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Wendl, Sebastian; Schnick, Wolfgang (2018): SrH4P6N12 and SrP8N14: Insights into the Condensation Mechanism of Nitridophosphates under High Pressure. In: Chemistry - A European Journal, Vol. 24, No. 59: pp. 15889-15896
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Abstract

The (imido)nitridophosphates SrH4P6N12 and SrP8N14 were synthesized as colorless crystals by high-pressure/high-temperature reactions using the multianvil technique (5 GPa, ca. 1075 degrees C). Stoichiometric amounts of Sr(N-3)(2,) P3N5, and amorphous HPN2 were used as starting materials. Whereas the crystal structure of SrH4P6N12 was solved and refined from single-crystal X-ray diffraction data and confirmed by Rietveld refinement, the structure of SrP8N14 was determined from powder diffraction data. In order to confirm the structures, H-1 and P-31 solid-state NMR spectroscopy and FTIR spectroscopy were carried out. The chemical composition was confirmed with EDX measurements. Both compounds show unprecedented layered network structure types, built up from all-side vertex-sharing PN4 tetrahedra which are structurally related. The structural comparison of both compounds gives first insights into the hitherto unknown condensation mechanism of nitridophosphates under high pressure.