Crystal structure and luminescence of europium4-methoxybenzoate complex with 2,2′-bipyridine[Eu(p-MOBA)3bipy] · 1⧸2C2H5OH

Abstract

Europium 4-methoxybenzoate complex with 2,2′-bipyridine, [Eu( p-MOBA) 3bipy] · 1⧸2C 2H 5OH (where p-MOBA=4-methoxybenzoate and bipy=2,2′-bipyridine), was obtained in the ethanol solution and the crystal structure was determined by X-ray diffraction. The crystal consists of binuclear molecules of the title compound. In the complex each Eu 3 ion is nine-coordinate to one bipyridine molecule, one bidentate carboxylate group and four bridging carboxylate groups in which the carboxylate groups are bonded to the europium ion in three modes: the chelating bidentate, the bridging bidentate and the bridging tridentate. Excitation and luminescence data observed at 77 K show that the Eu 3 ion site in the complex has low symmetry and when excited a slight change of chemical environments of the Eu 3 ion is observed.