Synthesis, structure and luminescence properties of lanthanide coordination polymers using in situ decarboxylation of a H3cppdc ligand

The hydrothermal reaction of Ln(NO3)(3)center dot 6H(2)O, 3-(4-carboxyphenyl)-2,6-pyridinedicarboxylic acid (H(3)cppdc) and N,N-dimethylformamide (DMF) gave a series of lanthanide coordination polymers n[NH2(CH3)(2)]center dot[Ln(cppc)(2)(H2O)(2)](n) (where: Ln = Ce (1), Pr (2), Nd (3), Sm (4), En (5), Gd (6), Tb (7), Dy (8), Ho (9) and Er (10); and H(2)cppc = 5-(4-carboxyphenyl)-2-pyridinecarboxylic acid). The H(2)cppc ligand was formed in situ via decarboxylation of the initial H(3)cppdc ligand under the hydrothermal reaction conditions. Complexes 1-10 that crystallized in the same C-2/c space group, exhibited similar 2D layered structures and assemble into 3D supramolecular networks via hydrogen bonding and pi-pi stacking interactions. In addition, the luminescence properties of complexes 4, 5, 7 and 8 were investigated. (C) 2014 Elsevier B.V. All rights reserved.