Synthesis, structures and magnetic properties of two self-assembly uniform nets (10,3), containing three-connected nodes

摘要

Two three-dimensional (3D) coordination polymers {[NaFe(diPic)(2)(H2O)(2)]} (1) and {[NaCr(dipic)(2)(H2O)(2)]} (2) containing Fe5Na5 and Cr5Na5 mixed d-/s-block subunits were synthesized by the reactions of tridentate ligand H(2)dipic (pyridine-2,6-dicarboxylic acid) with Fe(ClO4)(3) center dot 6H(2)O or Cr(ClO4)(3) center dot 6H(2)O through the self-assembly process with sodium ions. The X-ray diffraction analyses reveal that both complexes have 3D (10,3) topology. Magnetic susceptibility measurements of both complexes in the temperature range of 2-300 K reveal the occurrence of weak antiferromagnetic interactions together with zero-field splitting effects. (c) 2006 Elsevier B.V. All rights reserved.