Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 4, Pages 1303-1310Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201203029
Keywords
hydrogen; iridium; photochemistry; photosensitizer; water splitting
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Funding
- National Science Foundation of China [20901038]
- National Basic Research Program of China [2013CB632400]
- Fundamental Research Funds for the Central Universities [1106021342, 1117021302]
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Two new charge-neutral iridium complexes, [Ir(tfm-ppy)2(N,N'-diisopropyl-benzamidinate)] (1) and [Ir(tfm-ppy)2(N,N'-diisopropyl-4-diethylamino-3,5-dimethyl-benzamidinate)] (2) (tfm-ppy=4-trifluoromethyl-2-phenylpyridine) containing an amidinate ligand and two phenylpyridine ligands were designed and characterised. The photophysical properties, electrochemical behaviours and emission quenching properties of these species were investigated. In concert with the cobalt catalyst [Co(bpy)3]2+, members of this new class of iridium complexes enable the photocatalytic generation of hydrogen from mixed aqueous solutions via an oxidative quenching pathway and display long-term photostability under constant illumination over 72 h; one of these species achieved a relatively high turnover number of 1880 during this time period. In the case of complex 1, the three-component homogeneous photocatalytic system proved to be more efficient than a related system containing a charged complex, [Ir(tfm-ppy)2(dtb-bpy)]+ (3, dtb-bpy=4,4'-di-tert-butyl-2,2'-dipyridyl). In combination with a rhodium complex as a water reduction catalyst, the performances of the systems using both complexes were also evaluated, and these systems exhibited a more efficient catalytic propensity for water splitting than did the cobalt-based systems that have been studied previously.
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