Mixed Tin Valence in the Tin(II/IV)-Nitridophosphate Sn3P8N16

Chemistry. 2024 May 8:e202401428. doi: 10.1002/chem.202401428. Online ahead of print.ABSTRACTSn3P8N16 combines the structural versatility of nitridophosphates and Sn within one compound. It was synthesized as dark gray powder in a high-pressure high-temperature reaction at 800 °C and 6 GPa from Sn3N4 and P3N5. The crystal structure was elucidated from single-crystal diffraction data (space group C2/m (no. 12), a = 12.9664(4), b = 10.7886(4), c = 4.8238(2) Å, β = 109.624(1)°) and shows a 3D-network of PN4 tetrahedra, incorporating Sn in oxidation states +II and +IV. The Sn cations are located within eight-membered rings of vertex-sharing PN4 tetrahedra, stacked along the [001] direction. A combination of solid-state nuclear magnetic resonance spectroscopy, 119Sn Mössbauer spectroscopy and density functional theory calculations was used to confirm the mixed oxidation of Sn. Temperature-dependent powder X-ray diffraction measurements reveal a low thermal expansion of 3.6 ppm/K up to 750 °C, beyond which Sn3P8N16 starts to decompose.PMID:38717583 | DOI:10.1002/chem.202401428

Source: Chemistry - May 8, 2024 Category: Chemistry Authors: Sebastian J Ambach Aylin Koldemir Kristian Witthaut Sandra Kreiner Thomas Br äuniger Rainer P öttgen Wolfgang Schnick Source Type: research