Tris(6-carboxypyridine-2-carboxylato)terbium(III) 2.75-hydrate

Abstract

In the title compound, [Tb(C7H4NO4)3]·2.75H2O, the Tb3+ atom is coordinated by three tridentate 6-carboxypyridine-2-carboxylate ligands and lies on a crystallographic threefold rotation axis. The coordination polyhedron around TbIII adopts a distorted tricapped trigonal–prismatic geometry. Disordered water molecules with partial occupancy are also present in the crystal, one of which is associated with each of the carboxylate O atoms of the complex unit.