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Das S, Singh HB, Butcher RJ. Synthesis and Characterization of 22‐, 28‐ and 32‐Membered Mercuraazamacrocycles: Isolation of Ring‐Chain Tautomer and Se/Te‐Containing Macrocycles. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800562] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shikha Das
- Department of Chemistry Indian Institute of Technology Bombay 400076 Powai Mumbai India
| | - Harkesh B. Singh
- Department of Chemistry Indian Institute of Technology Bombay 400076 Powai Mumbai India
| | - Ray J. Butcher
- Department of Chemistry Howard University 20059 Washington DC USA
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Biet T, Martin K, Hankache J, Hellou N, Hauser A, Bürgi T, Vanthuyne N, Aharon T, Caricato M, Crassous J, Avarvari N. Triggering Emission with the Helical Turn in Thiadiazole-Helicenes. Chemistry 2016; 23:437-446. [PMID: 27763709 DOI: 10.1002/chem.201604471] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Indexed: 01/17/2023]
Abstract
Introduction of heterocycles into the helical skeleton of helicenes allows modulation of their redox, chiroptical, and photophysical properties. This paper describes the straightforward preparation and structural characterization by single-crystal X-ray diffraction of thiadiazole-[7]helicene, which was resolved into M and P enantiomers by chiral HPLC, together with its S-shaped double [4]helicene isomer, as well as the smaller congeners thiadiazole-[5]helicene and benzothiadiazole-anthracene. A copper(II) complex with two thiadiazole-[5]helicene ligands was structurally characterized, and it shows the presence of both M and P isomers coordinated to the metal center. The emission properties of the heterohelicenes are highly dependent on the helical turn, as the [7]- and [5]helicene are poorly emissive, whereas their isomers, that is, the S-shaped double [4]helicene and thiadiazole-benzanthracene, are luminescent, with quantum efficiencies of 5.4 and 6.5 %, respectively. DFT calculations suggest quenching of the luminescence of enantiopure [7]helicenes through an intersystem-crossing mechanism arising from the relaxed excited S1 state.
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Affiliation(s)
- Thomas Biet
- Université d'Angers, CNRS UMR 6200, Laboratoire MOLTECH-Anjou, 2 bd Lavoisier, 49045, Angers, France
| | - Kévin Martin
- Université d'Angers, CNRS UMR 6200, Laboratoire MOLTECH-Anjou, 2 bd Lavoisier, 49045, Angers, France
| | - Jihane Hankache
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, 1211, Geneva, Switzerland
| | - Nora Hellou
- Institut des Sciences Chimiques de Rennes, UMR 6226, CNRS - Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France
| | - Andreas Hauser
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, 1211, Geneva, Switzerland
| | - Thomas Bürgi
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, 1211, Geneva, Switzerland
| | - Nicolas Vanthuyne
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille , France
| | - Tal Aharon
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas, 66045, USA
| | - Marco Caricato
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas, 66045, USA
| | - Jeanne Crassous
- Institut des Sciences Chimiques de Rennes, UMR 6226, CNRS - Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France
| | - Narcis Avarvari
- Université d'Angers, CNRS UMR 6200, Laboratoire MOLTECH-Anjou, 2 bd Lavoisier, 49045, Angers, France
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