Sky-blue emitting bridged diiridium complexes: beneficial effects of intramolecular π–π stacking

Congrave, Daniel G.; Hsu, Yu-Ting; Batsanov, Andrei S.; Beeby, Andrew; Bryce, Martin R.

doi:10.1039/c7dt04201a

Sky-blue emitting bridged diiridium complexes: beneficial effects of intramolecular π–π stacking

Congrave, Daniel G.; Hsu, Yu-Ting; Batsanov, Andrei S.; Beeby, Andrew; Bryce, Martin R.

Authors

Daniel G. Congrave

Yu-Ting Hsu

Dr Andrei Batsanov a.s.batsanov@durham.ac.uk
Academic Visitor

Professor Andrew Beeby andrew.beeby@durham.ac.uk
Professor

Professor Martin Bryce m.r.bryce@durham.ac.uk
Professor

Abstract

The potential of intramolecular π–π interactions to influence the photophysical properties of diiridium complexes is an unexplored topic, and provides the motivation for the present study. A series of diarylhydrazide-bridged diiridium complexes functionalised with phenylpyridine (ppy)-based cyclometalating ligands is reported. It is shown by NMR studies in solution and single crystal X-ray analysis that intramolecular π–π interactions between the bridging and cyclometalating ligands rigidify the complexes leading to high luminescence quantum efficiencies in solution and in doped films. Fluorine substituents on the phenyl rings of the bridge promote the intramolecular π–π interactions. Notably, these non-covalent interactions are harnessed in the rational design and synthesis of the first examples of highly emissive sky-blue diiridium complexes featuring conjugated bridging ligands, for which they play a vital role in the structural and photophysical properties. Experimental results are supported by computational studies.

Citation

Congrave, D. G., Hsu, Y., Batsanov, A. S., Beeby, A., & Bryce, M. R. (2018). Sky-blue emitting bridged diiridium complexes: beneficial effects of intramolecular π–π stacking. Dalton Transactions, 47(6), 2086-2098. https://doi.org/10.1039/c7dt04201a

Journal Article Type	Article
Acceptance Date	Dec 13, 2017
Online Publication Date	Jan 22, 2018
Publication Date	Feb 14, 2018
Deposit Date	Dec 15, 2017
Publicly Available Date	Dec 15, 2017
Journal	Dalton Transactions
Print ISSN	1477-9226
Electronic ISSN	1477-9234
Publisher	Royal Society of Chemistry
Peer Reviewed	Peer Reviewed
Volume	47
Issue	6
Pages	2086-2098
DOI	https://doi.org/10.1039/c7dt04201a