Photoluminescence properties of TADF-emitting three-coordinate silver(i) halide complexes with diphosphine ligands: a comparison study with copper(i) complexes
| Autor: | Mikio Hoshino, Masahisa Osawa, Isao Kawata, Masashi Hashimoto |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010405 organic chemistry
chemistry.chemical_element Halide 010402 general chemistry Photochemistry 01 natural sciences Copper Molecular electronic transition 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Crystallography Monomer chemistry Bromide Density functional theory Luminescence Bimetallic strip |
| Zdroj: | Dalton transactions (Cambridge, England : 2003). 46(37) |
| ISSN: | 1477-9234 |
| Popis: | 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 1-3 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 1-3 are discussed in detail and compared to those of the copper complex (LMe)CuBr. |
| Databáze: | OpenAIRE |
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