Luminescent properties and structure of new CAPh-based lanthanide complexes [LnL(3)Q], containing additional bis-heterocyclic aromatic ligand-antenna 2-(1,3,4-oxadiazole-2-yl) pyridine

作者：Yakovlev Oleksii O; Kariaka Nataliia S; Trush Victor A; Smola Sergii S^*; Siczek Milosz; Amirkhanov Vladimir M

来源：Optical Materials, 2018, 75: 459-464.

DOI：10.1016/j.optmat.2017.10.044

• Lanthanide
• Photoluminescence
• Coordination compounds
• Carbacylamidophosphates
• 1,3,4-Oxadiazole derivatives
• Sensitization

The new lanthanide coordination compounds of general formula [LnL(3)Q], where Ln = Eu, Gd, Tb; L = dimethyl-N-trichloroacetylamidophosphate and Q = 2-(1,3,4-oxadiazole-2-yl)pyridine, have been synthesized and isolated in crystalline state with the purpose of finding new interesting optical materials. X-ray data reveal that complexes have molecular structure with numerous Van-der-Vaals contacts between molecules. All the ligands are coordinated in bidentate chelate manner, coordination polyhedron was interpreted as distored square antiprism (CN 8). The obtained complexes were investigated by means of IR, absorption and luminescence spectroscopy as well and thermal gravimetric analysis. It was found that complex [TbL(3)Q] is resistant to temperature of 200 degrees C. The Eu3+ and Tb3+ complexes exhibit bright metal-centered emission with decay time 1.65 and 1.74 ms respectively. Intrinsic quantum yield for [EuL(3)Q] equals 85% that is one of the highest values, known to date for CAPh based europium complexes.

• 出版日期2018-1