Light-Driven Proton Reduction in Aqueous Medium Catalyzed by a Family of Cobalt Complexes with Tetradentate Polypyridine-Type Ligands.
作者： Lianpeng Tong , Andrew Kopecky , Ruifa Zong , Kevin J. Gagnon , Mårten S. G. Ahlquist
DOI: 10.1021/ACS.INORGCHEM.5B00915
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摘要: A series of tetradentate 2,2′:6′,2″:6″,2‴-quaterpyridine-type ligands related to ppq (ppq = 8-(1″,10″-phenanthrol-2″-yl)-2-(pyrid-2′-yl)quinoline) have been synthesized. One ligand replaces the 1,10-phenanthroline (phen) moiety with 2,2′-bipyridine and other two a 3,3′-polymethylene subunit bridging quinoline pyridine. The structural result is that both planarity flexibility are modified. Co(II) complexes prepared characterized by ultraviolet–visible light (UV-vis) mass spectroscopy, cyclic voltammetry, X-ray analysis. light-driven H2-evolving activity these Co was evaluated under homogeneous aqueous conditions using [Ru(bpy)3]2+ as photosensitizer, ascorbic acid sacrificial electron donor, blue light-emitting diode (LED) source. At pH 4.5, all three plus [Co(ppq)Cl2] showed fastest rate, dimethylene-bridged system giving highest turnover frequency (2125 h–1). Cycli...
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