Synthesis and Properties of Eu(Ⅲ) Complexes with Aromatic Carboxylic Acid, Dibenzoylmethane and 1, 10-phenanthroline

In order to obtain an excellent luminescent material, herein four complexes of Eu(Ⅲ) were synthesized with dibenzoylmethane (DBM), benzoic acid (BA) and phenylacetic acid (PLA) as the anion ligands, and 1, 10-phenanthroline (phen) as the neutral ligand. The complexes Eu(DBM)3phen (1), Eu(DBM)(BA)2phen (2), Eu(DBM)(PLA)2phen (3) and Eu(DBM)2(PLA)phen (4) were characterized by elemental analysis, IR and TG-DTG. In these complexes, the Eu(Ⅲ) ions are bonded to the oxygen atoms of carboxylate (or dibenzoylmethane), and the nitrogen atoms of phen. The TG-DTG analysis indicated that these complexes are thermally stable. Their excitation and luminescence spectra revealed that the complexes emitted the characteristic luminescence of Eu(Ⅲ): 579 nm (5D0→7F0), 589 nm (5D0→7F1), 610 nm (5D0→7F2). The emission peak at ca. 610 nm was the most intensive. The order of their fluorescence intensity was: Eu(DBM)2(PLA)phen (4)>Eu(DBM)(PLA)2phen (3)>Eu(DBM)3phen (1)>Eu(DBM)(BA)2phen (2).

Synthesis,Spectra,X-ray Diffraction and Thermal Studies of New Zn(Ⅱ) Compounds Based on Dibenzoylmethane

Two new zinc（Ⅱ） compounds with dibenzoylmethane and N-donor ancillary ligands,[Zn（μ-pyz）（dbm）_2]_n（1） and [Zn（dbm）_2（μ-bpe）Zn（dbm）_2]（2）（Hdbm = dibenzoylmethane,pyz = pyrazine and bpe = 1,2-bis（4-pyridyl）ethane）,have been prepared and characterized using elemental analysis,IR,~1H NMR and 13 C NMR spectroscopy,and studied by thermal gravimetric analysis as well as single-crystal X-ray diffraction. The crystal and molecular structures of 1 and 2 have been solved by X-ray diffraction and they turned out to be a one-dimensional coordination polymer with linear dispositions of metal atoms and binuclear compound,respectively. These one-dimensional polymers are further connected to form a 3D supramolecular network by C–H···O（only in 2） and π-π interactions.

Preparation and properties of temperature sensitive paint based on Eu(DBM)_3 phen as probe molecule

Probe molecule Eu(DBM)3 phen is made up of europium oxide(EuO),dibenzoylmethane(DBM) and1,10-phenanthroline(phen). The temperature sensitive paint(TSP) was compounded by the polymerization of the probe molecule, methyl methacrylate(MMA) and the initiator of benzoyl peroxide(BPO).The structure, morphology, luminescence property of probe molecule and the temperature quenching property of the temperature sensitive paint(TSP) were characterized by infrared spectrometer, UV-vis spectrometer, scanning electron microscopy and fluorescence spectrometer respectively. The infrared spectrum and UV-vis spectra show that Eu and DBM form six membered rings, and Eu-O coordinate bonds form. The nanocrystals are in sphere-like morphology with an average size of approximately100 nm. Fluorescence spectra present that the performance of temperature quenching is excellent,what’s more, TSP sample has different temperature sensitivity in various temperature scope. Particularly,under excitation of 286 nm, TSP has a highest temperature sensitivity between 50 and 60 ℃, and the strongest fluorescence emission reaches a peak(615 nm). It indicated that probe molecule(Eu(DBM)phen) has strong luminescent intensity and the temperature quenching properties of Eu(DBM)phen/PMMA is good.

Electroluminescent properties of three ternary europium complexes with different phenanthroline derivatives

Three ternary Eu(III) complexes with general formula of Eu(DBM)3LN (DBM = dibenzoylmethanate, and LN (N = 1-3 ) stand for three different 1,10-phenanthroline derivatives) have been synthesized for vacuum deposition films-based electroluminescent devices. The complex Eu(DBM)3L3 (L3 = 2-phenyl-3-[3-(carbazol-9-yl)propyl]imidazo[4,5-f]1,10-phenan-throline) was designed with an effort to combine the electron-transporting phenanthroline platform and the hole-transporting carbazole group into one molecule expecting to improve both electron and hole transporting properties simultaneously. The results show that the variation of the neutral ligands in Eu(III) mixed ligand complexes is a simple and effective approach to the improvement in the thermal stability, PL and EL properties of materials. A double-layer device with the configuration of ITO/TPD (50 nm)/Eu(DBM)3L3 (50 nm)/Mg0.9Ag0.1 (200 nm)/Ag (100 nm) exhibited Eu(III)-based pure red emission with a maximum brightness of 561 cd/m2 at 16 V, and an onset driving voltage of 8 V. A device with the configuration of ITO/TPD (50 nm)/[Eu(DBM)3L3 (5 nm):BCP (5 nm)]4/BCP (20 nm)/AIQ (10 nm) Mg0.9Ag0.9 (110 nm)/Ag (100 nm) gave high efficient and pure red light emission with a luminance of 1419 cd/m2. Keywords dibenzoylmethane - electroluminescence - lanthanide - N ligands