Spectroscopic and Crystal Structure of Europium(III) Picrate Complexes with Novel BINOL Derivatives

Two novel ligands N-Benzyl-2-{2′-[(benzyl-phenyl-carbamoyl)-methoxy]-[1,1′]binaphthalenyl-2-yloxy}-N-phenyl-acetamide (L1) and N-Methyl-2-{2′-[(methyl-phenyl-carbamoyl)-methoxy]-[1,1′]binaphthalenyl-2-yloxy}-N-phenyl-acetamide (L2), and their europium(III) complexes with picrate, [Eu(pic)3(L1)] and [Eu(pic)3(L2)], were synthesized and characterized by elemental analysis, IR, UV-Vis and fluorescence spectroscopy. The crystal structure of [Eu(pic)3(L1)]·2CHCl3 was determined by single crystal X-ray diffraction. The europium atom is coordinated by nine oxygen atoms of four from the L1 and five from two bidentate and one unidentate picrates. The fluorescent intensity of [Eu(pic)3(L2)] is about 2.6 times that of [Eu(pic)3(L1)] in solid states. But in CHCl3 solution, the fluorescent intensity of [Eu(pic)3(L1)] is stronger slightly than [Eu(pic)3(L2)].