A new ternary complex of europium nitrate [Eu(H2L)(NO3)3] (L denotes the macrocyclic ligand) with a diphenol macrocyclic ligand has been synthesized by [2＋2] condensation of 1,3-propyldiamine with 2,6-diformyl-4-methylphenol in the presence of europium nitrate, and systematically characterized by physical methods. The study of X-ray analysis shows that the complex is neutral molecule and composed of a enropium ion, a nertral macrocyclic ligand and three coordinated nitrates. The crystal crystallizes in the monoclinic system, space group P21/c with a＝1.57296(11) nm, b＝0.96957 (7) nm, c＝1.91196(13) nm, β＝104.445(1)°, V＝2.8237(3) nm3, Z＝4, R＝0.0507, and wR＝0.1168. The central ion Eu3＋ is ten-coordinated in the coordination geometry of a distorted bicapped square-antiprism. At 77 K, excitation of the title complex in methanol solution give rise to the characteristic emissions of the Eu3＋ ion.

Key words: diphenol macrocyclic ligand, europium nitrate ternary complex, synthesis, crystal structure, luminescent property