Electrochemical Water Oxidation Catalyzed by N₄‐Coordinate Copper Complexes with Different Backbones: Insight into the Structure‐Activity Relationship of Copper Catalysts

Copper complexes with a general formula of [(L)Cu(OH 2 )](BF 4 ) 2 ( 1 , L1= N,N′ ‐dimethyl‐ N,N′ ‐bis(pyridin‐2‐ylmethyl)‐1,2‐diaminoethane; 2 , L2= N,N′ ‐bis(pyridin‐2‐ylmethyl)piperazine); 3 , L3= N,N′ ‐bis(pyridin‐2‐ylmethyl)diazepane) were prepared as molecular catalysts for oxygen evolution reaction. These catalysts have the same first coordination environment but different backbones of diamine‐dipyridine N 4 ‐ligands. Single crystal X‐ray...