Structural and Thermal Investigations of Co(II) and Ni(II) Coordination Polymers Based on biphenyl-4,4'-dioxydiacetate Linker.

Two coordination polymers, [Co(µ-L)(HO)] () and [Ni(µ-L)(HO)] (), were solvothermally assembled from the corresponding metal(II) chlorides and biphenyl-4,4-dioxydiacetic acid (HL) as a flexible dicarboxylate linker. The cobalt(II) compound featured a layer-pillared 3D metal-organic network with a cds topology, while the nickel(II) derivative represented a linear chain 1D coordination polymer with a 2C1 topology. The µ and µ-L linkers exhibited different denticity and coordination modes in the synthesized compounds, thus contributing to their structural diversity. The dimensionality of and had an influence on their thermal stability and decomposition processes, which were investigated in detail by TG-DSC and TG-FTIR methods. Thermal decomposition products of coordination polymers were also analyzed by PXRD, confirming the formation of CoO/CoO and NiO as final materials. The obtained compounds broaden a family of coordination polymers assembled from flexible dicarboxylate linkers.