catena-Poly[[[(1,10-phenanthroline-κ(2) N,N′)praseodymium(III)]-di-μ-4-hydroxy­benzoato-κ(4) O (1):O (1′)-μ-nitrato-κ(3) O,O′:O] bis­(1,10-phenanthroline)]

The title complex, [Pr(C(7)H(5)O(3))(2)(NO(3))(C(12)H(8)N(2))]·2C(12)H(8)N(2), has a polymeric chain structure, with two uncoordinated 1,10-phenanthroline mol­ecules in the lattice. The Pr(III) centre has a monocapped square-anti­prismatic coordination geometry, comprised of two N atoms from one chelating 1,10-phenanthroline ligand, four carboxyl­ate O atoms from four 4-hy­droxy­benzoate anions and three O atoms from two nitrate anions. The 4-hy­droxy­benzoate and nitrate anions function as μ(2)-bridging ligands and link the Pr(III) ions into a one-dimensional chain structure along the c axis. Inter­molecular O—H⋯N hydrogen bonds are observed between the 4-hy­droxy­benzoate anions and the uncoordinated 1,10-phenanthroline mol­ecules.