title: Photophysical and analyte sensing properties of cyclometalated Ir(III) complexes.
abstract: The synthesis of some heteroleptic, cyclometalated iridium(III) complexes is described. The utility of these [Ir(ppy)(2)(N-N)]Cl (ppy = 2-phenylpyridine and N-N = substituted bipyridine, biquinoline, or phenanthroline) complexes as luminescence-based sensors is assessed. The emission intensity of an Ir(III) complex featuring the 3,3'-H(n)dcbpy ligand (H(n)dcbpy = dicarboxylic acid-2,2'-bipyridine; n = 0,1,2 to indicate deprotonated, mono- and diprotonated species, respectively) is seen to increase in the presence of Pb(II). Insight into the structure and analyte-sensing capability is achieved by X-ray crystallography in conjunction with computational modeling. Complexes incorporating carboxylic acid-functionalized bipyridine and biquinoline as the polypyridyl ligand show pH sensitivity while similar phenanthroline complexes do not.
authors.affiliation: Chemistry Department, University of Virginia, Charlottesville, VA 22904, USA.
authors.forename: Bethany B H
authors.initials: BB
authors.lastname: Leavens
authors.forename: Carl O
authors.initials: CO
authors.lastname: Trindle
authors.forename: Michal
authors.initials: M
authors.lastname: Sabat
authors.forename: Zikri
authors.initials: Z
authors.lastname: Altun
authors.forename: James N
authors.initials: JN
authors.lastname: Demas
authors.forename: B A
authors.initials: BA
authors.lastname: DeGraff