New multicomponent organic semiconductors based on ET with polymeric Anions: α″-(ET)2N(CN)2·2H2O and α‴-(ET)6(NO3)3·2C2H5O2N3

Abstract

New multicomponent radical cation salts derived from bis(ethylenedithio)tetrathiafulvalene (ET) were prepared: bis(ethylenedithio)tetrathiafulvalene dicyanamide dihydrate α″-(ET)2N(CN)2·2H2O and bis-(ethylenedithio)tetrathiafulvalene nitrate α‴-(ET)6(NO3)3·2C2H5O2N3 containing two biuret molecules (C2H5O2N3). The crystal structures of the compounds were determined, and their conducting properties were examined. Both salts have layered structures in which radical cation layers alternate with nonconducting anionic layers. The radical cation layers in the salts α″-(ET)2N(CN)2·2H2O and α‴-(ET)6(NO3)3·2C2H5O2N3 are packed in the α″ and α‴ fashion, respectively. Anionic layers consist of polymeric chains formed by hydrogen bonding between [N(CN)2]− anions and water molecules in α″-(ET)2N(CN)2·2H2O or between NO−3 anions and biuret molecules in α‴-(ET)6(NO3)3·2C2H5O2N3. Both salts show semiconductor conductivity.