Bis[μ-2-(4-hydroxyphenyl)acetato]-κ(3) O,O′:O;κ(3) O:O,O′-bis{aqua(4,4′-bi­pyri­dine-κN)bis[2-(4-hydroxyphenyl)acetato-κ(2) O,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-hy­droxy­phenyl­acetic 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 mol­ecules build up an intricate three-dimensional network.