Synthesis, crystal structure and magnetic properties of two 3-D gadolinium complexes

Two new gadolinium coordination polymers, Gd(tci)(H2O)]center dot DMF center dot 2H(2)O ( 1) and [Gd(bci)(H2O)]center dot 2H(2)O(2) (H(3)tci = tri(2-carboxyethyl)isocyanurate, H(3)bci = bis(2-carboxyethyl)isocyanurate), have been synthesized under solvothermal conditions by the reaction of gadolinium nitrate and H(3)tci or H(3)bci with presence of DMF and H2O. 1 and 2 feature an interesting 3D metal-organic framework which contains infinite linear Gd-(mu-O)(2)-Gd chains in the structures. The carboxylate groups bridge two Gd(III) centers in mu(2)-carboxylato-kappa O-1:kappa O-1' and mu O-2;kappa O-2,O' patterns for 1 and mu O-2;kappa O-2,O' fashion for 2. The magnetic studies indicate that there exist antiferromagnetic interactions in 1 and ferromagnetic interactions in 2. The best fittings to the experimental magnetic susceptibilities gave J = -0.015 cm(-1), g = 1.98 for 1 and J = 0.055 cm(-1), g = 1.98 for 2.