Two-dimensional lanthanide-isophthalate coordination polymers containing right- and left-handed helical chains

Two novel lanthanide polymeric complexes, [Nd2(ip)3(H2O)2]n (1) and [Gd2(ip)3(H2O)2]n (2) (ip ¼ isophthalate) have been obtained by hydrothermal synthetic method. Single-crystal X-ray analyses reveal that they are isostructural polymers and comprise two-dimensional wave-like layers, in which Ln(III) ions are seven- and eight-coordinated and linked by ip ligands resulting in right- and left-handed helical chains. The wave-like layers are stacked with each other via hydrogen bonds to generate three-dimensional supramolecular architecture. q 2003 Elsevier B.V. All rights reserved.