SrH₄P₆N₁₂ and SrP₈N₁₄: Insights into the Condensation Mechanism of Nitridophosphates under High Pressure.

Wendl, Sebastian; Schnick, Wolfgang

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 °C). Stoichiometric amounts of Sr(N3)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, 1H and 31P 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. Big squeeze: The (imido)nitridophosphates SrH4P6N12 and SrP8N14 were synthesized under high‐pressure/high‐temperature conditions at 5 GPa and 1075 °C. The crystal structures were solved from X‐ray diffraction data and confirmed by Rietveld refinement, EDX, FTIR, and solid‐state NMR spectroscopy. The structural relation of both compounds gives first insights into the condensation mechanism of nitridophosphates under high pressure.

CONDENSATION; HIGH pressure (Technology); STOICHIOMETRY; CRYSTAL structure; NUCLEAR magnetic resonance spectroscopy

Chemistry - A European Journal, 2018, Vol 24, Issue 59, p15889

0947-6539

Academic Journal

10.1002/chem.201803125