Bis[μ-2-(4-hydroxyphenyl)acetato]-κO,O':O;κO:O,O'-bis{aqua(4,4'-bi-pyri-dine-κN)bis[2-(4-hydroxyphenyl)acetato-κO,O']gadolinium(III)} monohydrate.

In the dinuclear title complex, [Gd(2)(C(8)H(7)O(3))(6)(C(10)H(8)N(2))(2)(H(2)O)(2)]·H(2)O, the two Gd(III) ions are nine-coordinated by seven O atoms from four deprotonated p-hy-droxy-phenyl-acetic acid (PAA) ligands, one water O atom and an N atom from a 4,4'-bypyridine (bipy) ligand in a distorted tricapped trigonal-prismatic geometry. The deprotonated PAA ligands are coordinated to the Gd(III) atom either as chelating on the same metal or in a tridentate bridging mode. Numerous O-H⋯O and O-H⋯N hydrogen bonds involving hydroxyl, coordinated and uncoordinated water mol-ecules build up an intricate three-dimensional network.