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

摘要

Two new coordination complexes, viz. [Co(tmb)2(4,4'-bpy)(2)(H2O)(2)](Htmb)(2) (1) and ([Ni(tmb)(2)(mu-4,4'-bpy)(2)(H2O)(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 I 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. (C) 2008 Elsevier Ltd. All rights reserved.