Diaquabis(1-naphthaleneacetato-κO)-bis(1,10-phenanthroline-κ2N,N′)-erbium(III) 1-naphthaleneacetate monohydrate

In title compound, [Er(C12H9O2)2(C12H8N2)2(H2O)2](C12H9O2)·H2O, the carboxyl groups have only a monodentate coordination mode. The ErIII atom is eight-coordinated in a distorted dodeca-hedral environment by four O and four N atoms from two 1-naphthalene-acetic acid (NAA) ligands, two aqua ligands and two 1,10-phenanthroline (phen) ligands. A twofold rotation axis passes through Er. The mol-ecules are linked into sheets by O - H⋯O and C - H⋯O hydrogen bonds. There is disorder in the anion and in the solvent water mol-ecule; the site occupancies were set equal to 0.5. © International Union of Crystallography 2007.