Structural details of 2. (a) Coordination environments of Zn1 and Zn2. Symmetry operations: A: 1 + x, y, z; B: x, −y, −0.5 + z; C: x, 1 −y, 0.5 + z. (b) (4,4) grid showing the rhombus shape formed by Zn2(bdc)2. (c) View of the bpeb orientation and pcu topology. (d) Packing structure showing the twofold interpenetration. For clarity, the disorder and the hydrogen atoms are not shown.