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Pyrene-based Y-shaped solid-state blue emitters: Synthesis, characterization, and photoluminescence

Feng, Xing; Hu, Jian Yong; Yi, Liu; Seto, Nobuyuki; Tao, Zhu; Redshaw, Carl; Elsegood, Mark R.J.; Yamato, Takehiko

Authors

Xing Feng

Jian Yong Hu

Liu Yi

Nobuyuki Seto

Zhu Tao

Mark R.J. Elsegood

Takehiko Yamato



Abstract

A series of pyrene-based Y-shaped blue emitters, namely, 7-tert-butyl-1,3-diarylpyrenes 4 were synthesized by the Suzuki cross-coupling reaction of 7-tert-butyl-1,3-dibromopyrene with a variety of p-substituted phenylboronic acids in good to excellent yields. These compounds were fully characterized by X-ray crystallography, UV/Vis absorption and fluorescence spectroscopy, DFT calculations, thermogravimetric analysis, and differential scanning calorimetry. Single-crystal X-ray analysis revealed that the Y-shaped arylpyrenes exhibited a low degree of π stacking owing to the steric effect of the bulky tert-butyl group in the pyrene ring at the 7-position, and thus, the intermolecular π-π interactions were effectively suppressed in the solid state. Despite the significantly twisted nonplanar structures, these molecules still displayed efficient intramolecular charge-transfer emissions with clear solvatochromic shifts on increasing solvent polarity. An intriguing fact is that all of these molecules show highly blue emissions with excellent quantum yields in the solid state. Additionally, the two compounds containing the strongest electron-accepting groups, CN (4 d) and CHO (4 f), possess high thermal stability, which, together with their excellent solid-state fluorescence efficiency, makes them promising potential blue emitters in organic light-emitting device applications. Shades of blue: Pyrene-based Y-shaped blue solid-state emitters, 7-tert-butyl-1,3-diarylpyrenes 1, were synthesized by Suzuki cross-coupling reactions in good to excellent yields. Studies on single-crystal X-ray structures and the photophysical properties of these compounds strongly suggest that they are promising blue emitters in organic light-emitting device applications. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Citation

Feng, X., Hu, J. Y., Yi, L., Seto, N., Tao, Z., Redshaw, C., Elsegood, M. R., & Yamato, T. (2012). Pyrene-based Y-shaped solid-state blue emitters: Synthesis, characterization, and photoluminescence. Chemistry - An Asian Journal, 7(12), 2854-2863. https://doi.org/10.1002/asia.201200530

Journal Article Type Article
Publication Date Dec 1, 2012
Deposit Date Jun 8, 2022
Journal Chemistry - An Asian Journal
Print ISSN 1861-4728
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 7
Issue 12
Pages 2854-2863
DOI https://doi.org/10.1002/asia.201200530
Public URL https://hull-repository.worktribe.com/output/3622150