Bis[μ-2-(4-hydroxyphenyl)acetato]-κ3O,O′:O;κ3O:O,O′-bis{aqua(4,4′-bipyridine-κN)bis[2-(4-hydroxyphenyl)acetato-κ2O,O′]gadolinium(III)} monohydrate

In the dinuclear title complex, [Gd-2(C8H7O3)(6)(C10H8N2)(2)(H2O)(2)]center dot H2O, 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 center dot center dot center dot O and O-H center dot center dot center dot N hydrogen bonds involving hydroxyl, coordinated and uncoordinated water molecules build up an intricate three-dimensional network.