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

Alexander V. Artem'Ev, Maxim R. Ryzhikov, Ilya V. Taidakov, Mariana I. Rakhmanova, Evgenia A. Varaksina, Irina Yu Bagryanskaya, Svetlana F. Malysheva, Nataliya A. Belogorlova

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2701-2710
Number of pages10
JournalDalton Transactions
Volume47
Issue number8
DOIs
Publication statusPublished - 20 Feb 2018

Keywords

  • COPPER IODIDE CLUSTERS
  • TRANSFER RADICAL-ADDITION
  • THERMOCHROMIC-LUMINESCENCE
  • ELECTRON LOCALIZATION
  • ELECTROCHEMICAL-CELLS
  • METAL(I) COMPOUNDS
  • CUPROUS COMPLEXES
  • PHOSPHINE-LIGANDS
  • VISIBLE-LIGHT
  • DIVERSITY

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