Photophysical and Analyte Sensing Properties of Cyclometalated Ir(III) Complexes

Leavens B. B. H. , Trindle C. O. , Sabat M., ALTUN Z. , Demas J. N. , DeGraff B. A.

JOURNAL OF FLUORESCENCE, cilt.22, sa.1, ss.163-174, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 22 Konu: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1007/s10895-011-0943-y
  • Sayfa Sayıları: ss.163-174


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.