title: Structures and magnetic properties of ferromagnetic coupling 2D Ln-M heterometallic coordination polymers (Ln = Ho, Er; M = Mn, Zn).
abstract: Four new heterometallic coordination polymers have been successfully synthesized, namely, {[Ho(2)(HCAM)(6)Mn(3)(H(2)O)(12)].17.5H(2)O}(n) (1), {[Er(2)(HCAM)(6)Mn(3)(H(2)O)(12)].17.5H(2)O}(n) (2), {[Ho(2)(HCAM)(6)Zn(3)(H(2)O)(12)].26H(2)O}(n) (3), and {[Er(2)(HCAM)(6)Zn(3)(H(2)O)(12)].26H(2)O}(n) (4) (H(3)CAM = chelidamic acid). X-ray crystallographic studies reveal that coordination polymers 1-4 are isostructural and crystallized in the rhombohedral crystal system, space group R3. These compounds comprise a 2D honeycomb-type framework. A 2D water sheet is first found in 3 and 4, which exhibits a novel topological motif. The magnetic results for 1-4 show that ferromagnetic interactions take place between the Ho(3+)/Er(3+) and Mn(2+) ions within 1 and 2.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, P. R. China.
authors.forename: Hong-Ling
authors.initials: HL
authors.lastname: Gao
authors.forename: Bin
authors.initials: B
authors.lastname: Zhao
authors.forename: Xiao-Qing
authors.initials: XQ
authors.lastname: Zhao
authors.forename: You
authors.initials: Y
authors.lastname: Song
authors.forename: Peng
authors.initials: P
authors.lastname: Cheng
authors.forename: Dai-Zheng
authors.initials: DZ
authors.lastname: Liao
authors.forename: Shi-Ping
authors.initials: SP
authors.lastname: Yan