Solvent-regulated Assembly of 1D and 2D CdIICoordination Polymers with Tetrafluorophthalate: Syntheses, Structures and Properties

Two new coordination polymers [Cd(1,2-BDC-F4)(H2O)2(py)]n (1) and {[Cd(1,2-BDC-F4)(H2O)2](DMF)}n (2) were prepared from the vapor diffusion reactions of CdII acetate with tetrafluorophthalic acid (1,2-H2BDC-F4) under different solvent atmospheres, and structurally characterized by single-crystal diffraction technique. Both complexes reveal polymeric coordination architectures. Complex 1 is a one-dimensional (1D) double chain, which crystallizes in the space group, P212121. In 1, each CdII ion is hexacoordinate by five oxygen atoms from two terminal water and three 1,2-BDC-F4 anions with a μ3-bridging mode, as well as one nitrogen donor from one pyridine molecule. Complex 2 is a two-dimensional (2D) layered network, which crystallizes in the P\bar{1} space group. In 2, each CdII ion is heptacoordinate by seven oxygen atoms from two terminal water and four 1,2-BDC-F4 anions with a μ4-bridging mode. The results clearly suggest that the judicious choice of solvent systems does play a critical role in the construction of coordination frameworks with distinct dimensionality and connectivity. Their spectroscopic, thermal, and fluorescence properties have also been investigated.