1
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Pehlken C, Pfeffer MG, Reich K, Rau S. Evaluation of 1 H-NMR Spectroscopy-Based Quantification Methods of the Supramolecular Aggregation of a Molecular Photosensitizer. Photochem Photobiol 2022; 98:1255-1263. [PMID: 35737849 DOI: 10.1111/php.13669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 06/15/2022] [Indexed: 12/01/2022]
Abstract
The supramolecular dimerization of a ruthenium polypyridyl precursor of a well-developed family of hydrogen evolving photocatalysts via π-π-interactions of the polyheteroaromatic bridging ligand was quantified with concentration dependent 1 H-NMR-spectroscopy. The data sets were analyzed with different calculation and fit methods. A comparison between the results of direct calculation, linear and nonlinear approaches showed that the application of a global nonlinear fit procedure yields the best results. The presented methods are also applicable for dimerization processes in solution of other molecular moieties.
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Affiliation(s)
- Christian Pehlken
- University of Ulm, Institute of Inorganic Chemistry I Materials and Catalysis, Albert-Einstein-Allee 11, 89081, Ulm
| | - Michael G Pfeffer
- University of Ulm, Institute of Inorganic Chemistry I Materials and Catalysis, Albert-Einstein-Allee 11, 89081, Ulm
| | - Katharina Reich
- University of Ulm, Institute of Inorganic Chemistry I Materials and Catalysis, Albert-Einstein-Allee 11, 89081, Ulm
| | - Sven Rau
- University of Ulm, Institute of Inorganic Chemistry I Materials and Catalysis, Albert-Einstein-Allee 11, 89081, Ulm
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2
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Controlling the length of porphyrin supramolecular polymers via coupled equilibria and dilution-induced supramolecular polymerization. Nat Commun 2022; 13:248. [PMID: 35017511 PMCID: PMC8752679 DOI: 10.1038/s41467-021-27831-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 12/07/2021] [Indexed: 12/29/2022] Open
Abstract
Multi-component systems often display convoluted behavior, pathway complexity and coupled equilibria. In recent years, several ways to control complex systems by manipulating the subtle balances of interaction energies between the individual components have been explored and thereby shifting the equilibrium between different aggregate states. Here we show the enantioselective chain-capping and dilution-induced supramolecular polymerization with a Zn2+-porphyrin-based supramolecular system when going from long, highly cooperative supramolecular polymers to short, disordered aggregates by adding a monotopic Mn3+-porphyrin monomer. When mixing the zinc and manganese centered monomers, the Mn3+-porphyrins act as chain-cappers for Zn2+-porphyrin supramolecular polymers, effectively hindering growth of the copolymer and reducing the length. Upon dilution, the interaction between chain-capper and monomers weakens as the equilibria shift and long supramolecular polymers form again. This dynamic modulation of aggregate morphology and length is achieved through enantioselectivity in the aggregation pathways and concentration-sensitive equilibria. All-atom and coarse-grained molecular simulations provide further insights into the mixing of the species and their exchange dynamics. Our combined experimental and theoretical approach allows for precise control of molecular self-assembly and chiral discrimination in complex systems.
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3
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Raynal M, Li Y, Troufflard C, Przybylski C, Gontard G, Maistriaux T, Idé J, Lazzaroni R, Bouteiller L, Brocorens P. Experimental and computational diagnosis of the fluxional nature of a benzene-1,3,5-tricarboxamide-based hydrogen-bonded dimer. Phys Chem Chem Phys 2021; 23:5207-5221. [PMID: 33625418 DOI: 10.1039/d0cp06128j] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Precise characterization of the hydrogen bond network present in discrete self-assemblies of benzene-1,3,5-tricarboxamide monomers derived from amino-esters (ester BTAs) is crucial for the construction of elaborated functional co-assemblies. For all ester BTA dimeric structures previously reported, ester carbonyls in the side chain acted as hydrogen bond acceptors, yielding well-defined dimers stabilized by six hydrogen bonds. The ester BTA monomer derived from glycine (BTA Gly) shows a markedly different self-assembly behaviour. We report herein a combined experimental and computational investigation aimed at determining the nature of the dimeric species formed by BTA Gly. Two distinct dimeric structures were characterized by single-crystal X-ray diffraction measurements. Likewise, a range of spectroscopic and scattering techniques as well as molecular modelling were employed to diagnose the nature of dynamic dimeric structures in toluene. Our results unambiguously establish that both ester and amide carbonyls are involved in the hydrogen bond network of the discrete dimeric species formed by BTA Gly. The participation of roughly 4.5 ester carbonyls and 1.5 amide carbonyls per dimer as determined by FT-IR spectroscopy implies that several conformations coexist in solution. Moreover, NMR analysis and modelling data reveal rapid interconversion between these different conformers leading to a symmetric structure on the NMR timescale. Rapid hydrogen bond shuffling between conformers having three (three), two (four), one (five) and zero (six) amide carbonyl groups (ester carbonyl groups, respectively) as hydrogen bond acceptors is proposed to explain the magnetic equivalence of the amide N-H on the NMR timescale. When compared to other ester BTA derivatives in which only ester carbonyls act as hydrogen bond acceptors, the fluxional behaviour of the hydrogen-bonded dimers of BTA Gly likely originates from a larger range of energetically favorable conformations accessible through rotation of the BTA side chains.
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Affiliation(s)
- M Raynal
- Sorbonne Université, CNRS, IPCM, UMR 8232, 4 Place Jussieu, 75252 Paris Cedex 05, France.
| | - Y Li
- Sorbonne Université, CNRS, IPCM, UMR 8232, 4 Place Jussieu, 75252 Paris Cedex 05, France.
| | - C Troufflard
- Sorbonne Université, CNRS, IPCM, UMR 8232, 4 Place Jussieu, 75252 Paris Cedex 05, France.
| | - C Przybylski
- Sorbonne Université, CNRS, IPCM, UMR 8232, 4 Place Jussieu, 75252 Paris Cedex 05, France.
| | - G Gontard
- Sorbonne Université, CNRS, IPCM, UMR 8232, 4 Place Jussieu, 75252 Paris Cedex 05, France.
| | - T Maistriaux
- Service de Chimie des Matériaux Nouveaux, Institut de Recherche sur les Matériaux, Université de Mons, Place du Parc, 20, B-7000, Mons, Belgium.
| | - J Idé
- Service de Chimie des Matériaux Nouveaux, Institut de Recherche sur les Matériaux, Université de Mons, Place du Parc, 20, B-7000, Mons, Belgium.
| | - R Lazzaroni
- Service de Chimie des Matériaux Nouveaux, Institut de Recherche sur les Matériaux, Université de Mons, Place du Parc, 20, B-7000, Mons, Belgium.
| | - L Bouteiller
- Sorbonne Université, CNRS, IPCM, UMR 8232, 4 Place Jussieu, 75252 Paris Cedex 05, France.
| | - P Brocorens
- Service de Chimie des Matériaux Nouveaux, Institut de Recherche sur les Matériaux, Université de Mons, Place du Parc, 20, B-7000, Mons, Belgium.
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4
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Habets T, Speller S, Elemans JAAW. Role of redox-active axial ligands of metal porphyrins adsorbed at solid-liquid interfaces in a liquid-STM setup. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2020; 11:1264-1271. [PMID: 32953370 PMCID: PMC7476586 DOI: 10.3762/bjnano.11.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 07/30/2020] [Indexed: 06/11/2023]
Abstract
In a liquid-STM setup environment, the redox behavior of manganese porphyrins was studied at various solid-liquid interfaces. In the presence of a solution of Mn(III)Cl porphyrins in 1-phenyloctane, which was placed at a conductive surface, large and constant additional currents relative to a set tunneling current were observed, which varied with the magnitude of the applied bias voltage. These currents occurred regardless of the type of surface (HOPG or Au(111)) or tip material (PtIr, Au or W). The additional currents were ascribed to the occurrence of redox reactions in which chloride is oxidized to chlorine and the Mn(III) center of the porphyrin moiety is reduced to Mn(II). The resulting Mn(II) porphyrin products were identified by UV-vis analysis of the liquid phase. For solutions of Mn(III) porphyrins with non-redox active acetate instead of chloride axial ligands, the currents remained absent.
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Affiliation(s)
- Thomas Habets
- Radboud University, Institute for Molecules and Materials (IMM), 6525 AJ Nijmegen, Netherlands
| | - Sylvia Speller
- University of Rostock, Institute of Physics, Albert-Einstein-Straße 23, 18059 Rostock, Germany
- University of Rostock, Department Life, Light, Matter, Albert-Einstein-Straße 25, 18059 Rostock, Germany
| | - Johannes A A W Elemans
- Radboud University, Institute for Molecules and Materials (IMM), 6525 AJ Nijmegen, Netherlands
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5
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Ahadi E, Hosseini-Monfared H, Spieß A, Janiak C. Photocatalytic asymmetric epoxidation of trans-stilbene with manganese–porphyrin/graphene-oxide nanocomposite and molecular oxygen: axial ligand effect. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00441c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
An efficient, visible light-driven manganese–porphyrin photocatalyst was developed for the asymmetric epoxidation of trans-stilbene by molecular oxygen under mild conditions.
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Affiliation(s)
- Elahe Ahadi
- Department of Chemistry
- University of Zanjan
- Zanjan
- Iran
| | | | - Alex Spieß
- Institut für Anorganische Chemie und Strukturchemie
- Heinrich-Heine-Universität Düsseldorf
- 40204 Düsseldorf
- Germany
| | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie
- Heinrich-Heine-Universität Düsseldorf
- 40204 Düsseldorf
- Germany
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6
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Yang G, Lin C, Feng X, Wang T, Jiang J. Multi-component supramolecular gels induce protonation of a porphyrin exciplex to achieve improved collective optical properties for effective photocatalytic hydrogen generation. Chem Commun (Camb) 2020; 56:527-530. [DOI: 10.1039/c9cc08060k] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Two-porphyrin supramolecular gels induce exciplex formation, protonation and J-aggregation of porphyrins, which render a smaller bandgap, charge separation and good photocatalytic properties.
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Affiliation(s)
- Gengxiang Yang
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials
- Department of Chemistry
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Chenxiang Lin
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials
- Department of Chemistry
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Xuenan Feng
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials
- Department of Chemistry
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Tianyu Wang
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials
- Department of Chemistry
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Jianzhuang Jiang
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials
- Department of Chemistry
- University of Science and Technology Beijing
- Beijing 100083
- China
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7
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Aerobic Epoxidation of Low-Molecular-Weight and Polymeric Olefins by a Supramolecular Manganese Porphyrin Catalyst. Catalysts 2019. [DOI: 10.3390/catal9020195] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
We report on the highly efficient epoxidation of low-molecular-weight and polymeric olefins catalyzed by a supramolecular manganese porphyrin complex using molecular oxygen as an oxidant and an aldehyde as a co-reductant. At ambient temperature and under optimized reaction conditions, the catalyst showed high activity and stereoselectivity. The efficiency of the supramolecular manganese porphyrin was higher than that of a reference porphyrin catalyst, possibly because it was more stable under the applied reaction conditions. Mechanistic studies suggest that a manganese oxo porphyrin complex may be an intermediate in the epoxidation reaction.
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8
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Desmarchelier A, Alvarenga BG, Caumes X, Dubreucq L, Troufflard C, Tessier M, Vanthuyne N, Idé J, Maistriaux T, Beljonne D, Brocorens P, Lazzaroni R, Raynal M, Bouteiller L. Tuning the nature and stability of self-assemblies formed by ester benzene 1,3,5-tricarboxamides: the crucial role played by the substituents. SOFT MATTER 2016; 12:7824-7838. [PMID: 27722677 DOI: 10.1039/c6sm01601d] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
As the benzene 1,3,5-tricarboxamide (BTA) moiety is commonly used as the central assembling unit for the construction of functionalized supramolecular architectures, strategies to tailor the nature and stability of BTA assemblies are needed. The assembly properties of a library of structurally simple BTAs derived from amino dodecyl esters (ester BTAs, 13 members) have been studied, either in the bulk or in cyclohexane solutions, by means of a series of analytical methods (NMR, DSC, POM, FT-IR, UV-Vis, CD, ITC, high-sensitivity DSC, SANS). Two types of hydrogen-bonded species have been identified and characterized: the expected amide-bonded helical rods (or stacks) that are structurally similar to those formed by BTAs with simple alkyl side chains (alkyl BTAs), and ester-bonded dimers in which the BTAs are connected by means of hydrogen bonds linking the amide N-H and the ester C[double bond, length as m-dash]O. MM/MD calculations coupled with simulations of CD spectra allow for the precise determination of the molecular arrangement and of the hydrogen bond pattern of these dimers. Our study points out the crucial influence of the substituent attached on the amino-ester α-carbon on the relative stability of the rod-like versus dimeric assemblies. By varying this substituent, one can precisely tune the nature of the dominant hydrogen-bonded species (stacks or dimers) in the neat compounds and in cyclohexane over a wide range of temperatures and concentrations. In the neat BTAs, stacks are stable up to 213 °C and dimers above 180 °C whilst in cyclohexane stacks form at c* > 3 × 10-5 M at 20 °C and dimers are stable up to 80 °C at 7 × 10-6 M. Ester BTAs that assemble into stacks form a liquid-crystalline phase and yield gels or viscous solutions in cyclohexane, demonstrating the importance of controlling the structure of these assemblies. Our systematic study of these structurally similar ester BTAs also allows for a better understanding of how a single atom or moiety can impact the nature and stability of BTA aggregates, which is of importance for the future development of functionalized BTA supramolecular polymers.
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Affiliation(s)
- Alaric Desmarchelier
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymeres, 4 Place Jussieu, F-75005 Paris, France.
| | - Bruno Giordano Alvarenga
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymeres, 4 Place Jussieu, F-75005 Paris, France. and Department of Physical-Chemistry, Institute of Chemistry, University of Campinas, Brazil
| | - Xavier Caumes
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymeres, 4 Place Jussieu, F-75005 Paris, France.
| | - Ludovic Dubreucq
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymeres, 4 Place Jussieu, F-75005 Paris, France.
| | - Claire Troufflard
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymeres, 4 Place Jussieu, F-75005 Paris, France.
| | - Martine Tessier
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymeres, 4 Place Jussieu, F-75005 Paris, France.
| | - Nicolas Vanthuyne
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2, UMR 7313, 13397 Marseille Cedex 20, France
| | - Julien Idé
- Service de Chimie des Matériaux Nouveaux, Université de Mons/Materia Nova, Place du Parc, 20, B-7000 Mons, Belgium
| | - Thomas Maistriaux
- Service de Chimie des Matériaux Nouveaux, Université de Mons/Materia Nova, Place du Parc, 20, B-7000 Mons, Belgium
| | - David Beljonne
- Service de Chimie des Matériaux Nouveaux, Université de Mons/Materia Nova, Place du Parc, 20, B-7000 Mons, Belgium
| | - Patrick Brocorens
- Service de Chimie des Matériaux Nouveaux, Université de Mons/Materia Nova, Place du Parc, 20, B-7000 Mons, Belgium
| | - Roberto Lazzaroni
- Service de Chimie des Matériaux Nouveaux, Université de Mons/Materia Nova, Place du Parc, 20, B-7000 Mons, Belgium
| | - Matthieu Raynal
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymeres, 4 Place Jussieu, F-75005 Paris, France.
| | - Laurent Bouteiller
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymeres, 4 Place Jussieu, F-75005 Paris, France.
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9
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Desmarchelier A, Caumes X, Raynal M, Vidal-Ferran A, van Leeuwen PWNM, Bouteiller L. Correlation between the Selectivity and the Structure of an Asymmetric Catalyst Built on a Chirally Amplified Supramolecular Helical Scaffold. J Am Chem Soc 2016; 138:4908-16. [PMID: 26998637 DOI: 10.1021/jacs.6b01306] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
For the first time, supramolecular helical rods composed of an achiral metal complex and a complementary enantiopure monomer provided a good level of enantioinduction in asymmetric catalysis. Mixtures containing an achiral ligand monomer (BTA(PPh2), 2 mol %) and an enantiopure ligand-free comonomer (ester BTA, 2.5 mol %), both possessing a complementary benzene-1,3,5-tricarboxamide (BTA) central unit, were investigated in combination with [Rh(cod)2]BArF (1 mol %) in the asymmetric hydrogenation of dimethyl itaconate. Notably, efficient chirality transfer occurs within the hydrogen-bonded coassemblies formed by BTA Ile and the intrinsically achiral catalytic rhodium catalyst, providing the hydrogenation product with up to 85% ee. The effect of the relative content of BTA Ile as compared to the ligand was investigated. The amount of chiral comonomer can be decreased down to one-fourth of that of the ligand without deteriorating the enantioselectivity of the reaction, while the enantioselectivity decreases for mixtures containing high amounts of BTA Ile. The nonlinear relationship between the amount of chiral comonomer and the enantioselectivity indicates that chirality amplification effects are at work in this catalytic system. Also, right-handed helical rods are formed upon co-assembly of the achiral rhodium complex of BTA(PPh2) and the enantiopure comonomer BTA Ile as confirmed by various spectroscopic and scattering techniques. Remarkably, the major enantiomer and the selectivity of the catalytic reaction are related to the handedness and the net helicity of the coassemblies, respectively. Further development of this class of catalysts built on chirally amplified helical scaffolds should contribute to the design of asymmetric catalysts operating with low amounts of chiral entities.
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Affiliation(s)
- Alaric Desmarchelier
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères , 4 Place Jussieu, F-75005 Paris, France
| | - Xavier Caumes
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères , 4 Place Jussieu, F-75005 Paris, France
| | - Matthieu Raynal
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères , 4 Place Jussieu, F-75005 Paris, France
| | - Anton Vidal-Ferran
- Institute of Chemical Research of Catalonia (ICIQ) , Avgda. Països Catalans 16, 43007 Tarragona, Spain.,Catalan Institution for Research and Advanced Studies (ICREA) , Passeig Lluís Companys 23, 08010 Barcelona, Spain
| | | | - Laurent Bouteiller
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères , 4 Place Jussieu, F-75005 Paris, France
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10
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Mojarrad AG, Zakavi S. A novel porphyrinic photosensitizer based on the molecular complex of meso-tetraphenylporphyrin with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone: higher photocatalytic activity, photooxidative stability and solubility in non-chlorinated solvents. RSC Adv 2016. [DOI: 10.1039/c6ra21575k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The 1 : 2 molecular complex ofmeso-tetraphenylporphyrin with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) has been used as a promising photosensitizer for the aerobic oxidation of olefins in different chlorinated and non-chlorinated solvents.
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Affiliation(s)
- Aida G. Mojarrad
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan 45137-66731
- Iran
| | - Saeed Zakavi
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan 45137-66731
- Iran
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11
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Dirany M, Ayzac V, Isare B, Raynal M, Bouteiller L. Structural Control of Bisurea-Based Supramolecular Polymers: Influence of an Ester Moiety. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11443-11451. [PMID: 26461519 DOI: 10.1021/acs.langmuir.5b02974] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A few examples of monomers are known that self-assemble into various high molar mass structures in solution. Controlling the morphology of the resulting supramolecular polymers is a highly desirable goal for many applications. Herein, we compare the self-assembling properties of newly prepared ester bisurea monomers with those of previously investigated alkyl bisurea monomers. The ester functionality decreases the hydrogen bonding strength of the bisurea monomers but does not prevent the formation of long assemblies in nonpolar solvents: gels are formed at millimolar concentration. Surprisingly, ester bisureas self-assemble at room temperature into rod-like urea-bonded supramolecular polymers that are different from the ones formed by alkyl bisureas. The rods formed by ester bisurea supramolecular polymers are compact (instead of tubular in the case of alkyl bisureas) and display two monomers in the cross-section (instead of three in the case of alkyl bisureas). The stability of the structures formed by ester bisureas can be easily tuned by changing the nature of the substituent in the α-position of the urea functions and/or the nature of the alkyl side chains.
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Affiliation(s)
- Mohammed Dirany
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères, 4 Place Jussieu, F-75005 Paris, France
| | - Virgile Ayzac
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères, 4 Place Jussieu, F-75005 Paris, France
| | - Benjamin Isare
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères, 4 Place Jussieu, F-75005 Paris, France
| | - Matthieu Raynal
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères, 4 Place Jussieu, F-75005 Paris, France
| | - Laurent Bouteiller
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères, 4 Place Jussieu, F-75005 Paris, France
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12
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Neu HM, Jung J, Baglia RA, Siegler MA, Ohkubo K, Fukuzumi S, Goldberg DP. Light-driven, proton-controlled, catalytic aerobic C-H oxidation mediated by a Mn(III) porphyrinoid complex. J Am Chem Soc 2015; 137:4614-7. [PMID: 25839905 DOI: 10.1021/jacs.5b00816] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The visible light-driven, catalytic aerobic oxidation of benzylic C-H bonds was mediated by a Mn(III) corrolazine complex. To achieve catalytic turnovers, a strict selective requirement for the addition of protons was established. The resting state of the catalyst was unambiguously characterized by X-ray diffraction as [Mn(III)(H2O)(TBP8Cz(H))](+), in which a single, remote site on the ligand is protonated. If two remote sites are protonated, however, reactivity with O2 is shut down. Spectroscopic methods revealed that the related Mn(V)(O) complex is also protonated at the same remote site at -60 °C, but undergoes valence tautomerization upon warming.
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Affiliation(s)
- Heather M Neu
- †Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Jieun Jung
- ‡Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan
| | - Regina A Baglia
- †Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Maxime A Siegler
- †Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Kei Ohkubo
- ‡Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan
| | - Shunichi Fukuzumi
- ‡Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan.,§Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea
| | - David P Goldberg
- †Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
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13
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Presolski SI, van der Weegen R, Wiesfeld JJ, Meijer EW. Efficient Routes to A3B-Type meso-(4-Carboxyphenyl) Porphyrin Derivatives. Org Lett 2014; 16:1864-7. [DOI: 10.1021/ol500182z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Stanislav I. Presolski
- Institute
for Complex Molecular
Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Rob van der Weegen
- Institute
for Complex Molecular
Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Jan J. Wiesfeld
- Institute
for Complex Molecular
Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - E. W. Meijer
- Institute
for Complex Molecular
Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
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Zaharia M, Borhan A, Gherca D, Pui A, Gradinaru R, Zbancioc G, Drochioiu G. Study on the mechanism of ferrite-induced dinitrophenol photodegradation. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2014; 20:193-197. [PMID: 24895780 DOI: 10.1255/ejms.1267] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report here the effectiveness of gas chromatography mass spectrometry techniques in establishing the ferrite-associated photocatalytic degradation mechanism of pesticide 2,4-dinitrophenol (2,6-DNP). Unlike the previously discussed DNP-degradation mechanisms that involve either oxidation or reduction reactions, ferrite-based ultraviolet (UV) photodegradation of DNP affords the nontoxic 6-hydroxy-3,5-dinitrohexa-2,4-dienal by an unusual water addition to the benzene core. We searched for and demonstrated the presence of an epoxide of DNP within the photodegradation process, which may unambiguously explain the novel photochemical mechanism. During the 15 min UV photoinduced process, DNP degradation efficiency on the zinc ferrite catalyst was calculated to be 82%, whereas the first-order kinetic rate constant k was as high as 3.4 x 10(-2)min(-1).
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