摘要:
Some new heteroleptic tris-cyclometallated iridium(III) complexes have been synthesized and fully characterized. Among these iridium(111) complexes, bi s(1-phenylpyrazolato-N, C-2')iridium(III) [5 -(2'-pyridyl) tetrazolate] (3) and bis(3-methyl-l-phenylpyrazolatoN, N,C-2')iridium(III) [5-(2'-pyridyl)tetrazo late] (4) show excellent quantum yields at room temperature, the electron density being perturbed by introducing the pyridyltetrazole ligand, making k(r) > k(nr). This destroys the concept of phenylpyrazole based iridium complexes. (C) 2007 Elsevier Ltd. All rights reserved.