Polymeric aqua(nitrato-kappa(2)O,O')(1,10-phenanthroline-kappa(2)N,N')(2,3-pyrazinedicarboxylato-kappa(2)N,O)europium(III) monohydrate.

In polymeric [Eu(pzdc)(NO(3))(phen)(H(2)O)].H(2)O [pzdc is 2,3-pyrazinedicarboxylate (C(6)H(2)O(4)) and phen is 1,10-phenanthroline (C(12)H(8)N(2))], each europium(III) ion is coordinated by seven O atoms (from three pzdc anions, a nitrate anion and a water molecule) and the two N atoms of the phen ligand, resulting in a nine-coordinated europium(III) center with a distorted monocapped square-antiprismatic coordination polyhedron. Four pzdc anions bridge four europium(III) ions, forming a parallelogram unit, the four vertices of which are occupied by the four pzdc anions. Moreover, each parallelogram unit links six other adjacent parallelogram units, forming a two-dimensional network with disordered lattice water molecules.