Figure 3
The one-dimensional chains of hydrogen bonds (dashed lines) between the ammonium heads and the I− anions in (II). Atoms marked with an asterisk (*), hash (#), ampersand (&), `at' sign (@) or double prime (′′) are at the symmetry positions (1 − x, 1 − y, 1 − z), (x, y, 1 + z), (1 − x, 1 − y, −z), (x, y, −1 + z) and (1 − x, 1 − y, 2 − z), respectively. |