Synthesis, structures and properties of ternary rare earth complexes with fluorobenzoic acid and 1,10-phenanthroline

Three dimeric rare-earth complexes [Eu(p-FBA)(3)(phen)(H2O)](2) (1), [Tb(p-FBA)(3)phen](2) (2), and [Tb(o-FBA)(3)phen](2) (3) (where p-FBA=p-fluorobenzoate, o-FBA=o-fluorobenzoate, phen=1,10-phenanthroline) were synthesized and structurally characterized. All are neutral dimeric molecules. Complex I crystallizes in triclinic system, space group PT. Each Eu(Ill) ion is eight-coordinate with one 1,10-phenanthroline, one monodentate carboxylate, one water and four bridging carboxylates. Complex 2 crystallizes in triclinic system, space group Pi. Each Tb(III) is also eight-coordinate with one 1,10-phenanthroline molecule, one bidentate chelating carboxylate and four bridging carboxylates. Complex 3 crystallizes in the monoclinic system, space group P2(1)/c and consists of two crystallographically different binuclear molecules. Tb(III) ions are eight-coordinate with one 1,10-phenanthroline, one bidentate chelating carboxylate and four bridging carboxylates in both of them. Complex I shows bright red luminescence, 2 and 3 show green luminescence under UV light at room temperature. Thermal analysis indicates that are all quite stable to beat.