organic compounds
In the title compound, C6H16N22+·2C2H4O5P-, the cations lie across centres of inversion; in the anions, two of the H-atom sites have 0.50 occupancy. The anions are linked by short O-HO hydrogen bonds [OO 2.465 (3)-2.612 (3) Å and O-HO 165-171°] into sheets of alternating R(12) and R(28) rings, both of which are centrosymmetric; the cations lie at the centres of the larger rings linked to the anion sheet by N-HO hydrogen bonds [NO 2.642 (2) Å and N-HO 176°].
organic compounds
In the title compound, C4H12N22+·2C8H7O3-·2CH4O, the cations lie across centres of inversion and are disordered over two orientations with equal occupancy; there are equal numbers of (R)- and (S)-mandelate anions present (mandelate is -hydroxybenzeneacetate). The anions and the neutral water molecules are linked by O-HO hydrogen bonds [OO 2.658 (3) and 2.682 (3) Å, and O-HO 176 and 166°] into deeply folded zigzag chains. Each orientation of the cation forms two symmetry-related two-centre N-HO hydrogen bonds [NO 2.588 (4) and 2.678 (4) Å, and N-HO 177 and 171°] and two asymmetric, but planar, three-centre N-H(O)2 hydrogen bonds [NO 2.686 (4)-3.137 (4) Å and N-HO 137-147°], and by means of these the cations link the anion/water chains into bilayers.