Tetra-μ-benzoato-κ4O:O′;κ3O:O,O′;κ3O,O′:O′-bis[(benzoato-κ2O,O′)(1,10-phenanthroline-κ2N,N′)terbium(III)] benzoic acid disolvate

Abstract

The asymmetric unit of the title complex, [Tb2(C7H5O2)6(C12H8N2)2]·2C7H6O2, consists of one-half of the complex molecule, which lies on a crystallographic inversion centre, and one benzoic acid solvent molecule. The two TbIII ions are linked by four bridging benzoate ions, with a Tb...Tb distance of 3.9280 (6) Å. Additionally, each TbIII ion is coordinated by one phenanthroline heterocycle and a bidentate benzoate ion. The irregular nine-coordinated geometry of the TbIII ion is composed of seven O and two N atoms. The molecular structure is stabilized by intramolecular C—H...O hydrogen bonds. In the crystal structure, molecules are linked into chains along the a axis by intermolecular C—H...O hydrogen bonds. The crystal structure is further stabilized by intermolecular C—H...O and C—H...π interactions. Weak π–π interactions are also observed [centroid–centroid distances = 3.6275 (14)–3.6604 (14) Å].