1
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Wega J, Zhang KF, Lacour J, Vauthey E. Controlling Symmetry-Breaking Charge Separation in Pyrene Bichromophores. J Phys Chem Lett 2024:2834-2840. [PMID: 38442038 DOI: 10.1021/acs.jpclett.4c00337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
So far, symmetry-breaking charge separation (SB-CS) has been observed with a limited number of chromophores and is usually inhibited by the formation of an excimer. , We show here that thanks to of fine-tuning of the interchromophore coupling via structural control, SB-CS can be operative with pyrene, despite its high propensity to form an excimer. This is realized with a bichromophoric system consisting of two pyrenes attached to a crown ether macrocycle, which can bind cations of different sizes. By combining stationary and time-resolved spectroscopy together with molecular dynamics simulations, we demonstrate that the excited-state dynamics can be totally changed depending on the binding cation. Whereas strong coupling leads to rapid excimer formation, too weak coupling results in noninteracting chromophores. However, intermediate coupling, achieved upon binding of Mg2+, allows for SB-CS to be operative.
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2
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Pál D, Lacour J. Pfeiffer effect on configurationally labile dyes within ternary complexes with metal ions and enantiopure macrocycles. Dalton Trans 2024; 53:2665-2669. [PMID: 38224291 PMCID: PMC10845008 DOI: 10.1039/d3dt04098d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 01/10/2024] [Indexed: 01/16/2024]
Abstract
A configurationally-labile helical dye, 2,4,5,7-tetranitrofluorenone oximate, is used to probe complexes made of enantiopure macrocycles and mono/divalent metal ions. Induced electronic circular dichroism (ECD) and 1H NMR responses are amplified at room temperature only in the presence of K+ and Na+ ions despite larger binding efficiency with alkaline earth metal ions.
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Affiliation(s)
- Dávid Pál
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, CH-1211 Geneva, Switzerland.
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, CH-1211 Geneva, Switzerland.
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3
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Homberg A, Navazio F, Le Tellier A, Zinna F, Fürstenberg A, Besnard C, Di Bari L, Lacour J. Circularly polarized luminescence from Tb(III) interacting with chiral polyether macrocycles. Dalton Trans 2022; 51:16479-16485. [PMID: 36218085 PMCID: PMC9641584 DOI: 10.1039/d2dt02627a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 10/04/2022] [Indexed: 10/14/2023]
Abstract
A straightforward two-step synthesis protocol affords a series of chiral amide-based bis-pyridine substituted polyether macrocycles. One ligand is particularly able to complex terbium(III) ions spontaneously. Upon complexation, interesting chiroptical properties are observed both in absorbance (ECD) and in fluorescence (CPL). In ligand-centered electronic circular dichroism, a sign inversion coupled with a signal enhancement is measured; while an easily detectable metal-centered circularly polarized luminescence with a glum of 0.05 is obtained for the main 5D4 → 7F5 terbium transition. The coordination mode and structure of the complex was studied using different analysis methods (NMR analysis, spectrophotometric titration and solid-state elucidation).
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Affiliation(s)
- Alexandre Homberg
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
| | - Federica Navazio
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
- School of Science and Technology, Chemistry Division, University of Camerino, via S. Agostino n. 1, 62032 Camerino, Italy
| | - Antoine Le Tellier
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
| | - Francesco Zinna
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, 56124 Pisa, Italy
| | - Alexandre Fürstenberg
- Department of Inorganic and Analytical Chemistry, University of Geneva, 1211 Geneva, Switzerland
- Department of Physical Chemistry, University of Geneva, 1211 Geneva, Switzerland
| | - Céline Besnard
- Laboratory of Crystallography, University of Geneva, Quai Ernest Ansermet 24, 1211 Geneva 4, Switzerland
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, 56124 Pisa, Italy
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
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4
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Baghdasaryan A, Brun E, Wang Y, Salassa G, Lacour J, Bürgi T. Combined spectroscopic studies on post-functionalized Au 25 cluster as an ATR-FTIR sensor for cations. Chem Sci 2021; 12:7419-7427. [PMID: 34163832 PMCID: PMC8171333 DOI: 10.1039/d1sc01654g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 04/20/2021] [Indexed: 11/21/2022] Open
Abstract
Recently, significant research activity has been devoted to thiolate-protected gold clusters due to their attractive optical and electronic properties. These properties as well as solubility and stability can be controlled by post-synthetic modification strategies. Herein, the ligand exchange reaction between Au25(2-PET)18 cluster (where 2-PET is 2-phenylethanethiol) and di-thiolated crown ether (t-CE) ligands bearing two chromophores was studied. The post-functionalization aimed to endow the cluster with ion binding properties. The exchange reaction was followed in situ by UV-vis, 1H NMR and HPLC. MALDI mass analysis revealed the incorporation of up to 5 t-CE ligands into the ligand shell. Once functionalized MALDI furthermore showed complexation of sodium ions to the cluster. ATR-FTIR spectroscopic studies using aqueous solutions of K+, Ba2+, Gd3+ and Eu3+ showed noticeable spectral shifts of the C-O stretching band around 1100 cm-1 upon complexation. Further spectral changes point towards a conformational change of the two chromophores that are attached to the crown ether. Density functional theory calculations indicate that the di-thiol ligand bridges two staple units on the cluster. The calculations furthermore reproduce the spectral shift of the C-O stretching vibrations upon complex formation and reveal a conformational change that involves the two chromophores attached to the crown ether. The functionalized clusters have therefore attractive ion sensing properties due to the combination of binding properties, mainly due to the crown ether, and the possibility for signal transduction via an induced conformational change involving chromophore units.
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Affiliation(s)
- Ani Baghdasaryan
- Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Elodie Brun
- Department of Organic Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Yuming Wang
- Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Giovanni Salassa
- Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Thomas Bürgi
- Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
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5
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Homberg A, Lacour J. From reactive carbenes to chiral polyether macrocycles in two steps - synthesis and applications made easy? Chem Sci 2020; 11:6362-6369. [PMID: 34094103 PMCID: PMC8152409 DOI: 10.1039/d0sc01011a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 03/11/2020] [Indexed: 12/26/2022] Open
Abstract
Chiral polyether macrocycles are versatile molecules. For their preparation, original two-step procedures were recently developed and present the advantages of high concentration conditions and simple starting reagents (stable diazo reagents, small cyclic ethers, aliphatic or aromatic amines). Enantiopure materials are readily afforded by CSP-HPLC on a semi-preparative scale. Flexibility and adaptability in the macrocyclic design are provided by a large selection of amines to choose from while the ring size and chemical nature are controlled by the choice of 5 to 7-membered cyclic ether precursors. Such macrocycles have already been used as asymmetric catalysts, mono and ditopic receptors, fluorescent sensors and probes, and chiroptical reversible switches.
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Affiliation(s)
- Alexandre Homberg
- Department of Organic Chemistry, University of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
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6
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Brun E, Zhang KF, Guénée L, Lacour J. Photo-induced thiol-ene reactions for late-stage functionalization of unsaturated polyether macrocycles: regio and diastereoselective access to macrocyclic dithiol derivatives. Org Biomol Chem 2020; 18:250-254. [PMID: 31808765 DOI: 10.1039/c9ob02375e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Double hydrothiolation of bis enol ether macrocycles was achieved under photo-mediated conditions. The thiol-ene reactions afford a fully regioselective anti-Markovnikov post-functionalization. Thanks to the use of ethanedithiol as reagent, moderate to excellent diastereoselectivity was accomplished leading to macrocycles containing four defined stereocenters in only three steps from 1,4-dioxane, tetrahydrofuran (THF) or tetrahydropyran (THP).
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Affiliation(s)
- Elodie Brun
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
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7
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Aster A, Licari G, Zinna F, Brun E, Kumpulainen T, Tajkhorshid E, Lacour J, Vauthey E. Tuning symmetry breaking charge separation in perylene bichromophores by conformational control. Chem Sci 2019; 10:10629-10639. [PMID: 34040711 PMCID: PMC8133027 DOI: 10.1039/c9sc03913a] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Understanding structure-property relationships in multichromophoric molecular architectures is a crucial step in establishing new design principles in organic electronics as well as to fully understand how nature exploits solar energy. Here, we study the excited state dynamics of three bichromophores consisting of two perylene chromophores linked to three different crown-ether backbones, using stationary and ultrafast electronic spectroscopy combined with molecular dynamics simulations. The conformational space available to the bichromophores depends on the structure and geometry of the crown-ether and can be significantly changed upon cation binding, strongly affecting the excited-state dynamics. We show that, depending on the conformational restrictions and the local environment, the nature of the excited state varies greatly, going from an excimer to a symmetry-broken charge separated state. These results can be rationalised in terms of a structure-property relationship that includes the effect of the local environment.
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Affiliation(s)
- Alexander Aster
- Department of Physical Chemistry, University of Geneva CH-1211 Geneva Switzerland
| | - Giuseppe Licari
- NIH Center for Macromolecular Modeling and Bioinformatics, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign Urbana Illinois USA.,Department of Biochemistry, Center for Biophysics and Quantitative Biology Urbana Illinois USA
| | - Francesco Zinna
- Department of Organic Chemistry, University of Geneva CH-1211 Geneva Switzerland
| | - Elodie Brun
- Department of Organic Chemistry, University of Geneva CH-1211 Geneva Switzerland
| | - Tatu Kumpulainen
- Department of Physical Chemistry, University of Geneva CH-1211 Geneva Switzerland
| | - Emad Tajkhorshid
- NIH Center for Macromolecular Modeling and Bioinformatics, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign Urbana Illinois USA.,Department of Biochemistry, Center for Biophysics and Quantitative Biology Urbana Illinois USA
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva CH-1211 Geneva Switzerland
| | - Eric Vauthey
- Department of Physical Chemistry, University of Geneva CH-1211 Geneva Switzerland
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8
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Homberg A, Hrdina R, Vishe M, Guénée L, Lacour J. Stereoselective deconjugation of macrocyclic α,β-unsaturated esters by sequential amidation and olefin transposition: application to enantioselective phase-transfer catalysis. Org Biomol Chem 2019; 17:6905-6910. [PMID: 31270519 DOI: 10.1039/c9ob01355e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The stereoselective synthesis of chiral macrocycles bearing two aliphatic amide functional groups is reported. After the amidation mediated by TBD, a guanidine derivative, the olefin transposition step is performed with a slight excess of t-BuOK. The products are afforded in moderate to good combined yields (up to 59%) and with an excellent syn diastereoselectivity (dr > 49 : 1). Introducing enantiopure α-branched substituents was possible and it resulted in mixtures of diastereomers, which could be tested as phase-transfer catalysts using the formation of a phenylalanine analog as a test reaction (up to 43% ee). A clear matched-mismatched situation was observed in the two diastereomeric series.
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Affiliation(s)
- Alexandre Homberg
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
| | - Radim Hrdina
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
| | - Mahesh Vishe
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
| | - Laure Guénée
- Laboratory of Crystallography, University of Geneva, Quai Ernest Ansermet 24, 1211 Geneva 4, Switzerland
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
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9
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Zinna F, Voci S, Arrico L, Brun E, Homberg A, Bouffier L, Funaioli T, Lacour J, Sojic N, Di Bari L. Circularly‐Polarized Electrochemiluminescence from a Chiral Bispyrene Organic Macrocycle. Angew Chem Int Ed Engl 2019; 58:6952-6956. [DOI: 10.1002/anie.201901303] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 03/07/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Francesco Zinna
- Dipartimento di Chimica e Chimica IndustrialeUniversity of Pisa via G. Moruzzi 13 56124 Pisa Italy
- Department of Organic ChemistryUniversity of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Silvia Voci
- Univ. BordeauxBordeaux INPCNRSInstitut des Sciences Moléculaires, UMR 5255 16 avenue Pey-Berland 33607 Pessac France
| | - Lorenzo Arrico
- Dipartimento di Chimica e Chimica IndustrialeUniversity of Pisa via G. Moruzzi 13 56124 Pisa Italy
| | - Elodie Brun
- Department of Organic ChemistryUniversity of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Alexandre Homberg
- Department of Organic ChemistryUniversity of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Laurent Bouffier
- Univ. BordeauxBordeaux INPCNRSInstitut des Sciences Moléculaires, UMR 5255 16 avenue Pey-Berland 33607 Pessac France
| | - Tiziana Funaioli
- Dipartimento di Chimica e Chimica IndustrialeUniversity of Pisa via G. Moruzzi 13 56124 Pisa Italy
| | - Jérôme Lacour
- Department of Organic ChemistryUniversity of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Neso Sojic
- Univ. BordeauxBordeaux INPCNRSInstitut des Sciences Moléculaires, UMR 5255 16 avenue Pey-Berland 33607 Pessac France
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica IndustrialeUniversity of Pisa via G. Moruzzi 13 56124 Pisa Italy
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10
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Zinna F, Voci S, Arrico L, Brun E, Homberg A, Bouffier L, Funaioli T, Lacour J, Sojic N, Di Bari L. Circularly‐Polarized Electrochemiluminescence from a Chiral Bispyrene Organic Macrocycle. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901303] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Francesco Zinna
- Dipartimento di Chimica e Chimica IndustrialeUniversity of Pisa via G. Moruzzi 13 56124 Pisa Italy
- Department of Organic ChemistryUniversity of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Silvia Voci
- Univ. BordeauxBordeaux INPCNRSInstitut des Sciences Moléculaires, UMR 5255 16 avenue Pey-Berland 33607 Pessac France
| | - Lorenzo Arrico
- Dipartimento di Chimica e Chimica IndustrialeUniversity of Pisa via G. Moruzzi 13 56124 Pisa Italy
| | - Elodie Brun
- Department of Organic ChemistryUniversity of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Alexandre Homberg
- Department of Organic ChemistryUniversity of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Laurent Bouffier
- Univ. BordeauxBordeaux INPCNRSInstitut des Sciences Moléculaires, UMR 5255 16 avenue Pey-Berland 33607 Pessac France
| | - Tiziana Funaioli
- Dipartimento di Chimica e Chimica IndustrialeUniversity of Pisa via G. Moruzzi 13 56124 Pisa Italy
| | - Jérôme Lacour
- Department of Organic ChemistryUniversity of Geneva Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Neso Sojic
- Univ. BordeauxBordeaux INPCNRSInstitut des Sciences Moléculaires, UMR 5255 16 avenue Pey-Berland 33607 Pessac France
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica IndustrialeUniversity of Pisa via G. Moruzzi 13 56124 Pisa Italy
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11
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Guo X, Yang Y, Peng Z, Cai Y, Feng W, Yuan L. Highly efficient synthesis of hydrogen-bonded aromatic tetramers as macrocyclic receptors for selective recognition of lithium ions. Org Chem Front 2019. [DOI: 10.1039/c9qo00612e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Lithium ion receptor based on novel hydrogen-bonded aromatic tetramer biphenyl-cyclo[4]aramide has been developed.
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Affiliation(s)
- Xuwen Guo
- College of Chemistry
- Key Laboratory for Radiation Physics and Technology of Ministry of Education
- Sichuan University
- Chengdu 610064
- China
| | - Yizhou Yang
- College of Chemistry
- Key Laboratory for Radiation Physics and Technology of Ministry of Education
- Sichuan University
- Chengdu 610064
- China
| | - Zhiyong Peng
- College of Chemistry
- Key Laboratory for Radiation Physics and Technology of Ministry of Education
- Sichuan University
- Chengdu 610064
- China
| | - Yimin Cai
- College of Chemistry
- Key Laboratory for Radiation Physics and Technology of Ministry of Education
- Sichuan University
- Chengdu 610064
- China
| | - Wen Feng
- College of Chemistry
- Key Laboratory for Radiation Physics and Technology of Ministry of Education
- Sichuan University
- Chengdu 610064
- China
| | - Lihua Yuan
- College of Chemistry
- Key Laboratory for Radiation Physics and Technology of Ministry of Education
- Sichuan University
- Chengdu 610064
- China
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12
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Panchenko PA, Zubenko AD, Chernikova EY, Fedorov YV, Pashanova AV, Karnoukhova VA, Fedyanin IV, Fedorova OA. Synthesis, structure and metal ion coordination of novel benzodiazamacrocyclic ligands bearing pyridyl and picolinate pendant side-arms. NEW J CHEM 2019. [DOI: 10.1039/c9nj03488a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complex formation of benzodiazacrown ethers with heavy and transition metal ions was studied using NMR spectroscopy, potentiometry and X-ray crystallography.
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Affiliation(s)
- Pavel A. Panchenko
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)
- Moscow
- Russia
- D. Mendeleev University of Chemical Technology of Russia
- Moscow
| | - Anastasia D. Zubenko
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)
- Moscow
- Russia
| | - Ekaterina Y. Chernikova
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)
- Moscow
- Russia
| | - Yuri V. Fedorov
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)
- Moscow
- Russia
| | - Anna V. Pashanova
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)
- Moscow
- Russia
- D. Mendeleev University of Chemical Technology of Russia
- Moscow
| | - Valentina A. Karnoukhova
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)
- Moscow
- Russia
| | - Ivan V. Fedyanin
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)
- Moscow
- Russia
- Plekhanov Russian University of Economics
- Moscow
| | - Olga A. Fedorova
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)
- Moscow
- Russia
- D. Mendeleev University of Chemical Technology of Russia
- Moscow
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13
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Letrun R, Lang B, Yushchenko O, Wilcken R, Svechkarev D, Kolodieznyi D, Riedle E, Vauthey E. Excited-state dynamics of a molecular dyad with two orthogonally-oriented fluorophores. Phys Chem Chem Phys 2018; 20:30219-30230. [PMID: 30489576 DOI: 10.1039/c8cp05356a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The excited-state dynamics of a T-shaped bichromophoric molecule, consisting of two strong fluorophores, diphenyloxazole and diphenylpyrazoline, directly linked in an orthogonal geometry, was investigated. Despite the weak coupling ensured by this geometry and confirmed by the electronic absorption spectra, this dyad exhibits only weak fluorescence in both apolar and polar solvents, with fluorescence lifetimes ranging from 200 ps in CHX to 10 ps in ACN. Ultrafast spectroscopic measurements reveal that the fluorescence quenching in polar solvents is due to the population of a charge-separated state. In non-polar solvents, this process is energetically not feasible, and a quenching due to an efficient intersystem crossing (ISC) to the triplet manifold is proposed, based on quantum-chemical calculations. This process occurs via the spin-orbit charge-transfer (SOCT) ISC mechanism, which is enabled by the charge-transfer character acquired by the S1 state of the dyad upon structural relaxation and by the orthogonal arrangement of the molecular orbitals involved in the transition. The same mechanism is proposed to explain why the recombination of the charge-separated state is faster in medium than in highly polar solvents, as well as to account for the fast decay of the lowest triplet state to the ground state.
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Affiliation(s)
- Romain Letrun
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland.
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14
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Homberg A, Brun E, Zinna F, Pascal S, Górecki M, Monnier L, Besnard C, Pescitelli G, Di Bari L, Lacour J. Combined reversible switching of ECD and quenching of CPL with chiral fluorescent macrocycles. Chem Sci 2018; 9:7043-7052. [PMID: 30310624 PMCID: PMC6137439 DOI: 10.1039/c8sc02935k] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 07/30/2018] [Indexed: 11/21/2022] Open
Abstract
A series of chiral fluorescent macrocycles display a remarkable combination of both +/– ECD and strong on/off CPL reversible switching upon cation binding and displacement.
Straightforward synthesis and resolution of a series of chiral fluorescent macrocycles are presented, together with their electronic circular dichroism (ECD), strong excimer fluorescence (EF, λ 300 to 650 nm) and allied highly circularly polarized luminescence (CPL, glum up to 1.7 × 10–2). The ECD, EF and CPL responses are strongly affected by the presence of metal ions (Na+, Ba2+) thanks to deep conformational changes. While ECD signals can be almost completely reversibly inverted upon the complexation/decomplexation of metal ions in a typical binary response, CPL signals are reversibly quenched concomitantly. The designed macrocycles display thus a remarkable combination of both +/– ECD and on/off CPL reversible switching.
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Affiliation(s)
- Alexandre Homberg
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , 1211 Geneva 4 , Switzerland .
| | - Elodie Brun
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , 1211 Geneva 4 , Switzerland .
| | - Francesco Zinna
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , 1211 Geneva 4 , Switzerland .
| | - Simon Pascal
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , 1211 Geneva 4 , Switzerland .
| | - Marcin Górecki
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Via Moruzzi 13 , 56124 Pisa , Italy
| | - Luc Monnier
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , 1211 Geneva 4 , Switzerland .
| | - Céline Besnard
- Laboratoire de Cristallographie , University of Geneva , Quai Ernest Ansermet 24 , 1211 Geneva 4 , Switzerland
| | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Via Moruzzi 13 , 56124 Pisa , Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Via Moruzzi 13 , 56124 Pisa , Italy
| | - Jérôme Lacour
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , 1211 Geneva 4 , Switzerland .
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15
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Ray SK, Homberg A, Vishe M, Besnard C, Lacour J. Efficient Synthesis of Ditopic Polyamide Receptors for Cooperative Ion Pair Recognition in Solution and Solid States. Chemistry 2018; 24:2944-2951. [DOI: 10.1002/chem.201704895] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Indexed: 12/12/2022]
Affiliation(s)
- Sumit Kumar Ray
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Alexandre Homberg
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Mahesh Vishe
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Céline Besnard
- Laboratory of Crystallography; University of Geneva; Quai Ernest Ansermet 24 1211 Geneva 4 Switzerland
| | - Jérôme Lacour
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
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