Synthesis, bright luminescence and crystal structure of a novel neutral europium complex

Abstract A novel organic ligand, 6-diphenylamine carbonyl 2-pyridine carboxylic acid, and the corresponding europium complex, tris(6-diphenylamine carbonyl 2-pyridine carboxylato) europium(III) (Eu-DPAP) have been designed and synthesized. The crystal structure and photoluminescence of Eu-DPAP complex have been studied. The results showed that Eu-DPAP is an electroneutral complex that emits very strong red fluorescence. The lifetime of 5 D 0 of Eu 3+ in the complex solid was examined using time-resolved spectroscopy, and the value for crystalline Eu(DPAP) 3 ·12H 2 O is 0.69±0.01 ms.