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Ruthenium(II) Pincer Complex Bearing N′NN′‐ and ONO‐Type Ligands as a Titania Sensitizer for Efficient and Stable Visible‐Light‐Driven Hydrogen Production
Author(s) -
Zhuang Chuangsheng,
Wang Jinming,
Zhou Shengyin,
Peng Tianyou,
Zhang Jing
Publication year - 2018
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.201800009
Subject(s) - ruthenium , photochemistry , chemistry , visible spectrum , pincer movement , ligand (biochemistry) , quantum yield , photocatalysis , artificial photosynthesis , formate , catalysis , fluorescence , materials science , organic chemistry , biochemistry , receptor , physics , optoelectronics , quantum mechanics
Abstract A ruthenium(II) pincer complex [Ru(N′NN′)(ONO)] bearing a pyridinyl‐based ligand (N′NN′=2,6‐bis(N‐benzyl‐benzimidazol‐2‐yl)pyridine) and a quinolinyl‐based ligand (ONO=2,6‐dihydroxyquiniline −2‐carboxylic) is used as a sensitizer of TiO 2 nanoparticles for photocatalytic H 2 production. Due to the π‐delocalized conjugation systems of pyridinyl‐based N′NN′ and quinolinyl‐based ONO ligands, the Ru(II) pincer complex on TiO 2 nanoparticles is demonstrated as an effective sensitizer with suitable redox properties and broad visible‐light absorption, thus facilitating highly efficient and stable visible‐light‐driven H 2 production. Under optimized photoreaction conditions, Ru(N′NN′)(ONO)/Pt‐TiO 2 achieves an apparent quantum yield (AQY) of 27.3 % at 420 nm monochromatic light irradiation and a turnover number (TON) of 2166 h −1 under λ ≥420 nm light irradiation. This work exhibits that Ru(II) pincer complexes may have promising application in dye‐sensitized semiconductors for extending the spectral response range, and provides some suggestions for designing new Ru(II) complexes to effectively promote solar energy conversion into chemical energy.