Water soluble Ir(III) complexes from sulfonate-modified cyclometalating ligand

摘要

Five cyclometalated Ir(III) complexes are synthesized from a sulfonate-modified bis-benzimidazole-type organic ligand (3,3'-(2,2'-(1,3-phenylene)bis(1H-benzo [d]imidazole-2,1-diyl))dipropane-1-sulfonic acid, MBS) with different ancillary ligands, and can be classified into two categories. Namely, complexes 1 and 2 (MBS-Ir-ppy and MBS-Ir-Fppy), which are electroneutral, and complexes 3-5 (MBS-Ir-bpy, MBS-Ir-Mebpy, and MBS-Ir-bpyCOOEt), which are cationic and soluble in water. These Ir(III) complexes show tunable luminescence from cyan to orangish red color in solution and yellowish red to pure red color in solid state, with moderately long lifetime (56-528 ns) and high quantum yield (35-71%). (C) 2017 Elsevier B.V. All rights reserved.