Synthesis, Structure and Photophysical Properties of Pyrene-based [5]Helicenes: an Experimental and Theoretical Study

Abstract : Pyrene-cored [5]helicenes were prepared by a facile, efficient Wittig reaction and an intramolecular photocyclization reaction utilising 2,7-di-tert-butylpyrene-4-carbaldehyde and naphthalene/pyrene-based phosphorus ylides. Optical properties based on UV À vis absorption and fluorescence spectra were investigated. X-ray crystallography revealed that the pyrene-based [5]helicenes exhibited strong face-to-face p À p interactions and edge-to-face p À p interactions. HOMO and LUMO energies and molecular orbitals were also studied by density functional theory (DFT) calculations. This study has revealed that the torsion angle of the helical structure plays a role in determining the p À p interactions and the frontier molecular orbital energy levels. Thus, pyrene-based helicenes need to be considered when one designs new highly efficient organic light-emitting diodes and organic semiconductor materials.
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Submitted on : Tuesday, February 7, 2017 - 1:54:37 PM
Last modification on : Thursday, May 23, 2019 - 10:10:03 AM

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Chuan-Zeng Wang, Rie Kihara, Xing Feng, Pierre Thuéry, Carl Redshaw, et al.. Synthesis, Structure and Photophysical Properties of Pyrene-based [5]Helicenes: an Experimental and Theoretical Study. ChemistrySelect, Wiley, 2017, 2, pp.1436 - 1441. ⟨http://onlinelibrary.wiley.com/doi/10.1002/slct.201601327/full⟩. ⟨10.1002/slct.201601327⟩. ⟨cea-01459698⟩

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