title: Crystal structure and highly luminescent properties studies of bis-β-diketonate lanthanide complexes.
abstract: A new bis(β-diketonate), 1,3-bis(4,4,4-trifluoro-1,3-dioxobutyl)phenyl (BTP), which contains a trifluorinated alkyl group, has been prepared for the synthesis of two series of dinuclear lanthanide complexes with the general formula Ln2(BTP)3L2 [Ln(3+) = Eu(3+), L = DME(1), bpy(2), and phen(3); Ln(3+) = Sm(3+), L = DME(4), bpy(5), and phen(6); DME = ethylene glycol dimethyl ether, bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline]. The crystal structure of the free ligand has been determined and shows a twisted arrangement of the two binding sites around the 1,3-phenylene spacer. X-ray crystallographic analysis reveals that complexes 1, 2, 4, and 5 are triple-stranded dinuclear structures formed by three bis-bidentate ligands with two lanthanide ions. The room-temperature photoluminescence (PL) spectra of complexes 1-6 show that this bis-β-diketonate can effectively sensitize rare earths (Sm(3+) and Eu(3+)) and produce characteristic emissions of the corresponding Eu(3+) and Sm(3+) ions. In addition, two bidentate nitrogen ancillary ligands, 2,2'-bipyridine (bpy) and 1,10-phenanthroline (phen), have been employed to enhance the luminescence quantum yields and lifetimes of both series of Eu(3+) and Sm(3+) complexes.
authors.affiliation: Key Laboratory of Chemical Engineering Process and Technology for High-Efficiency Conversion, School of Chemistry and Materials Science, Heilongjiang University, No.74, Xuefu Road, Nangang District, Harbin 150080, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Shi
authors.forename: Yanjun
authors.initials: Y
authors.lastname: Hou
authors.forename: Wenyi
authors.initials: W
authors.lastname: Chu
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Shi
authors.forename: Huiquan
authors.initials: H
authors.lastname: Gu
authors.forename: Bilin
authors.initials: B
authors.lastname: Wang
authors.forename: Zhizhong
authors.initials: Z
authors.lastname: Sun