Tetrahedral/octahedral frameworks with different local interruptions: Syntheses and structures of two new inorganic niobium phosphates

Two new niobium phosphates KNbP2O8 (1) and NbPO4F2 (2) were synthesized by using a two-step hydro/solvothermal procedure and structurally characterized by sing-crystal X-ray diffractions. Both compounds are based on the alternative connection of Nb-octahedra and P-tetrahedra to form extended three-dimensional solids with different local interruptions around polyhedral sites. Compound 1 features a (3,6)-connected microporous anionic framework exhibiting local interruptions around the P-tetrahedra, and compound 2 gives a 4-connected dense solid with local interruptions around the Nb-octahedra.