Luminescent Heteroleptic Tris(dipyrrinato)indium(III) Complexes

To provide an improvement over the low fluorescence efficiencies often shown by homoleptic tris­(dipyrrinato)­indium­(III) complexes, luminescent heteroleptic tris­(dipyrrinato)­indium­(III) complexes bearing two types of dipyrrinato ligands are designed here by theoretical calculation and then synthesized. They possess frontier orbitals linked to suppression of the nonemissive charge-separated states; one shows a high fluorescence quantum yield (0.41) in toluene, which exceeds that of the corresponding BF2 complex.