Hydrothermal synthesis, crystal structures and luminescent properties of two new Ln(III)-succinate (Ln=Eu, Tb) complexes exhibiting three dimensional networks

Two new coordination polymers, [Eu-2(L)(3)(H2O)(2)](n) 1 and {[Tb-2(L)(3)(H2O)(2)]center dot H2O}(n) 2, (H2L = succinic acid) have been synthesized by the reaction of H2L with nitrate salts of Eu(III) or Tb(III) under hydrothermal conditions. The X-ray diffraction analysis reveals that the two complexes are constructed by L bridging the chains of edge-sharing EuO8(H2O) or TbO8(H2O) polyhedra to form 3D network structure. 1 and 2 possess different topological structures due to the difference in the conformations of L. The solid photoluminescence of 1 and 2 was also investigated in room temperature. (c) 2005 Elsevier B.V. All rights reserved.