Local fluorine environments in nanoscopic magnesium hydr(oxide) fluorides studied by 19F MAS NMR

19F MAS NMR signals of a variety of X-ray amorphous magnesium hydroxide (oxide) fluorides (MgFx(OH(R))2−x (0 < x ≤ 2)) prepared using different synthesis routes are compared and assigned. Relations between their 19F signal positions and local coordinations are elaborated on the basis of the chemical behaviour and data available for the few crystalline reference compounds known so far. Supported by the superposition model, 19F signals appearing between −150 ppm and −200 ppm were subdivided into three groups due to local [FMg6], [FMg5] and [FMg4], and [FMg3] environments, respectively.

Fluorine environments in magnesium hydroxide (oxide) fluorides.Figure optionsDownload as PowerPoint slideHighlights
► X-ray amorphous magnesium hydroxide (oxide) fluorides (MgFx(OH(R))2−x (0 < x ≤ 2)) were studied by 19F MAS NMR.
► Relations between 19F signal positions and local coordinations are elaborated.
► 19F signals appearing between −150 ppm and −200 ppm were subdivided into three main groups due to local [FMg6], [FMg5] and [FMg4], and [FMg3] environments, respectively.