Cover Feature: Ligand Substituent Effects on Light‐Driven Hydrogen Evolution by Cobalt(II) Tripodal Iminopyridine Catalysts under Precious‐Metal‐Free Conditions (Eur. J. Inorg. Chem. 31/2022)

The Cover Feature shows light-driven hydrogen evolution mediated by cobalt(II) tripodal iminopyridine complexes, using tri(n-butyl)triazatriagulenium (TATA+) as the organic sensitizer and triethylamine (TEA) sacrificial donor in aqueous acetonitrile. activity of complexes depends highly on electronic properties substituents pyridine moieties. Under acidified conditions, for H2 production was enhanced substituted catalysts. 5-Cl derivative showed higher lower catalytic potential (Ecat), which can be attributed to stabilized CoI, favorable formation CoIII(H). improved productivity Ecat 5-CH3O, 6-CH3O, 5-CH3 derivatives are suggested associated with increased electron density CoIII(H) intermediate, is more susceptible protonation. More information found Research Article J. Xiang, C.-F. Leung, C.-C. Ko co-workers.