catena-Poly[[tetra­kis­(hexa­methyl­phospho­ramide-κO)bis­(nitrato-κ(2) O,O′)dysprosium(III)] [molybdenum(VI)-di-μ-sulfido-silver(I)-di-μ-sulfido]]

Hexamethyl­phospho­ramide (hmp), tetra­thio­molybdate, silver sulfide and dysprosium nitrate were self-assembled to form an anionic [AgMoS(4)](n) (n−) chain in the title complex, {[Dy(NO(3))(2)(C(6)H(18)N(3)OP)(4)][AgMoS(4)]}(n). The central Dy atom in the cation is coordinated by eight O atoms from two nitrate and four hmp ligands, resulting in a distorted square-anti­prismatic environment. Together with the two nitrate ligands, the cation is monovalent, which leads to the anionic chain having an [AgMoS(4)] repeat unit. The polymeric anionic chain, with Mo—Ag—Mo and Ag—Mo—Ag angles of 161.911 (13) and 154.014 (13)°, respectively, presents a distorted linear configuration. The title complex is isostructural with the W analogue.