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Issue 3, 2019
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Molecular isomeric engineering of naphthyl-quinoline-containing dinuclear platinum complexes to tune emission from deep red to near infrared

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Abstract

Four isomeric dinuclear platinum complexes of (C^N)2Pt2(μ-OXT)2 are synthesized and characterized with different C^N cyclometalating ligands and the same ancillary ligand of 5-(4-octylphenyl)-1,3,4-oxadiazole-2-thiol (μ-OXT). These isomeric C^N ligands are 1-naphthyl-1-isoquinoline (niq), 2-naphthyl-1-isoquinoline (2niq), 1-naphthyl-2-quinoline (nq) and 2-naphthyl-2-quinoline (2nq). The isomeric effect on the photophysical, electrochemical and electroluminescence properties of (C^N)2Pt2(μ-OXT)2 was systematically studied. It is found that the emissions were easy to tune from deep red to near infrared for (C^N)2Pt2(μ-OXT)2 by changing the C^N isomers. Furthermore, the complexes with 2-naphthyl presented better electroluminescence (EL) properties than the complexes with 1-naphthyl in these solution-processable polymeric light-emitting devices. In contrast to the (2nq)2Pt2(μ-OXT)2-doped devices displaying a deep-red emission peaked at 686 nm with an external quantum efficiency (EQE) of 3.21%, the (2niq)2Pt2(μ-OXT)2-doped devices exhibited a near-infrared emission peaked at 704 nm with a significantly increased EQE of 8.86% and a radiant emittance of 986 μW cm−2. Our research provides an efficient strategy to tune emission from deep red to near infrared by a simple isomeric engineering of dinuclear platinum(II) complexes.

Graphical abstract: Molecular isomeric engineering of naphthyl-quinoline-containing dinuclear platinum complexes to tune emission from deep red to near infrared

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Publication details

The article was received on 18 Oct 2018, accepted on 04 Dec 2018 and first published on 02 Jan 2019


Article type: Paper
DOI: 10.1039/C8TC05263H
Citation: J. Mater. Chem. C, 2019,7, 630-638
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    Molecular isomeric engineering of naphthyl-quinoline-containing dinuclear platinum complexes to tune emission from deep red to near infrared

    W. Xiong, F. Meng, C. You, P. Wang, J. Yu, X. Wu, Y. Pei, W. Zhu, Y. Wang and S. Su, J. Mater. Chem. C, 2019, 7, 630
    DOI: 10.1039/C8TC05263H

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