Figure 3 H-bonding arrangement between the ammonium cations and the host framework [symmetry codes: (ii) -x + y - 1, -x, z; (iii) -y - 1, x-y, z; (iv) -x + y - 1, -x - 1, z; (v) -y, x-y, z; (vii) x - 1, y - 1, z; (viii) x-y, x, -0.5 + z, (ix) y - 1, -x + y - 1, -0.5 + z; (x) -x - 1, -y, -0.5 + z].  [article HTML]