Hydrothermal synthesis and crystal structures of three novel lanthanide coordination polymers with glutarate and 1,10-phenanthroline
摘要:
The first series of lanthanide coordination polymers with glutarate (glu) and 1, 10-phenanthroline (phen), [Nd-2(glu)(3)(phen)(2)](n) 1, [Tb(glu)(phen)Cl](n) 2 and [Ho(glu)(phen)Cl](n) 3, have been prepared by hydrothermal reaction and characterised by IR spectra and X-ray crystallography. In complex 1, there are two different conformations for glutarate ligands, the gauche- and anti-forms. Nd(III) ions are bridged by glutarate ligands in three modes to form 2D layer structure. Phen ligands coordinate to Nd(III) ions in chelating mode and protrude from the polymeric layer in two different directions. Two types of pi-pi interactions exist between two adjacent layers. In complex 2, Tb(III) ions are connected by glutarate ligands into 1D chain structure. Phen ligands coordinate to Tb(III) ions in chelating mode and locate at both sides of the chain. The C-(HO)-O-..., C-(HCl)-Cl-... weak hydrogen bonds and pi-pi stacking interactions between chains result in 3D supramolecular structure. Single-crystal X-ray diffraction analysis shows that complex 3 is isostructural with complex 2. (C) 2003 Elsevier Science B.V. All rights reserved.