Syntheses, crystal structures and physical properties of two unusual 4d–4f heterometallic coordination polymers

Two novel heterometallic coordination polymers, [AgSm(pydc)2]·2H2O (1) and [AgTb(pydc)2]2·H2O (2) (H2pydc = pyridine-3,4-dicarboxylic acid), have been synthesized under hydrothermal conditions, and characterized by elemental analysis, IR, thermogravimetric analysis and single-crystal X-ray diffraction. Complexes 1 and 2 are isomorphous and exhibit 3D open framework heterometallic coordination polymer containing 1D channels occupied by lattice water molecules. To our knowledge, both compounds represent the rare examples of 3D open-framework 4d–4f heterometallic coordination polymers with open framework structure. Moreover, their luminescent and magnetic properties have also been investigated.