CAJ | 학술논문

Two one-dimensional heterometallic coordination polymers {[CuEr(Gly)5(H2O)2](ClO4)5*H2O}n (1) and {[Cu2Gd2(Gly)10(H2O)4](ClO4)10*4H2O}n (2) (Gly = glycine) were synthesized and structurally and characterized magnetically. Complex 1 crystallizes in a triclinic space group of P1 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 P1 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 Gd3+ and Cu2+ ions in complex 2.