A tetra Co(ii/iii) complex with an open cubane Co₄O₄ core and square-pyramidal Co(ii) and octahedral Co(iii) centres: bifunctional electrocatalytic activity towards water splitting at neutral pH

Abstract

The reaction of 2,6-diformyl-4-methylphenol, 4-methoxybenzoylhydrazine and Co(OAc)2⸱4H2O in 1:2:2 mole ratio in methanol under aerobic conditions produced in 61% yield a tetranuclear complex having the molecular formula [CoIICoIII(-OAc)(3-OH)(-L)]2 where OAc–...

The importance of tetrel bonding interactions with carbon in two arrestive iso-structural Cd(ii)–Salen coordination complexes: a comprehensive DFT overview in crystal engineering

“…3 ). The said arrangements lead to the formation of an unusual open cubane core 71 within the complexes (Fig. S12 † ).…”

A novel cobalt(ii) acetate complex bearing lutidine ligand: a promising electrocatalyst for oxygen evolution reaction

“…was also shown in Table 2 indicating the appreciable activity of our catalyst towards OER. 34,[36][37][38][59][60][61] The electrochemical impedance spectroscopy (EIS) was performed at a potential of 1.63 V vs. RHE to determine the charge transfer parameter for complex 1. The diameter of the Nyquist plot is related to the charge transfer resistance at the electrode-electrolyte interface.…”

Rational Design of Electrocatalysts for Water Oxidation Reaction: Inspiration from Photosystem II

“…Another successful example was a mixed-valence heterogeneous catalyst attached to the electrode, namely [Co II Co III -(μÀ OAc)(μ 3 À OH)(μÀ L)] 2 (Co-12; HOAc = acetic acid, H 3 L = N', N''-(2-hydroxy-5-methyl-1,3-phenylene)bis(methan-1-yl-1ylidene)bis(4-methoxy benzoyl hydrazone)) with an open Co 4 O 4 cubane, [36] as shown in Figure 8(c). This catalyst was a dimer synthesized by the polymerization of [Co 2 (μÀ OAc)(μÀ L)] unit, in which Co III and Co II were located in the aberrant octahedral NO 5 coordination sphere and aberrant square pyramidal NO 4 coordination sphere, respectively.…”

“…Co-8 360 vs. RHE 1.5 [14] Co-9 -0.02 [8a] Co-10 354 (at a current density of 1 mA cm À 2 ) 5.23 [35] Co-11 -- [35] Co-12 -0.305 [36] Figure 9. Proposed mechanism over Cu-2 for water oxidation.…”