title: Construction of Ni(II)Ln(III)M(III) (Ln = Gd(III), Tb(III); M = Fe(III), Cr(III)) clusters showing slow magnetic relaxations.
abstract: Four heterotrimetallic 3d-3d'-4f complexes, [Ni(L)Gd(H2O)4][Cr(CN)6]CH3OH·2H2O (1), [Ni(L)Tb(H2O)4][Cr(CN)6]CH3OH·2H2O (2), [Ni(L)Gd(H2O)4][Fe(CN)6]·3H2O (3), and [Ni(L)Tb(H2O)4][Fe(CN)6]CH3OH·2H2O (4) (H2L = N,N-ethylenebis(3-methoxysalicylaldiimine)), were synthesized and characterized structurally and magnetically. The X-ray structural analysis revealed that these complexes are isostructural, in which Ni(II)Ln(III)M(III) (Ln = Tb(III), Gd(III); M = Fe(III), Cr(III)) is arranged in trinuclear clusters. Then, these clusters further interact with each other via weak hydrogen bonds to form high dimensional supramolecular networks. Magnetic investigation indicates that the Ni(II) centers are diamagnetic. Dominant antiferromagnetic coupling is presented in complexes 1 and 3. An ac magnetic susceptibility measurement indicates that complexes 2 and 4 show typical field induced slow magnetic relaxation, which might be caused by the magnetic anisotropy of the central Tb(III) ions.
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China. xiaopingshen@163.com.
authors.forename: Chao
authors.initials: C
authors.lastname: Chen
authors.affiliation: School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
authors.forename: Yashu
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China. xiaopingshen@163.com.
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China. xiaopingshen@163.com.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zhou
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China. xiaopingshen@163.com.
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Shen