Aqueous platinum nanoparticles solution for the detection of pyridine derivatives of aminophosphinic acid. Influence of positional isomerism

Abstract

Unsupported platinum nanoparticles (PtNPs) (∼12nm in diameter) were synthetized by the polyol method and ultraviolet-visible spectroscopy (UV–vis), scanning electron microscope (SEM), and X-ray powder diffraction (XRD) characteristic of their agglomerates were examined. Then, three pyridine α−aminophosphinic acid isomers (α–, β–, and γ–) were synthetized and assembled on the surface of PtNPs. Differences in adsorption and thus, in the spectral response resulting from positional isomerism, were checked by surface-enhanced Raman scattering (SERS) at 785nm excitation wavelength. The manner of interaction of the investigated isomers with PtNPs were discussed and compared. General conclusions were drowned.