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Issue 3, 2017
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Synthesis and characterization of phosphorescent two-coordinate copper(I) complexes bearing diamidocarbene ligands

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Abstract

The photophysical properties of four, two-coordinate, linear diamidocarbene copper(I) complexes, [(DAC)2Cu][BF4] (1), (DAC)CuOSiPh3 (2), (DAC)CuC6F5 (3) and (DAC)Cu(2,4,6-Me3C6H2) (4) (DAC = 1,3-bis(2,4,6-trimethylphenyl)-5,5-dimethyl-4,6-diketopyrimidinyl-2-ylidene) have been investigated. Complex 1 shows a high photoluminescence quantum efficiency (ΦPL) in both the solid state (ΦPL = 0.85) and in CH2Cl2 solution (ΦPL = 0.65). The emission band of 1, both as a crystalline solid and in solution, is narrow (fwhm = 2300 cm−1) relative to the emission bands of 2 (fwhm = 2900 cm−1) and 3 (fwhm = 3700 cm−1). Complexes 2 and 3 are each brightly luminescent in the solid state (ΦPL = 0.62 and 0.18, respectively), but markedly less so in CH2Cl2 solution (ΦPL = 0.03 and <0.01, respectively). Complex 4 is not emissive in either the solid state or in solution. Phosphorescence of 1 in CH2Cl2 solution shows negligible quenching by oxygen in CH2Cl2 solution. This insensitivity to quenching is attributed to the excited state redox potential being insufficient for electron transfer to oxygen.

Graphical abstract: Synthesis and characterization of phosphorescent two-coordinate copper(i) complexes bearing diamidocarbene ligands

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Publication details

The article was received on 19 Oct 2016, accepted on 09 Dec 2016 and first published on 12 Dec 2016


Article type: Paper
DOI: 10.1039/C6DT04016K
Citation: Dalton Trans., 2017,46, 745-752
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    Synthesis and characterization of phosphorescent two-coordinate copper(I) complexes bearing diamidocarbene ligands

    S. Shi, L. R. Collins, M. F. Mahon, P. I. Djurovich, M. E. Thompson and M. K. Whittlesey, Dalton Trans., 2017, 46, 745
    DOI: 10.1039/C6DT04016K

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