Figure 1
Fragment of (I) (50% displacement ellipsoids and arbitrary spheres for the H atoms), showing the atom-labelling scheme and hydrogen-bonding interactions (dashed lines). Symmetry-generated hydrogen phosphite moieties are indicated by unshaded ellipsoids; symmetry codes are as in Table 2. Note how each roughly parallel pair of guanidinium N—H bonds (H3 + H5; H6 + H8; H4 + H7) hydrogen bonds to a different acceptor configuration. |