Abstract
The oxidative reactivity of some copper(II) compounds in acetonitrile was studied by the use of 2,2′-bithiophene (BT) as a testing compound. The reaction between copper(II) trifluoromethanesulfate (triflate) and BT yielded an electroconductive polythiophene triflate [(−C 4H 2S−)(CF 3SO 3) 0.2] n with a room temperature conductivity of 0.15 S cm −1, which was comparable to the conductivity of polythiophene perchlorate prepared by the reaction of copper(II) perchlorate with BT. In contrast, reactions between BT and copper(II) chloride or bromide provided halogen-substituted bithiophenes. The nitrate and trifluoroacetate did not react with BT. The reactions are strongly governed by solvation effects, which are dependent on the nature of anions in the copper(II) salts as well as on the solvent used.
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