Crystal structure and luminescence property of lanthanide complexes with 2-fluorobenzoic acid and 2,2′-bipyridine

The two compounds of [ Ln (2-FBA)(3) (.) 2, 2'-bpy ](2) (2-FBA = 2-fluorobenzoato, 2, 2'-bpy = 2, 2'-bipyridine, Ln = Eu(1), Dy(2)) were synthesized and their structures were determined by X-ray diffraction method. Crystallized complexes 1 and 2 are isomorphous, monoclinic system with P2(1)/n space group. The two complexes are binuclear molecule with an inversion center. The two lanthanide ions are linked by four bridged 2-FBA ligands and each lanthanide ion is further bonded to one chelated bidentate 2-FBA ligand and one 2,2'-bipytidine molecule. The coordination number of metal ion is eight. The europium complex exhibits strong red fluorescence. D-5(0)-> F-7(j)(j = 1 similar to 4) transition emission of Eu3+, ion was observed.