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Photoluminescence properties of TADF-emitting three-coordinate silver(I) halide complexes with diphosphine ligands: a comparison study with copper(I) complexes

Abstract

Synthesis and X-ray structures of silver(I) bromide complexes with diphosphine ligands LMe, LEt, and LiPr are described, where LMe = 1,2-bis[bis(2-methylphenyl)phosphino]benzene, LEt = 1,2-bis[bis(2-ethylphenyl)phosphino]benzene, and LiPr = 1,2-bis[bis(2-isopropylphenyl)phosphino]benzene. Crystals of complex [(LMe)AgBr]2 (1), prepared from LMe and AgBr, showed a tetrahedral bimetallic structure. LEt and LiPr, with bulkier substituents than those of LMe, reacted with AgBr to give crystalline three-coordinate complexes (LEt)AgBr (2) and (LiPr)AgBr (3). Nuclear magnetic resonance (NMR) studies demonstrated that 1 dissociates in solution to yield a monomeric three-coordinate complex (LMe)AgBr. Luminescence studies showed that complexes 13 exhibit efficient blue thermally activated delayed fluorescence (TADF) in both solid state and solution. Density functional theory (DFT) / Time-dependent (TD)-DFT calculations revealed that the electronic transition responsible for TADF corresponds to (σ+Br) → π*. The photophysical properties of silver complexes 13 are discussed in detail and compared to those of the copper complex (LMe)CuBr.

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Publication details

The article was received on 07 Jul 2017, accepted on 09 Aug 2017 and first published on 09 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02460F
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Photoluminescence properties of TADF-emitting three-coordinate silver(I) halide complexes with diphosphine ligands: a comparison study with copper(I) complexes

    M. Osawa, M. Hashimoto, I. Kawata and M. Hoshino, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02460F

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