3d-4f Coordination Polymers Containing Alternating EE/EO Azido Chain Synthesized by Synergistic Coordination of Lanthanide and Transition Metal Ions

A series of M-II-Ln(III) azido-containing complexes: [LnNi(2)(IN)(5)(N-3)(2)(H2O)(3)] center dot 2H(2)O (Ln = Nd-III (2), Eu-III (3), Sm-III (4), La-III (5)) and [GdCu2(IN)(5)(N-3)(2)(H2O)(3)]center dot 2H(2)O (6) have been prepared hydrothermally by using isonicotinate (IN) and azide as bridging ligands with the strategy of synergistic coordination. Their structures have been determined by single-crystal X-ray diffraction analyses and their magnetic properties have been probed by changing the Ln(III) metal ions and the 3d ions. All of them crystallize in the monoclinic space group P2(1)/n. The structural analyses revealed that alternating EE/EO azido-M chain and RCOO-/Ln chain are presented in these compounds due to coordination synergy. The variable temperature magnetic susceptibility studies demonstrate that the magnetic properties of the complexes are dominated by the 3d metal ions.