title: Two mononuclear single molecule magnets derived from dysprosium(III) and tmphen (tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline).
abstract: Two mononuclear Dy(III) complexes, [Dy(III)(hfac)3(tmphen)] (1) and [Dy(III)(acac)3(tmphen)]·2H2O (2) (tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline, hfac = hexafluoroacetylacetone, acac = acetylacetone) have been synthesized and structurally characterized by single crystal X-ray diffraction. Magnetic properties indicate that both of the complexes exhibit SMM behavior, and complex 1 is the first typical derivative of phenanthroline containing D2d-Dy(III) based mononuclear single molecule magnets. The energy barrier (Ueff/kB) of complex 2 (130.42 K) is much higher than that of complex 1 (35.09 K), indicating that the local symmetry of Dy(III) ions (D2d for 1, D4d for 2) plays an important role in magnetic behaviors.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin, 300071, P. R. China. wangql@nankai.edu.cn.
authors.forename: Yu-Zhang
authors.initials: YZ
authors.lastname: Tong
authors.forename: Chen
authors.initials: C
authors.lastname: Gao
authors.forename: Qing-Lun
authors.initials: QL
authors.lastname: Wang
authors.forename: Bing-Wu
authors.initials: BW
authors.lastname: Wang
authors.forename: Song
authors.initials: S
authors.lastname: Gao
authors.forename: Peng
authors.initials: P
authors.lastname: Cheng
authors.forename: Dai-Zheng
authors.initials: DZ
authors.lastname: Liao