title: Assembling Dysprosium Dimer Units into a Novel Chain Featuring Slow Magnetic Relaxation via Formate Linker.
abstract: A dinuclear complex [DyLClCH3OH)]2(1) and a one-dimensional compound [DyL(HCOO)(CH3OH)]n(2) have been synthesized using an organic ligand of N'-(2-hydroxybenzylidene)picolinohydrazide (H2L). Complex 1 exhibits a symmetric dinuclear structure, in which the Dy3+centers reside in a pentagonal-bipyramidal coordination environment. In 2, the dinuclear units of 1 are strung into chains by formate anions, in which Dy3+ions are situated in an octa-coordinated, hula-hoop-like coordination geometry. Magnetic studies reveal that ferromagnetic coupling is found between Dy3+ions in both compounds. Complexes 1 and 2 exhibit slow magnetic relaxation under zero dc field with effective energy barriers of 88.4 and 175.8 K, respectively. Magnetic study combined with ab initio calculations indicates that the better performance of 2 is related to the unique molecular geometry and relatively stronger Dy3+-Dy3+magnetic interaction within and/or between the dimer units.
authors.affiliation: Department of Chemistry and Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University , Beijing 100875, P. R. China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.affiliation: Department of Chemistry and Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University , Beijing 100875, P. R. China.
authors.forename: Fang
authors.initials: F
authors.lastname: Ma
authors.affiliation: Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Yin-Shan
authors.initials: YS
authors.lastname: Meng
authors.affiliation: Department of Chemistry and Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University , Beijing 100875, P. R. China.
authors.forename: Hao-Ling
authors.initials: HL
authors.lastname: Sun
authors.affiliation: Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University , Nanjing 210023, P. R. China.
authors.forename: Yi-Quan
authors.initials: YQ
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Song
authors.initials: S
authors.lastname: Gao