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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-H...O hydrogen bonds [O...O 2.465 (3)-2.612 (3) Å and O-H...O 165-171°] into sheets of alternating R^2_2(12) and R^6_6(28) rings, both of which are centrosymmetric; the cations lie at the centres of the larger rings linked to the anion sheet by N-H...O hydrogen bonds [N...O 2.642 (2) Å and N-H...O 176°].

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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 [alpha]-hydroxy­benzene­acetate). The anions and the neutral water mol­ecules are linked by O-H...O hydrogen bonds [O...O 2.658 (3) and 2.682 (3) Å, and O-H...O 176 and 166°] into deeply folded zigzag chains. Each orientation of the cation forms two symmetry-related two-centre N-H...O hydrogen bonds [N...O 2.588 (4) and 2.678 (4) Å, and N-H...O 177 and 171°] and two asymmetric, but planar, three-centre N-H...(O)2 hydrogen bonds [N...O 2.686 (4)-3.137 (4) Å and N-H...O 137-147°], and by means of these the cations link the anion/water chains into bilayers.
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