A novel luminescent coordination compound Eu(TTA)3(DEDAF)(1, TTA = 1,1,1-trifluoro-3-(2-thenoyl)acetone, DEDAF = 9,9-diethyl-4,5-diazafluoren) has been synthesized and fully characterized by infrared spectrum,...A novel luminescent coordination compound Eu(TTA)3(DEDAF)(1, TTA = 1,1,1-trifluoro-3-(2-thenoyl)acetone, DEDAF = 9,9-diethyl-4,5-diazafluoren) has been synthesized and fully characterized by infrared spectrum, elemental analysis, UV-vis spectrum, etc. X-ray single-crystal diffraction analysis reveals that compound 1 shows a mononuclear structure with the europium atom in coordinating to one DAF and three TTA ligands. The mononuclear structure units are assembled into a 3-D polymer by hydrogen bonds and π-π interactions. Photoluminescent property of 1 was investigated in detail at room temperature. Complex 1 emits strong red luminescence. However, it could be quenched even by small amount of water. The fluorescence intensity at 614 nm decreases linearly with the water content increasing(vol% in acetonitrile) in the range of 0.025~0.2% under 278 nm excitation. Thermogravimetric analysis has also been studied, which demonstrates good thermal stability of 1.展开更多
According to fluorescent spectra of a series of Eu(Ⅲ) ternary complexes in the three solvents EtOH, DMF and CH3CN, the fluorescence is stronger in the solvent CH3CN than in the solvents EtOH and DMF, and fluorescent ...According to fluorescent spectra of a series of Eu(Ⅲ) ternary complexes in the three solvents EtOH, DMF and CH3CN, the fluorescence is stronger in the solvent CH3CN than in the solvents EtOH and DMF, and fluorescent intensity is contrary to the affinity of three solvents with rare earth ions. Center ions emit fluorescence mainly by an intramolecular energy transfer from the broad absorbing β-diketonate TTA, BTA or BA to the chelated rare earth ions.展开更多
基金supported by the Natural Science Foundation of Zhejiang Province(No.LY16B030009)National Natural Science Foundation of China(No.61205184)521 Talent Cultivation of Zhejiang Sci-Tech University(521 talent project of ZSTU)
文摘A novel luminescent coordination compound Eu(TTA)3(DEDAF)(1, TTA = 1,1,1-trifluoro-3-(2-thenoyl)acetone, DEDAF = 9,9-diethyl-4,5-diazafluoren) has been synthesized and fully characterized by infrared spectrum, elemental analysis, UV-vis spectrum, etc. X-ray single-crystal diffraction analysis reveals that compound 1 shows a mononuclear structure with the europium atom in coordinating to one DAF and three TTA ligands. The mononuclear structure units are assembled into a 3-D polymer by hydrogen bonds and π-π interactions. Photoluminescent property of 1 was investigated in detail at room temperature. Complex 1 emits strong red luminescence. However, it could be quenched even by small amount of water. The fluorescence intensity at 614 nm decreases linearly with the water content increasing(vol% in acetonitrile) in the range of 0.025~0.2% under 278 nm excitation. Thermogravimetric analysis has also been studied, which demonstrates good thermal stability of 1.
文摘According to fluorescent spectra of a series of Eu(Ⅲ) ternary complexes in the three solvents EtOH, DMF and CH3CN, the fluorescence is stronger in the solvent CH3CN than in the solvents EtOH and DMF, and fluorescent intensity is contrary to the affinity of three solvents with rare earth ions. Center ions emit fluorescence mainly by an intramolecular energy transfer from the broad absorbing β-diketonate TTA, BTA or BA to the chelated rare earth ions.