Electrochemical water oxidation catalyzed by a mononuclear cobalt complex of a pentadentate ligand: the critical effect of the borate anion

Abstract

Electrochemical water oxidation catalyzed by a cobalt complex, [Co(N3Py2)(H2O)] (ClO4)2 (1) (N3Py2 = 2,5,8-trimethyl-1,9-bis(2-pyridyl)-2,5,8-triazanonane) is reported. The release of dioxygen (O2) occurs with moderate onset overpotential of 540 mV and...

Homogeneous electrochemical water oxidation catalyzed by cobalt complexes with an amine–pyridine ligand

“…The six-coordinated structure of complex 2 comprised five N atoms from N3Py2 and one O atom from coordinated water molecules, as has been confirmed in our previous work. 33 Complex [Zn(N3Py2)(OH 2 )](ClO 4 ) 2 with a six-coordinated Zn II center is isostructural to 2 with a tetragonal biconical configuration (Tables S2, S4 and Fig. S2†).…”

“…Ligands N2Py3 and N3Py2 were synthesized according to the literature. [31][32][33] The synthetic method of the complexes is as follows.…”

Electrochemical water oxidation using a stable water-soluble mononuclear manganese clathrochelate

“…Therefore, complex 1 participates in the water oxidation catalysis via a single-site catalytic mechanism. 15,18 As complex 1 is a mononuclear complex, it is supposed that 1 operates via a mononuclear water nucleophilic attack mechanism.…”

“…Numerous first row transition metal complexes have been developed for electrochemical water oxidation catalysis in the past decades. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] However, most of these complexes are based on nickel and copper as they usually exhibit satisfactory efficiency for water oxidation with moderate overpotential. Inspired by the natural oxygen evolution center Mn 4 CaO 5 cluster that exhibits ultrahigh catalytic activity for water oxidation in the photosynthesis of plant and algae, 25 Mn based homogeneous WOCs have been attracting increased attention in recent years.…”

Modulating the electrocatalytic activity of mononuclear nickel complexes toward water oxidation by tertiary amine group

“…This site is an accessible site for nucleophilic attack of water as well as a site for O-O bond formation. 19 For the absorption spectra of complexes 1-3 in phosphate buffer solution (PBS) at pH 9.0, the bands at around 500-600 nm and 800-900 nm are attributed to 3 A 2g (F) → 3 T 1g (F) and 3 A 2g (F) → 3 T 2g (F) transitions, respectively (Fig. S3 †).…”