Hydrothermal synthesis and structure of new lanthanide coordination polymers with dicarboxylic acid and 1,10-phenanthroline

[Ln(oba)(Hoba)(phen)]n (Ln ¼ Er (1), Yb (2)) and [Er2(bpndc)3(phen)]n (3) were obtained by hydrothermal reaction of LnCl3 with 4,40- oxybis(benzoic acid) (H2oba), benzophenone-4, 40-dicarboxylic acid (H2bpndc) and 1,10-phenanthroline (phen), respectively, and characterized by single-crystal X-ray diffraction. The crystal structure reveals that 1 and 2 are isomorphous. In the asymmetric unit of 1 and 2, each Ln(III) center is eight-coordinated. 1D chains with two types of rings are formed by Ln(III)–O coordination bond, while 2D network and 3D supramolecular structures are built up by hydrogen bonds and p–p stacking, respectively. Complex 3 is a 3D structure composed of two crystallographically independent Er(III) atoms through bridging bpndc ligands. q 2004 Elsevier B.V. All rights reserved.