Strategic modulation of the photonic properties of conjugated organometallic Pt–Ir polymers exhibiting hybrid CT-excited states

Ahmed M. Soliman, Eli Zysman-Colman, Pierre D. Harvey

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
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Abstract

Polymer 6, ([trans-Pt(PBu3)2(C≡C)2]-[Ir(dFMeppy)2(N^N)](PF6))n, (([Pt]-[Ir](PF6))n; N^N = 5,5′-disubstituted-2,2′-bipyridyl; dFMeppy = 2-(2,4-difluoro-phenyl)-5-methylpyridine) is prepared along with model compounds. These complexes are investigated by absorption and emission spectroscopy and their photophysical and electrochemical properties are measured and compared with their corresponding non fluorinated complexes. Density functional theory (DFT) and time-dependent DFT computations corroborate the nature of the excited state as being a hybrid between the metal-to-ligand charge transfer (1,3MLCT) for the trans-Pt(PBu3)2(C≡CAr)2 unit, [Pt] and the metal-to-ligand/ligand-to-ligand′ charge transfer (1,3ML′CT/LL′CT) for [Ir] with L = dFMeppy. Overall, the fluorination of the phenylpyridine group expectedly does not change the nature of the excited state but desirably induces a small blue shift of the absorption and emission bands along a slight decrease in emission quantum yields and lifetimes.

Original languageEnglish
Number of pages6
JournalMacromolecular Rapid Communications
VolumeEarly view
Early online date27 Nov 2014
DOIs
Publication statusPublished - 2014

Keywords

  • Conjugated polymers
  • Electrochemistry
  • Iridium(III)
  • Luminescence
  • Platinum(II)

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