title: Crystal structures and magnetism of infinite alternating chains arranged by paddle-wheel dinuclear copper and mononuclear copper units.
abstract: The crystal structures and magnetic properties of two novel polyclusters {[Cu(3)(tci)(2)(H(2)O)(2)]·12H(2)O}(n) (1) and {[Cu(3)(tci)(2)(H(2)O)(2)]·6H(2)O}(n) (2) (tci = tris(2-carboxyethyl) isocyanurate) are investigated. The X-ray crystallographic analysis reveals that they contain interesting infinite alternating chains of dinuclear paddle-wheel copper and mononuclear copper units arranged in ABBA magnetism exchange mode. Variable-temperature magnetic susceptibility measurements on the two polyclusters show strong antiferromagnetism couplings between copper ions with exchange interactions J = -181.4 cm(-1), zj' = -0.31 cm(-1) for 1, J = -170 cm(-1), zj' = -0.42 cm(-1) for 2. With the aim of studying magneto-structural correlation, we synthesized a three-dimensional polymer [Cu(3)(tci)(2)(py)(4)(H(2)O)(2)](n) (3) based on isolated dinuclear cluster and mononuclear copper units. Fitting the susceptibility data yielded J = -176.1 cm(-1), zj' = -0.084 cm(-1) for 3.
authors.affiliation: Department of Chemistry, Zhengzhou University, Henan, 450052, PR China.
authors.forename: Huijun
authors.initials: H
authors.lastname: Li
authors.forename: Hongchang
authors.initials: H
authors.lastname: Yao
authors.forename: Erpeng
authors.initials: E
authors.lastname: Zhang
authors.forename: Yanyuan
authors.initials: Y
authors.lastname: Jia
authors.forename: Hongwei
authors.initials: H
authors.lastname: Hou
authors.forename: Yaoting
authors.initials: Y
authors.lastname: Fan