Figure 5
Three kinds of phosphate-pairing dimer, formed (a) by a pair of Ot—H⋯Oi hydrogen bonds in (I), (b) by a pair of Ot—H⋯Ot hydrogen bonds for molecules A in (III) and (IV), and (c) by a single Ot—H⋯Ot hydrogen bond for molecules B in (III). Dashed lines denote hydrogen bonds. H atoms not involved in hydrogen bonds have been omitted for clarity. |