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Towards Blue Emitting Monocyclometalated Gold(III) Complexes – Synthesis, Characterization and Photophysical Investigations

Abstract

Blue emitting phosphorescent materials with high efficiency and high stability are key requirement for the wider adoption of organic light emitting devices (OLEDs). In order to achieve triplet derived emission at the higher energy region of the electromagnetic spectrum, a series of neutral, monocyclometalated gold(III) complexes with trifluoromethyl and trifluoromethoxy functionalized 2-phenylpyridine (ppy) derivatives, 2-anilinopyridine (apy), 2-benzoylpyridine (bpy) and 2-benzylpyridine (bepy) as the cyclometalating framework and diaryl or monoaryl alkyne as ancillary ligands have been designed and synthesized. Extensive photophysical and chemical characterization by various nuclear magnetic resonance spectroscopy techniques, elemental analysis and single crystal X-ray diffraction studies of selected compounds were carried out to confirm the structural as well as the chemical identity of the complexes. The emission wavelength maxima of the complexes appear in the blue/sky blue region of the electromagnetic spectrum. Detailed photophysical investigations reveal the different emission properties of the complexes are predominantly dictated by the electronic properties of the cyclometalating ligand. The interesting photoluminescent properties along with the facile synthetic access makes this a promising concept to access highly suitable blue emitting gold(III) complexes.

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Publication details

The article was received on 21 Dec 2018, accepted on 12 Feb 2019 and first published on 12 Feb 2019


Article type: Paper
DOI: 10.1039/C8DT05034A
Citation: Dalton Trans., 2019, Accepted Manuscript

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    Towards Blue Emitting Monocyclometalated Gold(III) Complexes – Synthesis, Characterization and Photophysical Investigations

    M. Bachmann, R. Fessler, O. Blacque and K. Venkatesan, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C8DT05034A

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