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Figure 2 Projection down the a axis of the lattice of Ph4P+HC2O4−, showing the hydrogen-bonded chains of HC2O4− anions (labelled OxC and OxD) propagating parallel to the b axis. The zig-zag chains of cations are also evident. H atoms have been omitted for clarity. Symmetry operators: (i) 1-x, 1-y, 1-z; (ii) 1-x, 1-y, −z; (iii) −x, 1-y, 1-z; (iv) x, 1 + y, z; v −x, −y, 1-z. |