title: SrP3N5O: a highly condensed layer phosphate structure solved from a nanocrystal by automated electron diffraction tomography.
abstract: The oxonitridophosphate SrP(3)N(5)O has been synthesized by heating a multicomponent reactant mixture that consisted of phosphoryl triamide OP(NH(2))(3), thiophosphoryl triamide SP(NH(2))(3), SrS, and NH(4)Cl enclosed in evacuated and sealed silica-glass ampoules up to 750 °C. The compound was obtained as nanocrystalline powder with needle-shaped crystallites. The crystal structure was solved ab initio on the basis of electron diffraction data by means of automated electron diffraction tomography (ADT) and verified by Rietveld refinement with X-ray powder diffraction data. SrP(3)N(5)O crystallizes in the orthorhombic space group Pnma (no. 62) with unit-cell data of a=18.331(2), b=8.086(1), c=13.851(1) Å and Z=16. The compound is a highly condensed layer phosphate with a degree of condensation κ=½. The corrugated layers (∞)(2){(P(3)N(5)O)(2-)} consist of linked, triangular columns built up from P(O,N)(4) tetrahedra with 3-rings and triply binding nitrogen atoms. The Sr(2+) ions are located between the layers and exhibit six-, eight-, and ninefold coordination. FTIR and solid-state NMR spectra of SrP(3)N(5)O are discussed as well.
authors.affiliation: Department Chemie, Ludwig-Maximilians-Universität, Butenandtstrasse 5-13 (D), 81377 München, Germany.
authors.forename: Stefan J
authors.initials: SJ
authors.lastname: Sedlmaier
authors.forename: Enrico
authors.initials: E
authors.lastname: Mugnaioli
authors.forename: Oliver
authors.initials: O
authors.lastname: Oeckler
authors.forename: Ute
authors.initials: U
authors.lastname: Kolb
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schnick