Different molecular packing structures in the solid-state iridium(III) complex (1) induce unprecedented dual phosphorescent emission through 3M(LLLL)CT and 3M(LL)CT transitions.

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Novel iridium(III)/iridium(III) and iridium(III)/platinum(II) dinuclear complexes, [{Ir(ppyFF) 2 } 2 (µ 2 -L)] (4) and [{Ir(ppyFF) , linked by an L bridging ligand were prepared, and their photophysical properties were investigated in solution and in the solid state. The photophysical properties of mononuclear iridium(III) and platinum(II) complexes, [Ir(ppyFF) 2 (dbm)] (1) and [Pt(ppy)(dbm)] (2) bearing a dibenzoylmethane (dbm) ligand were also compared. Whereas the UV/Vis absorption spectra of 4 and 5 show independent light absorption at each metal-centered moiety, the photoluminescence spectra of 4 and 5 display almost identical features, but very weak emissions in solution at both room temperature and 77 K. The weak emission in solution is found to mainly originate from a 3 LX state of the L bridging ligand,

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