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Issue 8, 2018
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Bright green-to-yellow emitting Cu(i) complexes based on bis(2-pyridyl)phosphine oxides: synthesis, structure and effective thermally activated-delayed fluorescence

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Abstract

A family of brightly luminescent dinuclear complexes of [Cu(μ2-X)(N^N)]2 type (X = I or SCN) has been synthesized in 76–90% yields by the reaction of bis(2-pyridyl)phosphine oxides (N^N) with the corresponding Cu(I) salts. The X-ray diffraction study reveals that the Cu2I2 core of the [Cu(μ2-I)(N^N)]2 complexes has either a butterfly- or rhomboid-shaped structure, while the eighth-membered [Cu(SCNNCS)Cu] ring in the [Cu2(SCN)2(N^N)]2 complexes is nearly planar. In the solid state, these compounds exhibit a strong green-to-yellow emission (λemmax = 536–592 nm) with high PLQYs (up to 63%) and short lifetimes (1.9–10.0 μs). The combined photophysical and DFT study indicates that the ambient-temperature emission of the complexes obtained can be assigned to the thermally activated-delayed fluorescence (TADF) from the 1(M + X)LCT excited state, while at 77 K, phosphorescence from the 3(M + X)LCT state is likely observed.

Graphical abstract: Bright green-to-yellow emitting Cu(i) complexes based on bis(2-pyridyl)phosphine oxides: synthesis, structure and effective thermally activated-delayed fluorescence

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Supplementary files

Article information


Submitted
17 Dec 2017
Accepted
20 Jan 2018
First published
22 Jan 2018

Dalton Trans., 2018,47, 2701-2710
Article type
Paper

Bright green-to-yellow emitting Cu(I) complexes based on bis(2-pyridyl)phosphine oxides: synthesis, structure and effective thermally activated-delayed fluorescence

A. V. Artem'ev, M. R. Ryzhikov, I. V. Taidakov, M. I. Rakhmanova, E. A. Varaksina, I. Yu. Bagryanskaya, S. F. Malysheva and N. A. Belogorlova, Dalton Trans., 2018, 47, 2701 DOI: 10.1039/C7DT04758D

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