title: Structural and Magnetic Properties of 2p-3d-4f Hetero-Tri-Spin Chains Comprising [{Cu(hfac)2 -Radical}2 ] Dimers and Ln(hfac)3 (hfac=hexafluoroacetylacetonate).
abstract: A new family of 2p-3d-4f hetero-tri-spin complexes [Ln(hfac)3 {Cu(hfac)2 (NIT-3 PyPh)}2 ] (Ln=Gd (1), Tb (2), Dy (3), Ho (4); NIT-3 PyPh=2-[4-(3-pyridinylmethoxy)phenyl]-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide; hfac=hexafluoroacetylacetonate) have been synthesized. Four complexes possess a 1D chain structure in which two radical ligands join two Cu(hfac)2 molecules to form a [{Cu(hfac)2 -rad)}2 ] dimer cycle and the dimer rings are linked by Ln(hfac)3 units. Magnetic studies show that ferromagnetic exchange couplings exist between the coordinated NO groups of radical ligands and metal ions. Field-induced slow relaxation of the magnetization was observed in the Tb and Dy compounds.
authors.affiliation: Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Mei
authors.initials: M
authors.lastname: Zhu
authors.affiliation: Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Yang
authors.affiliation: Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Hongdao
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin, 300071, China. llicun@nankai.edu.cn.
authors.forename: Licun
authors.initials: L
authors.lastname: Li
keywords: chain structures; dimerization; magnetic properties; radicals; structure elucidation