Abstract
A new molecular catalyst based on a tetra-nuclear copper(I), [CuI4(L)4] 1 is prepared by the reaction of the triazenido ligand, [1,3-bis(2-methoxy)benzene]triazene (HL) with CuCl. X-ray structural studies show that four copper atoms are triazenido-bridged with four independent Cu⋯Cu distances of 2.5881(7)–2.6048(7)Å. Complex 1 can act as an electrocatalyst for hydrogen generation with 170.66mol of hydrogen per mole of catalyst per hour (molh−1) from acetic acid at an overpotential (OP) of 991.6mV and 1034.31molh−1 from a neutral aqueous buffer (pH 7.0) at an OP of 837.6mV, respectively. To test that the triazenido ligand, HL, plays a role in the electrocatalytic system, electrocatalytic activities of HL, CuCl and 1 are each investigated, and a possible catalytic mechanism for hydrogen generation catalyzed by 1 is provided.
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