A Novel Three-Dimensional Network Isophthalato-Bridged Lanthanide Complex: {Ln[C 6 H 4 (COO - ) 2 -1,3](CH 3 COO - )(H 2 O) 2 }·H 2 O.

The three-dimensional network of lanthanide (III) complexes with isophthalato (IPT) ligand, (Eu[C 6 H 4 (COO - ) 2 -1,3](CH 3 COO - )(H 2 O) 2 }·H 2 O 1 and {Sm[C 6 H 4 (COO - ) 2 -1,3](CH 3 COO - ) (H 2 O) 2 } H 2 O 2 , has been prepared by the hydro(solvo)thermal reaction of Eu(C1O 4 ) 3 ·6H 2 O or Sm(C1O 4 ) 3 ·6H 2 O, 1,3-dicyanobenzene and acetic acid in the presence of ethanol and H 2 O. In the reaction, 1,3-dicyanobenzene was hydrolyzed to give IPT ligand. Single crystal x-ray analysis revealed that crystals 1 and 2 are isomorphous with the isostructural {M[C 6 H 4 (COO - ) 2 -1,3](CH 3 COO - )(H 2 O) 2 }·H 2 O unit. In 1 and 2 , IPT acts as a bridging ligand to connect three adjacent metal atoms, forming a network like an undulating sheet paralleling the bc plane. The carboxylate from acetate bridges two adjacent metal atoms in a tridentate mode between the different sheets to extend the structure into a three-dimensional network. [ABSTRACT FROM AUTHOR]