Dual emission from stoichiometrically mixed lanthanide complexes of 3-phenyl-4-benzoyl-5-isoxazolonate and 2,2′-bipyridine

The luminescence properties of the three new stoichiometrically mixed lanthanide complexes, Sm 1/2 Eu 1/2 (PBI) 3 · bpy·H 2 O (1), Sm 1/2 Tb 1/2 (PBI) 3 ·bpy·H 2 O (2) and Eu 1/2 Tb 1/2 (PBI) 3 ·bpy·H 2 O (3) [HPBI = 3-phenyl-4-benzoyl-5-isoxazolone; bpy = 2,2′-bipyridine] have been compared with those of the analogous single lanthanide ion systems, Sm(PBI) 3 ·bpy·H 2 O (4), Eu(PBI) 3 · bpy·H 2 O (5) and Tb(PBI) 3 ·bpy·H 2 O (6). Compound 5 was structurally characterized by single-crystal X-ray diffraction, and crystallizes in the triclinic space group P1 with a = 12.839(3) Å, b = 13.863(3) Å, c = 16.379(3) Å, α = 81.66(3)°, β = 73.32(3)°, γ = 89.26(3)° and V = 2762.0(10) Å 3 . The crystal structure of 5 comprises an assembly of mononuclear species, each of which features a central Eu 3+ cation coordinated to three bidentate PBI ligands, a bidentate bipy ligand, and a water molecule. The overall geometry of the nonacoordinate array is that of a distorted monocapped trigonal prism