2D Ln III (Nd/La)-Ag I Heterometallic and Tm III Homometallic Coordination Polymers Based on Pyridine Dicarboxylate ­Ligands: 2D Ln III (Nd/La)-Ag I Heterometallic and Tm III Homometallic Coordination Polymers

Two 2D 4d-4f heterometallic coordination polymers, [LnAg(Py26DC)(2)(H2O)(3)]3H(2)O [Ln = Nd (1), La (2); H(2)Py26DC = pyridine-2,6-dicarboxylic acid], and one 2D lanthanide homometallic coordination polymer, [Ln(Py25DC)(ox)(0.5)(H2O)(2)] [Ln = Tm (3); H(2)Py25DC = pyridine-2,5-dicarboxylic acid; ox = oxalate], were synthesized and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction analysis. Both complexes 1 and 2 are isostructural and exhibit 3-connected 2D heterometallic layer structures with the Schlafli symbol of (8(2)10), whereas complex 3 represents an extended 2D homometallic network structure with (4,4) topology.