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

Abstract

The asymmetric unit of the title complex, [Eu2(C7H5O2)6(C12H8N2)2]·2C6H5COOH, contains one-half of the complex molecule, the complete molecule being generated by inversion symmetry, and one benzoic acid solvent molecule. The two EuIII ions are linked by four bridging benzoate ions, with an Eu...Eu distance of 3.96041 (12) Å. Each EuIII ion is coordinated by one phenanthroline heterocycle and a bidentate benzoate ion. The irregular nine-coordinated geometry of the metal 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 by intermolecular C—H...O hydrogen bonds along the a axis. 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 = 3.6962 (10)–3.6963 (10) Å].