Hydrothermal synthesis and structural characterization of new lanthanide coordination polymers with pimelic acid and 1,10-phenanthroline

This paper presents three new lanthanide coordination polymers [Pr2(pim)3(phen)2(H2O)]n·3nH2O (1) (H2pim ¼ pimelic acid; phen ¼ 1,10-phenanthroline) and [Ln(Hpim)(pim)(phen)]n·1.5nH2O (Ln ¼ Nd, 2; Er, 3) prepared by the hydrothermal reaction. The structural details of complexes 1, 2 and 3 are reported. In complex 1, the Pr(III) ions are bridged by pim in three modes to form 2D layers. Adjacent layers are assembled by hydrogen bonds and p–p stacking between phen ligands into a 3D network. In complex 2, the Nd(III) ions are connected by pim and Hpim in two modes into 1D chains. Hydrogen bonding and p–p stacking between chains result in a 3D supramolecular structure. Single crystal X-ray diffraction analysis shows that complex 3 is isostructural with complex 2. q 2004 Elsevier B.V. All rights reserved