catena-Poly[neodymium(III)-bis­[μ-N-(dimorpholinophosphor­yl)benzene­sulfonamidato]-sodium(I)-bis­[μ-N-(dimorpholinophosphor­yl)benzene­sulfonamidato]]

The cubic crystal structure of the title compound, [NaNd(C(14)H(21)N(3)O(5)PS)(4)](n), is composed of one-dimensional polymeric chains propagating in [100], built up from [Nd(C(14)H(21)N(3)O(5)PS)(4)](−) anions and sodium cations functioning as linkers. In the complex anion, the Nd(3+) ion has an eightfold coordination environment formed by the sulfonyl and phosphoryl O atoms of four bidentate chelating N-(dimorpholinophosphor­yl)benzene­sulfonamidate ligands: the resulting NdO(8) polyhedron can be described as inter­mediate between dodeca­hedral and square anti­prismatic. The sodium ion adopts an NaO(4) tetra­hedral geometry arising from four monodentate benzene­sulfonamidate ligands. The resulting crystal structure is unusual because it contains substantial voids (800 Å(3) per unit cell), within which there is no evidence of included solvent.