期刊
DALTON TRANSACTIONS
卷 42, 期 28, 页码 10347-10357出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3dt51098k
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资金
- Cardiff University
- EPSRC
Eight cationic heteroleptic iridium(III) complexes, [Ir(epqc)(2)(N boolean AND 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 boolean AND 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 (MLCT)-M-3 to the emissive character.
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