Solvothermal syntheses, structures, and physical properties of four new coordination compounds constructed from a bent dicarboxylate ligand

Four new coordination compounds, namely {[Cd(3)(L)(2)(mu(3)-OH)(2)(H(2)O)]center dot H(2)O}(n) (1), {Ni(L)(bipy)}(n) (2), {Cu(3)(L)(2)(bipy)(mu(2)-OH)(2)(DMF)(2)}(n) (3), and {Co(2)L(2)(H(2)L)(H(2)O)}(n) (4), have been synthesized by the solvothermal reaction of 4,4'-(hexafluoroisopropylidene) bis(benzoic acid) (H(2)L) with different transition metal ions in the presence of co-ligand 4,4'-bipyridine (bipy). Compound 1 displays a three-dimensional (3D) framework containing infinite bands constructed of heptanuclear cadmium clusters. In compound 2, [Ni(2)C(2)O(4)] secondary building units (SBUs) are linked by L(2-) ligands into a 1D ribbon, which are further assembled into a two-dimensional (2D) non-interpenetrated structure with {4(4).6(2)} topology. Compound 3 possesses a 3D framework with a new topology of {4(3)}(2){4(6).6(14).8(8)} net, while the structure of 4 is a duplicate interpenetrated 3D framework with {4(12).6(3)} net. Temperature-dependent magnetic studies reveal that 3 exhibits ferromagnetic coupling between adjacent Cu(II) ions. The photoluminescent property of 1 has been studied in the solid state at room