Issue 28, 2013

Cyclometalated cinchophen ligands on iridium(iii): towards water-soluble complexes with visible luminescence

Abstract

Eight cationic heteroleptic iridium(III) complexes, [Ir(epqc)2(N^N)]+, were prepared in high yield from a cyclometalated iridium bridged-chloride dimer bearing two ethyl-2-phenylquinoline-4-carboxylate (epqc) ligands. Two X-ray crystallographic studies were undertaken on selected complexes (where the ancillary ligand N^N = 4,4′-dimethyl-2,2′-bipyridine and 4,7-diphenyl-1,10-phenanthroline) each confirming the proposed formulations, showing an octahedral coordination at Ir(III). In general, the complexes are luminescent (620–630 nm) with moderately long lifetimes indicative of phosphorescence. Hydrolysis of the ethyl ester moieties of the epqc ligands gave the analogous cinchophen-based complexes, which were water-soluble and visibly luminescent (568–631 nm). The spectroscopic and redox characterisation of the complexes was complemented by DFT and TD-DFT calculations, supporting the assignment of dominant 3MLCT to the emissive character.

Graphical abstract: Cyclometalated cinchophen ligands on iridium(iii): towards water-soluble complexes with visible luminescence

Supplementary files

Article information

Article type
Paper
Submitted
26 Apr 2013
Accepted
29 May 2013
First published
06 Jun 2013
This article is Open Access
Creative Commons BY license

Dalton Trans., 2013,42, 10347-10357

Cyclometalated cinchophen ligands on iridium(III): towards water-soluble complexes with visible luminescence

R. A. Smith, E. C. Stokes, E. E. Langdon-Jones, J. A. Platts, B. M. Kariuki, A. J. Hallett and S. J. A. Pope, Dalton Trans., 2013, 42, 10347 DOI: 10.1039/C3DT51098K

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