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Gold nanoparticles (AuNPs−) were synthesized through the reduction of HAuCl4 with a solution of sodium citrate 1%, getting negatively charged species. [RuIICl(dppb)(bipy)(py)](PF6) and [RuIIICl2(dppb)(phen)](PF6) were also synthesized as monocationic species (Ru+), where dppb = 1,4-bis(diphenylphosphino)butane, bipy = 2,2′-bipyridine, phen = 1,10-phenantroline and py = pyridine. Aggregates of AuNPs− with negatively charged and with a cationic complex containing ruthenium (II) and (III) were obtained by means of electrostatic interactions. The AuNPs− and aggregates (Ru–AuNPs) were analyzed by ultraviolet/visible spectroscopy (UV–Vis), Fourier transform infrared spectroscopy–attenuated total reflectance (FTIR–ATR), nuclear magnetic resonance of phosphorous (31P{1H} NMR), cyclic voltammetry (CV) and field emission scanning electron microscopy (FE-SEM). The AuNPs− and the Ru–AuNPs were used as modifiers in the preparation of carbon paste electrodes and their performance were evaluated by cyclic voltammetry to determination of acetaminophen. |
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