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Issue 26, 2019
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Luminescent properties of a 3,5-diphenylpyrazole bridged Pt(ii) dimer

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We report the synthesis, electrochemistry, photophysical properties and electroluminescence of a highly luminescent pyrazolate-bridged platinum(II) complex. The complex has the general formula of [((N^C^N)Pt)2(μ-pz)][PF6] where N^C^N = 1,3-di(2-pyridyl)benzene and μ-pz = 3,5-diphenylpyrazolate. The X-ray structure shows that the bridging pyrazolate ligand causes a close Pt–Pt interaction of 3.05(7) Å. The emission profile of the complex was determined in solution, glassy 2-methyltetrahydrofurane at 77 K, and the solid state at both room temperature and 77 K. Each emission profile displayed a strong red metal–metal-to-ligand charge transfer while the solution and glassy 2-methyltetrahydrofurane emission profiles also displayed a ligand-centred transition. The absolute quantum yields of the complex in solution and the solid state at room temperate are 86% and 39%, respectively. Light-emitting electrochemical cells (LEECs) of [((N^C^N)Pt)2(μ-pz)][PF6] were fabricated which displayed appreciable electroluminescence, among the brightest and most efficient LEECs from dinuclear compounds to date.

Graphical abstract: Luminescent properties of a 3,5-diphenylpyrazole bridged Pt(ii) dimer

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Article information

21 Feb 2019
25 Mar 2019
First published
25 Mar 2019

Dalton Trans., 2019,48, 9684-9691
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Author version available

Luminescent properties of a 3,5-diphenylpyrazole bridged Pt(II) dimer

L. M. Cinninger, L. D. Bastatas, Y. Shen, B. J. Holliday and J. D. Slinker, Dalton Trans., 2019, 48, 9684
DOI: 10.1039/C9DT00795D

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