Effects of metal centers of complexes supported by S,S′‐bis(2‐pyridylmethyl)‐1,2‐thioethane on catalytic activities for electrochemical‐ and photochemical‐driven hydrogen production

• Published in: Applied organometallic chemistry Vol. 34; no. 9
• Main Authors: Liu, Wei‐Xia, Xie, Zhen‐Lang, Wang, Chun‐Li, Zhan, Shu‐Zhong, Wu, Song‐Ping
• Format: Journal Article
• Language: English
• Published: Chichester Wiley Subscription Services, Inc 01.09.2020
• Subjects: Aqueous solutions; Ascorbic acid; Catalysts; Chemistry; Coordination compounds; Electrolysis; electro‐ and photo‐catalysts; Hydrogen production; Iron; M(II) complexes (M = cobalt, iron, and nickel); Metals; Nickel; Photolysis; proton and water reduction to dihydrogen; Reduction (electrolytic)
• ISSN: 0268-2605; 1099-0739
• DOI: 10.1002/aoc.5776

S,S′‐bis(2‐pyridylmethyl)‐1,2‐thioethane (bpte) reacts with MCl2 (M = Co, Ni, and Fe) to give three complexes, namely, [CoII(bpte)Cl2] (1), [NiII(bpte)Cl2] (2), and [FeII(bpte)Cl2] (3), respectively. They all act as catalysts for proton or water reduction to dihydrogen via electrolysis or photolysis. Under an overpotential of 837.6 mV, the electrolysis of a neutral buffer with complex 1, 2, or 3 can provide 418 (±3), 555 (±3), and 243 (±3) moles of hydrogen per mole of catalyst per hour (mol H2/mol catalyst/h), respectively. Under blue light, together with a photosensitizer and ascorbic acid (H2A) as a sacrificial electron donor, the photolysis of an aqueous solution (pH 4.5) containing complex 1, 2, or 3 can afford 9060 (±5), 24,900 (±5), and 10,630 (±5) moles H2 per mole of catalyst (mol of H2 [mol of cat]−1) during 83‐h irradiation with an average apparent quantum yield of 7.1%, 24%, and 10%, respectively. The results show that the nickel complex [NiII(bpte)Cl2] exhibits a more efficient activity for hydrogen generation than the iron or cobalt species. These findings may offer a new chemical paradigm for the design of efficient catalysts. Reactions of S,S'‐bis(2‐pyridylmethyl)‐1,2‐thioethane(bpte) with MIICl2 (M=Co, Ni and Fe) afford three complexes, [CoII(bpte)Cl2], [NiII(bpte)Cl2] and [FeII(bpte)Cl2], respectively. They all can act as catalysts for hydrogen evolution. [NiII(bpte)Cl2] exhibits a higher catalytic efficiency for hydrogen production than [CoII(bpte)Cl2] or [FeII(bpte)Cl2].