Sodium samarium tetra­kis­(poly­phosphate), NaSm(PO3)4

Abstract

NaSm(PO3)4 has been prepared by solid state reactions. It belongs to type II of the structural family of M I Ln III(PO3)4 compounds (M I = alkali metal and Ln III = rare earth metal) and is composed of ∞(PO3)n]n− polyphosphate chains with a repeating unit of four PO4 tetra­hedra. The chains extend parallel to [100] and share O atoms with irregular SmO8 polyhedra, forming a three-dimensional framework which delimits tunnels occupied by Na+ cations in a distorted octa­hedral environment