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Rupp, Mira; Auvray, Thomas; Rousset, Elodie; Mercier, Gabriel M; Marvaud, Valérie; Kurth, Dirk G; Hanan, Garry S
Inorganic chemistry, 07/2019, Letnik: 58, Številka: 14Journal Article
Since the initial report by Lehn et al. in 1979, ruthenium tris(bipyridine) (Ru(bpy)32+) and its numerous derivatives were applied as photosensitizers (PSs) in a large panel of photocatalytic conditions while the bis(terpyridine) analogues were disregarded because of their low quantum yields and short excited-state lifetimes. In this study, we prepared a new terpyridine ligand, 4′-(4-bromophenyl)-4,4‴:4″,4‴′-dipyridinyl- 2,2′:6′,2″-terpyridine (Bipytpy) and used it to prepare the heteroleptic complex Ru(Tolyltpy)(Bipytpy)(PF6)2 (1; Tolyltpy = 4′-tolyl-2,2′:6′,2′-terpyridine). Complex 1 exhibits enhanced photophysical properties with a higher quantum yield (7.4 × 10–4) and a longer excited-state lifetime (3.8 ns) compared to those of Ru(Tolyltpy)2(PF6)2 (3 × 10–5 and 0.74 ns, respectively). These enhanced photophysical characteristics and the potential for PS–catalyst interaction through the peripheral pyridines led us to apply the complex for visible-light-driven hydrogen evolution. The photocatalytic system based on 1 as the PS, triethanolamine as a sacrificial donor, and cobaloxime as a catalyst exhibits sustained activity over more than 10 days under blue-light irradiation (light-emitting diode centered at 450 nm). A maximum turnover number of 764 was obtained after 12 days.
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