The photophysical and electron transfer properties of the lowest excited state of nine ruthenium (polypyridine) complexes have been characterized. The complexes studied are Ru (bpy) 3‐n (LL) 2+ n , where n varies from 0 to 3, and LL is 4, 4′‐di‐ t ‐butyl‐2,2′‐bipyridine (DTB‐bpy), 3, 3′‐dimethyl‐2, 2′‐bipyridine (DM‐bpy), or a 2, 2′‐diquinolyl derivative (DMCH). The results obtained show that the Ru (bpy) 2 (DMCH) 2+ complex is expected to be a more efficient mediator than Ru (bpy) 2+ 3 in the water‐splitting reaction by solar energy.
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Juris et al. (1981) studied this question.
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