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

Abstract

Two dimeric rare earth complexes [Eu( m-MOBA) 3(phen)] 2 ( I) and [Tb( m-MOBA) 3(phen)] 2·2C 2H 5OH ( II) (where m-MOBA = m-methoxybenzoate, phen = 1,10-phenanthroline) were synthesized and structurally characterized. Both complexes consist of neutral dimeric molecules. Complex I crystallizes in triclinic system, space group P 1 ¯ . Each Eu(III) ion is nine-coordinated with one 1,10-phenanthroline molecule, one bidentate chelating carboxylate group, two bridging bidentate carboxylate groups and two bridging tridentate chelating carboxylate groups. Complex II crystallizes in triclinic system, space group P 1 ¯ . Each Tb(III) is eight-coordinated with one 1,10-phenanthroline molecule, one bidentate chelating carboxylate group and four bridging bidentate carboxylate groups. Complex I shows bright red luminescence, II shows green luminescence under UV light at room temperature, respectively. The thermal analysis indicates that they are all quite stable to heat.