title: Structures with tunable strong ferromagnetic coupling: from unordered (1D) to ordered (Discrete).
abstract: The X-ray crystal structures, magnetic susceptibilities from 2 to 300 K, and theoretical analyses of the magnetism for 1D and trinuclear azido Cu(II) carboxylate complexes [Cu(1.5)(hnta)(N(3))(2)(H(2)O)](n) (1) and [Cu(3)(hnta)(4)(N(3))(2)(H(2)O)(3)] (2), respectively, where hnta is 6-hydroxynicotinate, are described. Although both exhibit strong ferromagnetic coupling, discrete complex 2 exhibits long-range ferromagnetic ordering, while the very similar 1D system 1 does not. Density functional calculations provided accurate J values and allowed rationalization of the ferromagnetic coupling in terms of the magnetic orbitals and spin densities.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin, China.
authors.forename: Yong-Fei
authors.initials: YF
authors.lastname: Zeng
authors.forename: Jiong-Peng
authors.initials: JP
authors.lastname: Zhao
authors.forename: Bo-Wen
authors.initials: BW
authors.lastname: Hu
authors.forename: Xin
authors.initials: X
authors.lastname: Hu
authors.forename: Fu-Chen
authors.initials: FC
authors.lastname: Liu
authors.forename: Joan
authors.initials: J
authors.lastname: Ribas
authors.forename: Jordi
authors.initials: J
authors.lastname: Ribas-Ariño
authors.forename: Xian-He
authors.initials: XH
authors.lastname: Bu