Search

Your search keyword '"Etienne, S."' showing total 10 results
Start Over Author "Etienne, S." Topic phosphorescence
10 results on '"Etienne, S."'

1. Long‐Lived Circularly Polarized Phosphorescence in Helicene‐NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties

Author

Nicolas Vanthuyne, Nora Hellou, Elsa Caytan, Ludovic Favereau, Jochen Autschbach, J. A. Gareth Williams, Monika Srebro-Hooper, Etienne S. Gauthier, Benoît Darquié, Thierry Roisnel, Laura Abella, Jeanne Crassous, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synthèse Caractérisation Analyse de la Matière (ScanMAT), Université de Rennes (UR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), State University of New York (SUNY), Laboratoire de Physique des Lasers (LPL), Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS)-Université Sorbonne Paris Nord, Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Durham University, Agence Nationale de la Recherche. Grant Numbers: ANR-16-CE07-0019, ANR-15-CE30-0005-01, National Science Foundation. Grant Number: CHE-1855470, ANR-16-CE07-0019,HEL-NHC,Carbènes N-hétérocycliques (NHC) hélicéniques: synthèse, structure, propriétés photophysiques et activité catalytique(2016), ANR-15-CE30-0005,PVCM,Violation de la parité dans les molécules chirales(2015), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut de Chimie du CNRS (INC), and Centre National de la Recherche Scientifique (CNRS)-Université Sorbonne Paris Nord

Subjects
chemistry.chemical_element, Quantum yield, circularly polarized emission, Photochemistry, 010402 general chemistry, 01 natural sciences, Catalysis, chemistry.chemical_compound, [CHIM]Chemical Sciences, helicene, Ligand, 010405 organic chemistry, long-lived phosphorescence, General Chemistry, General Medicine, Rhenium, 3. Good health, 0104 chemical sciences, Enantiopure drug, chemistry, Helicene, Halogen, Phosphorescence, N-heterocyclic carbene, Carbene, rhenium(I)
Abstract

International audience; The first enantiopure chiral-at-rhenium complexes of the form fac-ReX(CO) (:C^N) have been prepared, where :C^N is a helicene-N-heterocyclic carbene (NHC) ligand and X=Cl or I. These have complexes show strong changes in the emission characteristics, notably strongly enhanced phosphorescence lifetimes (reaching 0.7 ms) and increased circularly polarized emission (CPL) activity, as compared to their parent chiral models lacking the helicene unit. The halogen along with its position within the dissymmetric stereochemical environment strongly affect the photophysics of the complexes, particularly the phosphorescence quantum yield and lifetime. These results give fresh insight into fine tuning of photophysical and chiroptical properties of Re-NHC systems.

Published
2020
Full Text
View/download PDF

2. Helically chiral NHC‐gold(I) complexes: synthesis, chiroptical properties and electronic features of the [5]helicene‐imidazolylidene ligand

Author

Vincent Dorcet, J. A. Gareth Williams, Ludovic Favereau, Marie Cordier, Etienne S. Gauthier, Nicolas Vanthuyne, Jeanne Crassous, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Durham University, Agence Nationale de la Recherche French National Research Agency (ANR) [ANR-16-CE07-0019], European Commission, ANR-16-CE07-0019,HEL-NHC,Carbènes N-hétérocycliques (NHC) hélicéniques: synthèse, structure, propriétés photophysiques et activité catalytique(2016), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Helicene, Circular dichroism, Denticity, 010405 organic chemistry, Ligand, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Dual emission, Organic Chemistry, Organometallics, Gold(I), Carbene, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Crystallography, CPL, chemistry, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, Phosphorescence
Abstract

International audience; We describe the preparation of helically chiral gold(I) complexes bearing a [5]helicenic-N-heterocyclic carbene ligand. They were successfully obtained as enantiopure compounds by semi-preparative chiral HPLC and their structural, chiroptical, and photophysical properties were subsequently investigated. Notably, strong electronic circular dichroism, dual emission from singlet and triplet states, with the timescale of the latter up to the millisecond range at room temperature, and moderate circularly phosphorescence were observed. The sigma-donating and pi-accepting properties of the constituent helical ortho-fused pi-conjugated carbene were investigated by classical quantitative analysis of the IR stretching frequencies and NMR characteristics of the corresponding Ir(CO)(2)Cl complex and selenourea.

Published
2021
Full Text
View/download PDF

3. Triskelion-shaped iridium-helicene NHC complex

Author

Vincent Dorcet, Nora Hellou, Samuel Del Fré, J. A. Gareth Williams, Etienne S. Gauthier, Elsa Caytan, Nicolas Vanthuyne, Ludovic Favereau, Jeanne Crassous, Monika Srebro-Hooper, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Durham University, Agence Nationale de la Recherche French National Research Agency (ANR) European Commission [ANR-16-CE07-0019], IR-RMN-THC FR3050 CNRS, ANR-16-CE07-0019,HEL-NHC,Carbènes N-hétérocycliques (NHC) hélicéniques: synthèse, structure, propriétés photophysiques et activité catalytique(2016), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Circular dichroism, 010405 organic chemistry, Chemistry, Ligand, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, 3. Good health, 0104 chemical sciences, Inorganic Chemistry, chemistry.chemical_compound, Crystallography, Enantiopure drug, Helicene, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Iridium, Optical rotation, Phosphorescence, Carbene
Abstract

International audience; Enantiopure tris-helicenic chiral-at-iridium complexes have been prepared, constituting the first examples of organometallic metal-tris-helicenes. They have the mer- or fac-Ir(CC:)(3) form, where (CC:) is an N-heterocyclic carbene ligand N-substituted with a hexahelicene. Their triskelion geometry and stereochemistry have been thoroughly studied and assigned by NMR in combination with quantum-chemical modelling and by comparison with the X-ray structure of analogues. Thanks to their Ir(iii)-based multihelicenic architecture, the complexes display strong electronic circular dichroism and optical rotation along with long-lived yellow phosphorescence, involving circularly polarized emission with g(lum) factors around 10(-3).

Published
2021
Full Text
View/download PDF

4. An enantiopure cyclometallated iridium complex displaying long-lived phosphorescence both in solution and in the solid state

Author

Etienne S. Gauthier, Nora Hellou, Ludovic Favereau, Aurélie Macé, Elsa Caytan, Ghassan Nasser, Clothilde Martin, Fabienne Berrée, Nicolas Vanthuyne, Bertrand Carboni, Jeanne Crassous, J. A. Gareth Williams, Joanna Hammoud, Thierry Roisnel, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université Libanaise, Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Duke University [Durham], Ministere de l'Education Nationale, de la Recherche et de la Technologie, Centre National e la Recherche Scientifique (CNRS), CNRS(Chirafun network), ANR [12-BS07-0004-METALHEL-01, ANR-16-CE07-0019-01-HEL-NHC], Rennes-Durham Associated International Laboratory (IAL MMC), ANR-16-CE07-0019,HEL-NHC,Carbènes N-hétérocycliques (NHC) hélicéniques: synthèse, structure, propriétés photophysiques et activité catalytique(2016), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Durham University

Subjects
Circular dichroism, optical activity, cyclometallated, Solid-state, chemistry.chemical_element, chirality, 010402 general chemistry, 01 natural sciences, Biochemistry, Catalysis, Inorganic Chemistry, helicenes, chemistry.chemical_compound, Drug Discovery, [CHIM]Chemical Sciences, Iridium, Physical and Theoretical Chemistry, helicene, 010405 organic chemistry, Chemistry, long-lived phosphorescence, Organic Chemistry, iridium, 0104 chemical sciences, Crystallography, Enantiopure drug, cyclometallated complexes, Helicene, Phosphorescence, Chirality (chemistry), Luminescence
Abstract

International audience; A new enantiopure cyclometallated iridium complex bearing a [4]helicenic C perpendicular to C--coordinating and two N perpendicular to C--coordinating dfppy (2-(2,4-difluorophenyl)-pyridyl) ligands was prepared. This complex displayed long-lived phosphorescence both in solution and in the solid state. Its chiroptical properties, namely electronic circular dichroism and circularly polarized luminescence, were also examined. Comparison with former chiral complexes enabled assignment of the Delta(Ir)-(-) and ? (Ir)-(+) absolute configurations.

Published
2019
Full Text
View/download PDF

5. Helically Chiral NHC‐Gold(I) Complexes: Synthesis, Chiroptical Properties and Electronic Features of the [5]Helicene‐Imidazolylidene Ligand.

Author

Gauthier, Etienne S., Cordier, Marie, Dorcet, Vincent, Vanthuyne, Nicolas, Favereau, Ludovic, Williams, J. A. Gareth, and Crassous, Jeanne

Subjects
*PHOSPHORESCENCE spectroscopy, *CIRCULAR dichroism, *PHOSPHORIMETRY, *CARBENES, *HIGH performance liquid chromatography, *PHOSPHORESCENCE
Abstract

We describe the preparation of helically chiral gold(I) complexes bearing a [5]helicenic‐N‐heterocyclic carbene ligand. They were successfully obtained as enantiopure compounds by semi‐preparative chiral HPLC and their structural, chiroptical, and photophysical properties were subsequently investigated. Notably, strong electronic circular dichroism, dual emission from singlet and triplet states, with the timescale of the latter up to the millisecond range at room temperature, and moderate circularly phosphorescence were observed. The σ‐donating and π‐accepting properties of the constituent helical ortho‐fused π‐conjugated carbene were investigated by classical quantitative analysis of the IR stretching frequencies and NMR characteristics of the corresponding Ir(CO)2Cl complex and selenourea. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

6. Long‐Lived Circularly Polarized Phosphorescence in Helicene‐NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties.

Author

Gauthier, Etienne S., Abella, Laura, Hellou, Nora, Darquié, Benoît, Caytan, Elsa, Roisnel, Thierry, Vanthuyne, Nicolas, Favereau, Ludovic, Srebro‐Hooper, Monika, Williams, J. A. Gareth, Autschbach, Jochen, and Crassous, Jeanne

Subjects
*PHOSPHORESCENCE, *RHENIUM, *STEREOCHEMISTRY, *HALOGENS, *HELICENES
Abstract

The first enantiopure chiral‐at‐rhenium complexes of the form fac‐ReX(CO)3(:C^N) have been prepared, where :C^N is a helicene‐N‐heterocyclic carbene (NHC) ligand and X=Cl or I. These have complexes show strong changes in the emission characteristics, notably strongly enhanced phosphorescence lifetimes (reaching 0.7 ms) and increased circularly polarized emission (CPL) activity, as compared to their parent chiral models lacking the helicene unit. The halogen along with its position within the dissymmetric stereochemical environment strongly affect the photophysics of the complexes, particularly the phosphorescence quantum yield and lifetime. These results give fresh insight into fine tuning of photophysical and chiroptical properties of Re‐NHC systems. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

7. Frontispiz: Long‐Lived Circularly Polarized Phosphorescence in Helicene‐NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties.

Author

Gauthier, Etienne S., Abella, Laura, Hellou, Nora, Darquié, Benoît, Caytan, Elsa, Roisnel, Thierry, Vanthuyne, Nicolas, Favereau, Ludovic, Srebro‐Hooper, Monika, Williams, J. A. Gareth, Autschbach, Jochen, and Crassous, Jeanne

Subjects
*RHENIUM, *PHOSPHORESCENCE, *STEREOCHEMISTRY, *HALOGENS, *HELICENES
Abstract

Frontispiz: Long-Lived Circularly Polarized Phosphorescence in Helicene-NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties Keywords: circularly polarized emission; helicenes; N-heterocyclic carbenes; phosphorescence; rhenium(I) EN circularly polarized emission helicenes N-heterocyclic carbenes phosphorescence rhenium(I) 1 1 1 05/18/20 20200525 NES 200525 B Chiroptische Verbindungen b In ihrer Zuschrift auf S. 8472 beschreiben J. A. G. Williams, J. Autschbach, J. Crassous et al. die Synthese von Rhenium(I)/NHC-Helicen-Komplexen mit zirkular polarisierter Phosphoreszenz sowie photophysikalische Untersuchungen dieser Verbindungen. Circularly polarized emission, helicenes, N-heterocyclic carbenes, phosphorescence, rhenium(I). [Extracted from the article]

Published
2020
Full Text
View/download PDF

8. Innentitelbild: Long‐Lived Circularly Polarized Phosphorescence in Helicene‐NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties (Angew. Chem. 22/2020).

Author

Gauthier, Etienne S., Abella, Laura, Hellou, Nora, Darquié, Benoît, Caytan, Elsa, Roisnel, Thierry, Vanthuyne, Nicolas, Favereau, Ludovic, Srebro‐Hooper, Monika, Williams, J. A. Gareth, Autschbach, Jochen, and Crassous, Jeanne

Subjects
*RHENIUM, *PHOSPHORESCENCE, *STEREOCHEMISTRY, *HALOGENS, *HELICENES
Abstract

Innentitelbild: Long-Lived Circularly Polarized Phosphorescence in Helicene-NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties (Angew. Keywords: circularly polarized emission; helicenes; N-heterocyclic carbenes; phosphorescence; rhenium(I) EN circularly polarized emission helicenes N-heterocyclic carbenes phosphorescence rhenium(I) 8382 8382 1 05/18/20 20200525 NES 200525 B Zeitaufgelöste impulsive b stimulierte Raman-Spektroskopie, eine ultraschnelle Raman-Technik, ermöglicht es, Momentaufnahmen von Molekülen im angeregten Zustand mit hoher Empfindlichkeit und Zeitauflösung zu gewinnen. Circularly polarized emission, helicenes, N-heterocyclic carbenes, phosphorescence, rhenium(I). [Extracted from the article]

Published
2020
Full Text
View/download PDF

9. Inside Cover: Long‐Lived Circularly Polarized Phosphorescence in Helicene‐NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties (Angew. Chem. Int. Ed. 22/2020).

Author

Gauthier, Etienne S., Abella, Laura, Hellou, Nora, Darquié, Benoît, Caytan, Elsa, Roisnel, Thierry, Vanthuyne, Nicolas, Favereau, Ludovic, Srebro‐Hooper, Monika, Williams, J. A. Gareth, Autschbach, Jochen, and Crassous, Jeanne

Subjects
*PHOSPHORESCENCE, *RHENIUM, *STEREOCHEMISTRY, *HALOGENS, *HELICENES
Published
2020
Full Text
View/download PDF

10. An Enantiopure Cyclometallated Iridium Complex Displaying Long‐Lived Phosphorescence both in Solution and in the Solid State.

Author

Macé, Aurélie, Hellou, Nora, Hammoud, Joanna, Martin, Clothilde, Gauthier, Etienne S., Favereau, Ludovic, Roisnel, Thierry, Caytan, Elsa, Nasser, Ghassan, Vanthuyne, Nicolas, Williams, J. A. Gareth, Berrée, Fabienne, Carboni, Bertrand, and Crassous, Jeanne

Subjects
*PHOSPHORESCENCE, *SOLID solutions, *IRIDIUM, *CIRCULAR dichroism, *LUMINESCENCE, *OPTICAL rotation
Abstract

A new enantiopure cyclometallated iridium complex bearing a [4]helicenic :C∧C- ‐coordinating and two :N∧C- ‐coordinating dfppy (2‐(2,4‐difluorophenyl)‐pyridyl) ligands was prepared. This complex displayed long‐lived phosphorescence both in solution and in the solid state. Its chiroptical properties, namely electronic circular dichroism and circularly polarized luminescence, were also examined. Comparison with former chiral complexes enabled assignment of the ΔIr‐(−) and ΛIr‐(+) absolute configurations. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results