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-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 22 Sayı: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1007/s10895-011-0943-y
  • Dergi Adı: JOURNAL OF FLUORESCENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.163-174
  • Marmara Üniversitesi Adresli: Evet

Özet

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.