Unusual Terpyridines as Ligands for Novel Light-Emitting Iridium(iii) Complexes: Synthesis and Characterization
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Winter, Andreas; Ulbricht, Christoph; Holder, Elisabeth; Risch, Nikolaus; Schubert, Ulrich S.
- Abstract:
- Based on S-shaped terpyridines, a series of yellow, orange, and red-orange light-emitting iridium(iii) complexes
has been synthesized. The respective compounds have been prepared by the bridge-splitting method starting from
the dimeric precursor complexes [(ppy)2Ir-μ-Cl]2, [(ppy-CHO)2Ir-μ-Cl]2, and [(c6)2Ir-μ-Cl]2. The products have
been fully characterized by one- and two-dimensional (1H–1H correlation) NMR spectroscopy, elemental analysis,
and MALDI-TOF mass spectrometry revealing the successful coordination of the iridium(iii) centres to the
S-shaped terpyridine ligands. Furthermore, the quantitative coordination has been verified by the photophysical
and electrochemical properties of the mononuclear iridium(iii) complexes. The photoluminescence spectra have
shown strong emissions with maxima between 538 and 600 nm. The study of the optical properties of these novel
complexes has indicated that the colour shifts are mainly depending on the nature of the cyclometallating ligands.
- Year:
- 2006
- Type of Publication:
- Article
- Journal:
- Australian Journal of Chemistry
- Volume:
- 59
- Pages:
- 773 - 782