Unusual Terpyridines as Ligands for Novel Light-Emitting Iridium(III) Complexes: Synthesis and Characterization

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Contents Vol 59(11)

doi:10.1071/CH06281

Unusual Terpyridines as Ligands for Novel Light-Emitting Iridium(iii) Complexes: Synthesis and Characterization

Andreas Winter ^A, Christoph Ulbricht ^A, Elisabeth Holder ^A ^C, Nikolaus Risch ^B, Ulrich S. Schubert ^A ^D

^A Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology & Dutch Polymer Institute, 5600 MB Eindhoven, The Netherlands.
^B Chemistry Department, Faculty of Science, Paderborn University, 33098 Paderborn, Germany.
^C Current address: Functional Polymers Group & Institute of Polymer Technology, University of Wuppertal, 42097 Wuppertal, Germany.
^D Corresponding author. Email: u.s.schubert@tue.nl





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Australian Journal of Chemistry 59(11) 773–782 http://dx.doi.org/10.1071/CH06281
Submitted: 5 August 2006 Accepted: 27 September 2006 Published online: 17 November 2006

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.