Abstract

RAMIREZ-DELGADO, Vanessa et al. Electrochemical Behavior of Ni(II) Complexes with N₂S₂ and N₆ Ligands as Potential Catalysts in Hydrogen Evolution Reaction. J. Mex. Chem. Soc [online]. 2015, vol.59, n.4, pp.294-301. ISSN 1870-249X.

In this work, two Ni(II) complexes with the tetradentate ligand N₂S₂ (pdto=1,8-bis(2-pyridyl)-3,6-dithioctane,) and the hexa-dentate ligand N₆ (bdahp= 2,9-bis-(2',5'-diazahexanyl)-1,10-phenan-throline) were prepared in order to explore its electrochemical behavior, that indicate their potential use as molecular catalysts for the hydrogen evolution reaction. The Ni(II)-pdto complex presented two consecutive one electron transfer [Ni(II)-(pdto)] + 1e^- [Ni(I)-(pdto)] and [Ni(I)-(pdto)] + 1 e^- - Ni(0) + pdto. On the other hand the Ni(II)-bdahp complex presented the electrochemical reduction Ni(II)-(bdahp) + 1e^- Ni(I)-(bdahp) followed by a coupled chemical reaction in an ECi mechanism, where a de-coordination of the diiminic moiety of the bdahp ligand was proposed. It was demonstrated that the pdto ligand promotes reduction over Ni(II) at less negative reduction potential in comparison when the ligand bdahp is presented.

Keywords : Electrochemistry; Ni(II) complexes; N₂S₂ ligand; N₆ ligand.

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