Venu R. Vangala

Proton transfer and N(+)–H⋯S(−) hydrogen bonds in the crystal structure of 4-aminothiophenol

4-Aminothiophenol exists as 4-ammonio-1-benzenethiolate in the solid and liquid state. The crystal structure is characterised by a tetrahedral beta-As type network which is the driving force for the proton transfer.

A 1:1 molecular complex of bis(4-aminophenyl) disulfide and 4-aminothiophenol.

The centrosymmetric crystal structure of the title complex, C(12)H(12)N(2)S(2).C(6)H(7)NS, is built up of dimers of the constituent molecules and stabilized by a herring-bone geometry between the phenyl rings. The structure reveals an N-H...N-H...N-H...S co-operative hydrogen-bonded chain, and C-H...S and N-H...pi hydrogen bonds. The S-H group forms an uncommon S-H...pi interaction.

Interplay of phenyl–perfluorophenyl stacking, C–H⋯F, C–F⋯π and F⋯F interactions in some crystalline aromatic azines

Analysis of phenyl-perfluorophenyl stacking synthon, C-H...F, C-F...pi interactions, and F...F tetramer in three closely related azine crystal structures shows the dominance of Ar-ArF synthon while other interactions are turned on/off depending on the H/F stoichiometry in the molecule.