A contribution to the crystal chemistry and topology of organic thiosulfates: bis(1-methylpiperazinium)·SO·HO versus 1-methylpiperazinediium·SO·3HO.

Single crystals of two new compounds, (CHN)SO·HO (1) and (CHN)SO·3HO (2), were isolated from the reaction products of 1-methylpiperazine, sulfuric acid, and barium thiosulfate in aqueous media. The crystal structures have been determined by single-crystal X-ray diffraction. In agreement to the previous observations, the organic template may contribute to the formation of thiosulfates both as mono- and diprotonated species, but this is the first case where both products are reported for the same organic compound. In both structures 1 and 2, complex nets of hydrogen bonds involve all cations, anions and water molecules. Comparisons are made to the structures of other thiosulfates containing mono- or diprotonated diamine species.