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.

Two new inorganic niobium phosphates KNbP2O8 and NbPO4F2 were synthesized by using a two-step hydro/solvothermal route. Both compounds are formed by the alternative connection of Nb-octahedra and P-tetrahedra to give a (3,6)-connected microporous framework with anatase topology and a 4-connected dense solid with cag topology, respectively, which result from different local interruptions around polyhedral sites.Figure optionsDownload as PowerPoint slideResearch highlights
► A two-step solvothermal route was used to synthesize niobium phosphates.
► The ingredients of porous phosphates further reach the second row transition metals.
► The diversities of niobium phosphates can result from different local interruptions.
► Microporous phosphate displays good ion-exchange capacity.