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An efficient catalyst based on a water‐soluble cobalt(II) complex of S , S ′‐bis(2‐pyridylmethyl)‐1,2‐thiobenzene for electrochemical‐ and photochemical‐driven hydrogen evolution
Author(s) -
Xie ZhenLang,
Jiang WenXing,
Wang NanShu,
Zhan ShuZhong
Publication year - 2020
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5390
Subject(s) - chemistry , catalysis , cobalt , photocatalysis , ascorbic acid , photosensitizer , hydrogen , yield (engineering) , photochemistry , inorganic chemistry , organic chemistry , materials science , food science , metallurgy
The reaction of S , S ′‐bis(2‐pyridylmethyl)‐1,2‐thiobenzene and CoCl 2 affords a water‐soluble cobalt(II) complex, [(bptb)CoCl 2 ], which has been characterized using various methods. Under blue light, together with CdS nanorods as a photosensitizer and ascorbic acid as a sacrificial electron donor, [(bptb)CoCl 2 ] can catalyze hydrogen generation from water and can work for 90 h. Under optimal conditions, this photocatalytic system achieves a turnover number (TON) of 22 900 moles of H 2 per mole of catalyst during 60 h of irradiation, and the highest apparent quantum yield is ca 26.63% at 469 nm. Moreover, [(bptb)CoCl 2 ] exhibits much higher activity than [(bpte)CoCl 2 ] (bpte = S , S ′‐bis(2‐pyridylmethyl)‐1,2‐thioethane; TON = 6740 moles of H 2 per mole of catalyst during 60 h of irradiation), indicating that bptb can constitute a better catalyst for hydrogen production than bpte. This result can be attributed to the electronic properties of the ligands (bptb and bpte). The introduction of phenyl makes the electron distribution more uniform in the cobalt complex, allowing easier formation of the Co(III)–H species, further promoting the formation of hydrogen.