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Substituent steric effect boosting phosphorescence efficiency of PtCu2 complexes

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Abstract

We describe herein a viable approach to enhance phosphorescence efficiency in PtCu2 complexes with aromatic acetylides by the use of bis(di-2-tolylphosphinomethyl)phenylphosphine (dTolmp) in place of bis(diphenylphosphinomethyl)-phenylphosphine (dpmp) as a supporting ligand. Relative to dpmp-supported PtCu2 complexes, dTolmp-supported complexes having the same acetylide ligands show not only a 16–36 nm red-shift of the emission peaks, but also a dramatic phosphorescence enhancement. The phosphorescence quantum yields of dTolmp-supported PtCu2 complexes are boosted to 6.6 and 11.6 times as high as those of the dpmp-supported ones in CH2Cl2 solutions and the solid state, respectively. From dpmp to dTolmp, introducing sterically hindered 2-methyl groups to phenyl rings not only improves the π-conjugation character of PtCu2 complexes, but also effectively inhibits the deactivation process of the triplet excited state through non-radiative relaxation. The phosphorescence properties were systematically modulated in a wide spectral range from 502 to 672 nm by introducing electron-donating or electron-withdrawing substituents into aromatic acetylides.

Graphical abstract: Substituent steric effect boosting phosphorescence efficiency of PtCu2 complexes

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Article information


Submitted
13 Jan 2020
Accepted
27 Feb 2020
First published
27 Feb 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Substituent steric effect boosting phosphorescence efficiency of PtCu2 complexes

Z. Wang, J. Wang, L. Zhang, M. Yang, X. Zhang and Z. Chen, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC00200C

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