Hydrothermal synthesis, crystal structures, and properties of Co II and Ni II supramolecular complexes with 2,4,6-trimethyl benzoate and 4,4′-bipyridyl

Abstract

Two new coordination complexes, viz. [Co(tmb) 2(4,4′-bpy) 2(H 2O) 2](Htmb) 2 ( 1) and {[Ni(tmb) 2(μ-4,4′-bpy) 2(H 2O) 2](4,4′-bpy)} n ( 2), have been hydrothermally synthesized by reaction of the corresponding metal acetate with 2,4,6-trimethylbenzoic acid (Htmb) and 4,4′-bipyridyl (4,4′-bpy). X-ray single-crystal diffraction suggests that complex 1 represents a discrete mononuclear species in which the central metal ion is coordinated by the terminal carboxylate moiety and the 4,4′-bipyridyl ligand. The crystal structure of complex 2 reveals a 1D chain coordination polymer in which the Ni(II) ions are connected by the bridging 4,4′-bipyridyl ligands. In both cases, the coordination arrays are further extended via hydrogen bonding interactions to generate 3D supramolecular networks. Complexes 1 and 2 have also been characterized by spectroscopic (IR and UV/Vis), thermal (TGA) and magnetic susceptibility measurements. In addition, both complexes exhibit antimicrobial activity.