A New Highly Thermally Stable Co(II)-coordination polymer with Semi-flexible Bis(Imidazole) Directed Secondary Building Unit: Solvothermal Synthesis and Structure

Abstract

A new thermally highly stable 2D coordination polymer, formulated as [Co(μ6-abtc)0.5(μ-obix)]n (abtc = dioxygenated form of 3,3′,5,5′-azobenzenetetracarboxylate) obtained employing thesemi-flexible 1,2-bis(imidazole-1-ylmethyl)benzene (obix) linker in hydro(solvo)thermal method.The complex was characterized by various techniques such as IR spectroscopy, elemental analysis,single crystal and powder crystal analysis. Crystallographic study of complex 1 reveal that twometal(II) ions are linked by O atoms of carboxylate groups of abtc ligand to build paddle-wheel SBU(secondary building unit). These SBUs are stabilized by the connection of obix ligand. The Co(II) ionsare μ6-bridged by hexadentate abtc ligand to generate 2D polymer layers with 3,4-connected binodalnet (point symbol ${4.62}2{42.62.82})$ and topological type is 3,4L13. Thermal analysis shows thatcomplex 1 thermally stable up to 401 °C.