Synthesis and structural characterization of potassium coordination polymers based on a copper-bis(dithiolato) complex: Role of coordinating solvents and counter cation

Abstract

We have synthesized two new potassium metal coordination polymers {[K(CH₃COCH₃)₃][Cu(btdt)₂]}_n(<b style="">1</b>) and {[K(CH₃CN)₂][Cu(btdt)₂]}_n (<b style="">2</b>) of diverse dimensionality based on a copper coordination complex [Cu^III(btdt)₂]¹⁻

({btdt}^2– = 2,1,3-benzenethiadiazole-5,6-dithiolate). Recrystallization of the dark brown solid, obtained from the reaction mixture of H₂btdt, KOH and CuCl₂·2H₂O in MeOH, from the coordinating solvents acetone and acetonitrile results in the formation of 3-D and 2-D extended networks in compounds (<b style="">1</b>) and (<b style="">2</b>) respectively. The crystal structures of (<b style="">1</b>) and (<b style="">2</b>) have been discussed in comparison with those of recently reported sodium coordination polymers {[Na(CH₃OH)₄][Au(btdt)₂]}_n(<b style="">3</b>), [Na(DMF)₂][Au(btdt)₂]}_n (<b style="">4</b>) and {[Na(CH₃CN)₂][Au(btdt)₂]}_n (<b style="">5</b>). Compounds (<b style="">1</b>) and (<b style="">2</b>) have additionally been characterized by routine spectroscopy including elemental analyses.