The Front Cover shows the combination of an electron transfer mediated anode for [(2,2,6,6-tetramethyl-1-piperidin-1-yl)oxyl] (TEMPO)-catalysed benzylamine oxidation to valuable chemicals and proton-coupled electron transfer process at the...
Substituent Effect on Ligand‐Centered Electrocatalytic Hydrogen Evolution of Phosphorus Corroles
Von Wiley-VCH zur Verfügung gestellt
Electrocatalytic hydrogen: The substituent effect on the ligand-centered electrocatalytic hydrogen evolution reaction (HER) of phosphorus corroles in homogeneous system had been investigated by experimental and DFT calculation. The HER activity significantly increases with the decreasing number of electron-drawing fluorine atoms at the meso-aryl substituents.
There have been few reports on the substituent effect of main-group-element corrole complexes as ligand-centered homogeneous electrocatalysts for the hydrogen evolution reaction (HER). The key to comprehend the catalytic mechanism and develop efficient catalysts is the elucidation of the effects of electronic structure on the performance of energy-related small molecules. In this work, the “push-pull” electronic effect of the substituents on electrocatalytic HER of phosphorus corroles was investigated by using 5,10,15-tris(phenyl) corrole phosphorus (1P), 10-pentafluorophenyl-5,15-bis(phenyl) corrole phosphorus (2P), 10-phenyl-5,15-bis(pentafluorophenyl) corrole phosphorus (3P), 5,10,15-tris(pentafluorophenyl) corrole phosphorus (4P) complexes bearing hydroxyl axial ligands and different numbers of fluorine atoms on the meso-aryl substituents. The results revealed that the catalytic HER activity of phosphorus corroles decreased with the increasing of fluorine atom numbers, it follows in the order 1P>2P>3P>4P. Density functional theory (DFT) calculations show that the corrole 1P has the lowest free energy barrier in catalytic HER.Zum Volltext
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