Mononuclear nickel complexes with pentadentate ligand, N,N-bis(2-pyridinylmethyl)-2,2'-bipyridine-6-methanamine (DPA-Bpy), [Ni(DPA-Bpy)(CH3CN)](BF4)2 and [Ni(DPA-Bpy)(H2O)](BF4)2, have been synthesized, characterized, and examined for the activity towards H2 evolution. 1H NMR and magnetic moment studies confirmed that both complexes contain a high-spin paramagnetic NiII center. Complex [Ni(DPA-Bpy)(H2O)](BF4)2 demonstrates efficient and robust activity for electro- and photocatalytic H2 production. In a homogeneous system containing fluorescein as organic photosensitizer and triethylamine as electron donor, a total turnover number of 10,900 moles H2 (mol cat)-1 is achieved for [Ni(DPA-Bpy)(H2O)](BF4)2 during 90 h photolysis under visible light irradiation. Both electrochemical and computational studies suggest catalytic H2 production may occur through a Ni0 species for proton binding and reduction.

Mononuclear nickel polypyridine complex as robust electro- and photocatalyst for H<sub>2</sub> production

246th National Meeting (2013)

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Mononuclear nickel polypyridine complex as robust electro- and photocatalyst for H2 production

Mononuclear nickel polypyridine complex as robust electro- and photocatalyst for H₂ production