Cation-anion interactions in bis(±)trans-2-aminocyclohexylammonium tetrathiotungstate, 1,7-diazonia-4-aza-heptane tetrathiotungstate and 1,5-diazonia-9-aza-nonane tetrathiotungstate

The structures of the title complexes consist of tetrahedral tetrathiotungstate anions which are linked to the partially protonated organic ammonium cations with the aid of weak hydrogen bonding interactions. A comparative study of the structural features of several tetrathiotungstates is presented and the interactions between the organic ammonium cation and the tetrathiotungstate anion are discussed in terms of the magnitude of Δ, the difference between the longest and the shortest W-S bond distances.