期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 2013, 期 25, 页码 4421-4429出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201300583
关键词
N ligands; Panchromic absorbers; Iridium; Structure-activity relationships; Optoelectronic properties
资金
- Canadian Foundation for Innovation (CFI)
- National Sciences and Engineering Research Council of Canada (NSERC)
- Le Fonds quebecois de la recherche sur la nature et les technologies (FQRNT)
- Universite de Sherbrooke
A family of cationic heteroleptic iridium(III) complexes of the form [Ir(ppy)(2)(Ar-BIAN)]PF6 (ppyH = 2-phenylpyridine) in which Ar-BIAN [bis(arylimino)acenaphthene] acts as an ancillary ligand were synthesized and characterized. Their ground-state electronic structures were probed by UV/Vis spectroscopy and cyclic voltammetry. The X-ray structure of [Ir(ppy)(2)(4-MeO2CPh-BIAN)]PF6 was solved. The first and second reduction wave potentials are strongly influenced by the substituent on the Ar-BIAN ligand and follow a Hammett relationship. The absorption spectra for complexes incorporating an electron-donating Ar-BIAN ligand are noticeably redshifted, and absorption tails off past 800 nm. Notably, the absorption spectrum for [Ir(ppy)(2)(4-NMe2Ph-BIAN)]PF6 shows an intense band centered at 576 nm, and it was assigned computationally to a mixed metal-to-ligand charge-transfer/ligand-to-ligand charge-transfer state.
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