Syntheses, Structures and Luminescent Properties of 2D and 3D Cadmium(II) Coordination Polymers Derived from Two Isomeric Perchlorinated Benzenedicarboxylates

The coordination polymers {[Cd(o-BDC-Cl-4)(H2O)(2)]center dot EtOH}(n) (1) and {[Cd(p-BDC-Cl-4)(DMF)]center dot H2O}(n) (2) (o-BDC-Cl-4 = tetrachlorophthalate and p-BDC-Cl-4 = tetrachloroterephthalate) were synthesized in different solvents using two isomeric tetrachlorinated benzenedicarboxylic acids. Complex 1 based on o-BDC-Cl-4 features an extremely rare 2D trinodal (3,4,6)-connected network constructed by the combination of 1D [Cd-H2O](n) chains and 1D [Cd-2(o-BDC-Cl-4)(2)](n) loop-like motifs. Complex 2 based on p-BDC-Cl-4 has a 3D framework and shows a uninodal 4-connected sra topology. Complexes 1 and 2 were characterized by elemental analyses, IR spectroscopy, single-crystal X-ray diffraction and thermogravimetric (TG) analyses. The photoluminescence of 1 and 2 were investigated in the solid state at room temperature.