A New Mixed-Valent Copper Cyanido Complex and a New Copper(II) Acetato Complex, Prepared with an Ionic Liquid

摘要

When copper(II) acetate is treated with the ionic liquid n-butylmethylimidazolium cyanide (BMIm-CN), in ethanol solution, two new copper coordination compounds are obtained. (BMIm)(2)[Cu-4(CN)(7)] comprises a 3D coordination polymer of cyanide bridged copper ions. This anionic coordination polymer contains Cu-I as well as Cu-II ions, i.e. it is a mixed-valent compound. The polymer can be described as honeycomb structure with the BMIm(+) cation being located in the cages. The second compound obtained from the chemical reaction is (BMIm)[Cu-2(OAc)(5)][Cu(OAc)(2)(H2O)](2)center dot C2H5OH, which can be described as double-salt. The first unit (BMIm)[Cu-2(OAc)(5)] contains paddle wheel copper(II) acetato moieties, which are bridged by additional acetato ligands and form infinite chains. The second part of the double salt is the neutral, [Cu(OAc)(2)(H2O)](2) complex. These two parts as well as the co-crystallized ethanol molecule are connected through a network of hydrogen bridges.