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 (1) and {[K(CH3CN)2][Cu(btdt) 2]}n (2) of diverse dimensionality based on a copper coordination complex [CuIII(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 (1) and (2) respectively. The crystal structures of (1) and (2) have been discussed in comparison with those of recently reported sodium coordination polymers {[Na(CH3OH) 4][Au(btdt)2]}n (3), [Na(DMF) 2][Au(btdt)2]}n (4) and {[Na(CH 3CN)2][Au(btdt)2]}n (5). Compounds (1) and (2) have additionally been characterized by routine spectroscopy including elemental analyses.