title: Three-dimensional 3d-4f polymers containing heterometallic rings: syntheses, structures, and magnetic properties.
abstract: Two novel three-dimensional (3D) 3d-4f mixed complexes [Ln(H(2)O)(4)][Ni(2)TTHA(SCN)(2)].H(3)O+ [Ln = Pr (1), Ce (2); H(6)TTHA = triethylenetetraaminehexaacetic acid], based on the building blocks of [Ni(2)TTHA(SCN)(2)](4-), were synthesized and characterized by X-ray crystal diffraction and magnetic properties. The single-crystal structures show that these complexes form a 3D framework, comprised of an unusual infinite one-dimensional chain based on heterometallic Ln2Ni2 rings. The temperature-dependent magnetic susceptibilities were analyzed by an approximate model, leading to g = 2.06. Delta = 2.83, zJ' = -0.6 cm-1 for complex 1 and g = 2.07, Delta = 1.00, zJ' = -0.5 cm(-1) for complex 2.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Ouyang
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Na
authors.initials: N
authors.lastname: Xu
authors.forename: Gong-Feng
authors.initials: GF
authors.lastname: Xu
authors.forename: Dai-Zheng
authors.initials: DZ
authors.lastname: Liao
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Yoshimura
authors.forename: Shi-Ping
authors.initials: SP
authors.lastname: Yan
authors.forename: Peng
authors.initials: P
authors.lastname: Cheng