The bidentate (HL) Schiff base was synthesized by reacting 2-hydroxy-1-naphthaldehyde with 4-aminophenol in absolute ethanol. The resulting HL ligand was also coordinated with the manganese ions to obtain Mn(III) complex [Mn(III)L 2 ClPy (Py=pyridine)]. This Schiff base and its manganese(III) complex were characterized by multiple and usual methods including the 1 H NMR,
13C NMR, elemental analysis (EA), FT-IR, UV-Vis, mass spectroscopy (MS), XRD, XPS and cyclic voltametry (CV). It was found that the ligand acts as a bidentate chelate. It coordinates with azomethine nitrogen and phenoxide oxygen. The other coordination sites, they are occupied by a chloride anion and a pyridine molecule completing the formation of Mn(III) Schiff base complex which is symbolized as Mn(III)L 2 ClPy. Conductance values measured indicate that these compounds do not possess an electrolytic character. The electrochemical behavior of the (HL) ligand and its manganese(III) complex have been investigated using a glassy carbon electrode in the presence of 0.1 M Bu 4 NClO 4 solution as a supporting electrolyte in dimethylformamide (DMF) solution. The redox system of manganese(III) complex seems to be consistent with a quasi-reversible system involving a mono electronic transfer (Mn III /Mn II ). Both compounds, HL ligand and its Mn(III) complex were as well tested in biological activity. The obtained results indicate that they exhibit no antifungal activity but have moderate antibacterial activity towards the same organism studied. Also it is noted that this compounds have high DPPH radical-scavenging activity.
En el presente trabajo se presenta el estudio del comportamiento de electrodos de SnO, dopado con antimonio, Ti/SnO₂-Sb y dopado con antimonio y platino, Ti/SnO,- Sb-Pt, así como del electrodo Co O, todos sobre soporte de titanio para su empleo enla electrooxidación de cianuro. Los electrodos fueron caracterizados por Microscopía electrónica de barrido (SEM), EDX y voltametría cíclica. Se ha evaluado el tiempo de vida útil de los electrodos en condiciones galvanostáticas, la densidad de corriente empleada fue de 100 mA/cm². La electrooxidación de cianuro fue realizada en células tipo filtro prensa empleando densidades de corriente de 5 y 25 mA/cm².
Se han preparado películas de óxido de cobalto (Co3O4) y óxido del cobalto dopados con cobre de fórmula CuxCo3-xO4 soportados sobre titanio empleado el método de descomposición térmica. Los electrodos fueron caraterizados por Microscopía Electrónica de barrido (SEM), Voltametría cíclica (VC) y Espectroscopía Fotoelectrónica de Rayos X (XPS), determinando que los óxidos de esppinela Cu-Co tienen estructura monofásica cuando x d>>1.0, sin embargo, cuando el contenido de cobre excede la relación estequimétrica de la cobalita de cobre, CuCo2O4 se forma una nueva especie identificada como CuO el cual aparece segregado en la superficie. La distribución de los cationes de cobre en la espinela, indica que el Cu(II) se ubica preferencialmente en los sitios octaédricos de mayor actividad electroquímica.
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