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首页> 中文期刊> 《中国稀土学报：英文版》 >Syntheses and Structures of Two Heteronuclear Complexes with Glycine {CuEr(Gly)_5(H_2O)_2(ClO_4)_5·H_2O}_n and {Cu_2Gd_2(Gly)_10 (H_2O)_4(ClO_4)_10·4H_2O}_n

Syntheses and Structures of Two Heteronuclear Complexes with Glycine {CuEr(Gly)_5(H_2O)_2(ClO_4)_5·H_2O}_n and {Cu_2Gd_2(Gly)_10 (H_2O)_4(ClO_4)_10·4H_2O}_n

         
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Two one dimensional heterometallic coordination polymers {[CuEr(Gly) 5(H 2O) 2](ClO 4) 5·H 2O} n (1) and {[Cu 2Gd 2(Gly) 10 (H 2O) 4](ClO 4) 10 ·4H 2O} n (2) (Gly = glycine) were synthesized and structurally and characterized magnetically. Complex 1 crystallizes in a triclinic space group of P 1 with a =1.1769(2) nm, b =1 2289(3) nm, c = 1.4452(3) nm, α = 89.90(3)°, β = 71.88(3)°, γ = 62.15(3)°, and Z =2. The carboxyl groups of glycine molecules take two coordination modes. The first one acts as a bidentate bridging ligand only. The second is a tridentate bridge that coordinates to three different metal ions. Each erbium ion is eight coordinated, taking a distorted square antiprism arrangement. The copper ion has a square pyramidal coordination polyhedron. The topological structure of complex 2 is similar to complex 1, but there are some disparities in the bond lengths and bond angles. It is also triclinic space group of P 1 with a = 1.2479(3) nm, b = 1.4489(3) nm, c =2.0885(4) nm, α = 109.56(3)°, β = 93.75(3)°, γ = 93.54(3)°, and Z =2. Variable temperature susceptibility measurements show that there is a weak ferromagnetic interaction between the Gd 3+ and Cu 2+ ions in complex 2.

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