A ONE-POT SOLID-STATE SYNTHESIS OF MGO NANOPARTICLES AND THEIR CATALYTIC, BIOLOGICAL, AND ELECTROCHEMICAL SENSOR ACTIVITIES: HEXAAQUAMAGNESIUM (II) BIS (6-OXO-1,6-DIHYDROPYRIDINE-3-CARBOXYLATE) AS A TOOL

Abstract

A new divalent Mg complex, hexaaquamagnesium(II) bis(6-oxo-1,6-dihydropyridine-3-carboxylate) ([Mg(H2O)6](C6H4NO3)2) (1), was synthesized by reacting Mg(NO3)2·6H2O with 6-hydroxypyridine-3-carboxylic acid (6-hpca) in the presence of aminoguanidine bicarbonate. Here, 1 was studied by elemental, infrared (IR), 1H NMR, 13C NMR, ultraviolet-visible (UV-vis), thermal, and single-crystal X-ray diffraction (SC-XRD) analyses. We discovered that 1 crystallized in the triclinic P[1 with combining macron] space group, whereas the Mg(II) ion exhibited six coordinated water molecules with octahedral geometry. Interestingly, 1 was used as a solid-state precursor for synthesizing Mg oxide (MgO) nanoparticles (NPs). Fourier transform infrared (FT-IR), UV-vis, powder-XRD, TEM, and energy-dispersive X-ray spectroscopic analyses were performed on the prepared MgO NPs. The results showed that the as-prepared MgO NPs were small (14 nm) and homogeneous. The antibacterial activity and antioxidant scavenging assays of 6-hpca, 1, and the MgO NPs against 2,2-diphenyl-1-picrylhydrazyl (DPPH) revealed that the MgO NPs had good biological properties. Furthermore, a sensitive electrochemical sensor was developed for improved glucose detection by modifying a glassy carbon electrode with the as-prepared MgO NPs. The MgO NPs demonstrated effective catalytic properties for the reduction of 4-nitrophenol to 4-aminophenol. The proposed approach is simple, environmentally friendly, and user-friendly.