Journal
DALTON TRANSACTIONS
Volume 46, Issue 47, Pages 16455-16464Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7dt02666h
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- University of Padova (Progetto Attrezzature Scientifiche finalizzate alla Ricerca) [PRAT CPDA CPDA153122]
- Fondazione Cassa di Risparmio di Padova e Rovigo (Dottorati Internazionali)
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Novel cobalt, nickel, and iron complexes based on the pentadentate 8-hydroxyquinoline-di(2-picolyl) amine ligand were synthesized and thoroughly characterized. X-ray structures of both the cobalt and iron complexes were also obtained, showing the tendency to adopt a pseudo-octahedral geometry by coordination of an additional sixth ligand. These metal complexes were then studied as potential hydrogen-evolving catalysts (HECs) under both electrochemical and light-driven conditions. In particular, two different photochemical systems were tested involving either Ru(bpy)(3)(2+)/ascorbic acid or Ir(ppy)(2)(bpy)(+)/ TEA sensitizer/sacrificial donor couples. The electrochemical results showed that these metal complexes may behave as competent HECs. However, under photochemical conditions, only the cobalt compound displayed substantial hydrogen-evolving activity in both ruthenium-and iridium-based systems. The nickel and iron complexes, on the other hand, exhibited appreciable photocatalytic activity only in the iridium-based photochemical system, while showing negligible hydrogen evolution ability when employed in the ruthenium-based one.
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