Electrocatalytic hydrogen evolution upon reduction of pyridoxal semicarbazone and thiosemicarbazone-based Cu(II) complexes

Abstract

The growing global demand for renewable energy sources has pushed renewable, green energy sources to the forefront, among which the production of hydrogen gas from water occupies a significant place. To realize this goal, researchers across the globe are developing various systems that could swiftly catalyse the hydrogen evolution reaction (HER) in the highest possible yield. In the present work, we report electrocatalytic HER performances of pyridoxal semicarbazone- and thiosemicarbazone-based Cu(II) complexes, i.e. ([Cu(PLSC)Cl2] and [Cu(PLTSC-H)H2O]Br?H2O). We unambiguously demonstrated that the complexes exhibit enviable level of HER catalytic activity. The catalytic activity of the complexes was not only the function of central metal but it was also controlled by the nature of the coordinating ligand.

Crystallographic Structure and Quantum-Chemical Analysis of Biologically Active Co(III)-Pyridoxal–Isothiosemicarbazone Complex

“…The complexes have shown promising antitumor, antiviral, and inflammatory activities, in some cases higher than that of cisplatin [15]. Their pote use as materials for electrocatalytic hydrogen evolution has also been proven [16] second largest group of PLITSC-containing compounds has iron as a central metal io in Fe(PLITSC)Cl3 × H2O, Fe(PLITSC)(PLITSC-H)](NO3)2 × H2O, [Fe(PLITSC)(PLIT H)]SO4 × 2H2O [14], Fe(PLITSC)Cl3 × H2O, Fe(PLITSC)(PLITSC-H)](NO3)2 × H2O, [Fe(PLITSC)(PLITSC-H)]SO4 × 2H2O [9]. Cobalt, nickel, and other metal ions also e coordinate with the mentioned ligand, some examples are Co(PLITSC-2H)(PLITSC-CH3OH [17];…”

“…[Co(PLITSC-H)2]BrNO3×CH3OH [18], Co [20]. Over the past decade good catalytic properties of transition metal complexes with derivatives of pyrid carbazone as ligands have been studied [16,[21][22][23][24][25].…”

“…The complexes have shown promising antitumor, antiviral, and anti-inflammatory activities, in some cases higher than that of cisplatin [15]. Their potential use as materials for electrocatalytic hydrogen evolution has also been proven [16]. The second largest group of PLITSC-containing compounds has iron as a central metal ion, as in Fe(PLITSC)…”

Synthesis, Crystal Structure, Quantum Chemical Analysis, Electrochemical Behavior, and Antibacterial and Photocatalytic Activity of Co Complex with Pyridoxal-(S-Methyl)-isothiosemicarbazone Ligand

“…The coordination compounds with CuII are interesting because of the biological relevance of copper as an essential ion and antiviral, antitumor, and anti-inflammatory activity of these systems [ 15 ]. It has been shown that Cu complexes with pyridoxal semicarbazones and PLITSC can be used as a promising material for electrocatalytic hydrogen evolution [ 16 ]. The Cu complexes with morpholine–thiosemicarbazone hybrids specifically inhibited the growth of S. aureus with MIC value of 2–5 μg mL −1 and accumulated in the cancer cells through ribonucleotide reductase inhibition [ 17 ].…”

“…The Zn and Cu complexes of the same ligand manifested high antibacterial activity [ 27 ]. In the last decade, several papers describing the good catalytic properties of the transition metal complexes with pyridoxal-carbazone [ 16 , 28 , 29 , 30 , 31 , 32 , 33 ] have been published.…”