catena-Poly[[[tetraaquasamarium(III)]-di-μ-isonicotinato-κ4O:O′] chloride]

In the structure of the title compound, {[Sm(C6H4NO2)2(H2O)4]Cl}n, the unique SmIII atom lies on a crystallographic twofold axis and is eight-coordinated by four O atoms from four isonicotinate ligands and four water mol­ecules in a slightly distorted square-anti­prismatic coodination environment. The SmIII atoms are bridged by two carboxyl­ate groups of two isonicotinate ligands, forming an extended chain along the c-axis direction. These chains are cross-linked through hydrogen bonds, forming a three-dimensional framework, with channels which accommodate the chloride anions.