electrolysis oxygen 4 Article 2 Density functional calculations 2 EPR spectroscopy 2 Nitric oxide 2 Radical complexes 2 Ruthenium 2 absorption spectroscopy 2 amine 2 analytic method 2 article 2 calculation 2 carbonyl derivative 2 catalyst 2 chemical reaction 2 complex formation 2 cyanide 2 cyclic potentiometry 2 cyclopentadiene derivative 2 cytotoxicity 2 electric battery 2 electrolyte 2 electron spin resonance 2 halide 2 hydroxide 2 imine 2 ligand 2 lithium ion 2 magnetism 2