.
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Affiliation(s)
- Manon Bertram
- Interface Research and Catalysis, Erlangen Catalysis Resource Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Fabian Waidhas
- Interface Research and Catalysis, Erlangen Catalysis Resource Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Martyn Jevric
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - Lukas Fromm
- Lehrstuhl für Theoretische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Christian Schuschke
- Interface Research and Catalysis, Erlangen Catalysis Resource Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Maximilian Kastenmeier
- Interface Research and Catalysis, Erlangen Catalysis Resource Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Andreas Görling
- Lehrstuhl für Theoretische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Kasper Moth-Poulsen
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - Olaf Brummel
- Interface Research and Catalysis, Erlangen Catalysis Resource Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Jörg Libuda
- Interface Research and Catalysis, Erlangen Catalysis Resource Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
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