SrP 3 N 5 NH: A Framework‐Type Imidonitridophosphate Featuring Structure‐Directing Hydrogen Bonds

Nitridophosphates and imidonitridophosphates show intriguing structural diversity, including unprecedented structure types. Highly condensed strontium imidonitridophosphate SrP 3 N 5 NH has been synthesized at 8 GPa and 1100 °C using a high‐pressure high‐temperature approach starting from stoichiometric amounts of Sr(N 3 ) 2 , P 3 N 5 and NH 4 Cl. Herein, NH 4 Cl was used as a hydrogen source and as a precursor for in situ formation of SrCl 2 , which acts as mineralizer and facilitates growth of single‐crystals with a diameter of ≤30 μm. SrP 3 N 5 NH ( P 2 1 / c (no. 14), a= 5.01774(2), b= 8.16912(4), c= 12.70193(5) Å, β =101.7848(3)°, Z= 4) adopts an unprecedented network structure, represented by the point symbol (3.4.5.6.7 2 )(3.4.5.7 2 .8)(3.6.7 3 .8). This unique three nodal P/N(H) network is stabilized by moderately strong hydrogen bonds causing a structure‐directing effect, which has not yet been reported for imidonitridophosphates.