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

Abstract

Four new coordination compounds, namely {[Cd₃(L)₂(μ₃-OH)₂(H₂O)]·H₂O}_n (1), {Ni(L)(bipy)}_n (2), {Cu₃(L)₂(bipy)(μ₂-OH)₂(DMF)₂}_n (3), and {Co₂L₂(H₂L)(H₂O)}_n (4), have been synthesized by the solvothermal reaction of 4,4′-(hexafluoroisopropylidene)bis(benzoic acid) (H₂L) 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, [Ni₂C₂O₄] secondary building units (SBUs) are linked by L²⁻ ligands into a 1D ribbon, which are further assembled into a two-dimensional (2D) non-interpenetrated structure with {4⁴·6²} topology. Compound 3 possesses a 3D framework with a new topology of {4³}₂{4⁶·6¹⁴·8⁸} net, while the structure of 4 is a duplicate interpenetrated 3D framework with {4¹²·6³} 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 temperature.