Abstract
Abstract A new fluorinated gallium phosphate was synthesized from a quasi-non-aqueous medium using ethylene glycol as solvent and the bulky amine 4-amino-2,2,6,6-tetramethylpiperidine as organic template. This material was characterized by elemental analysis, X-ray diffraction and solid state NMR spectroscopy. The crystal structure was determined by single crystal X-ray diffraction. The symmetry is trigonal, space group P3 [a=20.0476(2) A, c=8.5839(1) A]. The structure consists of anionic fluorinated gallophosphate chains of D4R units hosting F−. The location of the fluorine atoms was confirmed by 19 F solid-state NMR spectroscopy. Two signals corresponding to F− trapped in D4R units (δ=−73 ppm/CFCl3) and to terminal fluorine (δ=−166 ppm/CFCl3) are observed. The negative charge of the inorganic chains is compensated by the doubly protonated amine. This new gallophosphate shows low thermal stability, a complete amorphization being observed after calcination at 300°C.
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