The Ag(I) complex with o-bis(diphenylphosphino)benzene shows reversible interconversion between blue-emitting (1b) and green-emitting (1g) materials on grinding and heating; comparison of the structure of 1b with another green-emitting crystals (2) having the same formula suggests the chromism results from intermolecular interactions between adjacent phenylene rings.

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Mixed-ligand Cu(I) complexes have attracted attention as alternatives to the noble-and/or rare-metal complexes, because of their remarkable photofunctions. To develop mixedligand Cu(I) complexes with rich photofunctions, an investigation of a suitable combination of ligands has captured more and more research interests. Herein, we report the first examples of emissive heteroleptic diphosphine-disulfide Cu(I) complexes combined with diphosphine ligands. The systematic study using a series of diphosphine ligands revealed that large π-conjugated bridging moieties between the two P atoms in the diphosphine ligands result in higher light-emission performance. When the diphosphine ligand w a s ( R ) -B I N A P ( ( R ) -B I N A P = ( R ) -( + ) -2 , 2 ′ -b i s -(diphenylphosphino)-1,1′-binaphthyl), the Cu(I) complex had an emission quantum yield (Φ em ) of 0.13 and a long emission lifetime (τ em = 118 μs).

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