title: A series of dinuclear lanthanide complexes with slow magnetic relaxation for Dy2and Ho2.
abstract: The employment of a new Schiff base ligand, 2-{[(2-hydroxy-3-methoxybenzyl)imino]methyl}naphthalen-1-ol (H2L), in 4f-metal chemistry has led to the formation of seven new isostructural lanthanide(iii) complexes. More specifically the 1 : 1 reaction of Ln(NO3)3·6H2O and H2L in ethanol in the presence of 3 equivalents of pyridine yielded seven dinuclear complexes of compositions [Ln2L2(NO3)2(C2H5OH)2]·0.5py (Ln = Eu (1), Gd (2), Tb (3), Dy (4), Ho (5), Er (6), Yb (7); py = pyridine). The structures of the isomorphous complexes 1-7 were determined by single-crystal X-ray crystallography. X-ray crystallography data reveal that each compound is neutral, and contains two doubly-deprotonated ligands, two chelated nitrates and two coordinated ethanol molecules. The two LnIIIatoms in 1-7 are doubly bridged by the two phenolato oxygen atoms of two L2-ligands. Each of the two lanthanide ions is eight-coordinated and possesses distorted dodecahedron geometry. Dc magnetic susceptibility studies in the 2-300 K range reveal probably a weak antiferromagnetic interaction for 2, 3 and 6, and a ferromagnetic interaction at low temperature for 4 and 5. Complexes 4 and 5 show slow magnetic relaxation behavior. The Uefffor 4 of 66.7 K is a relatively high value among the reported Dy2SMMs. Complex 5 is a very rare example of a Ho2compound which exhibits slow magnetic relaxation.
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China. liyahong@suda.edu.cn weiliu@suda.edu.cn.
authors.forename: Jin
authors.initials: J
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China. liyahong@suda.edu.cn weiliu@suda.edu.cn.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China. liyahong@suda.edu.cn weiliu@suda.edu.cn.
authors.forename: Yanmei
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, P. R. China.
authors.forename: Xiangfei
authors.initials: X
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China. liyahong@suda.edu.cn weiliu@suda.edu.cn.
authors.forename: Yahong
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China. liyahong@suda.edu.cn weiliu@suda.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, P. R. China.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Dong