Figure 3.

(a) View of the coordination environments of Zn center in 2 with labeling schemes. Symmetry codes: (A) − 1 + x, 1 + y, − 1 + z; (B) 1 + x, y, z; and (C) − 1 + x, 1 − y, − 1/2 + z; (b) View of the 2D (4,4) layer in 2; (c) View of the 2D bilayer structure in 2 looking down b-axis; (d) View of the 2D bilayer model in 2. Each single net represents a topology with a Schläfli symbol of 4⁴6²; (e) View of a 3D supramolecular framework in 2. Green dashed lines represent the hydrogen-bonded interactions. Atom color codes: Zn, cyan polyhedrons; O, red; N, blue; C, dark green and pink. All hydrogen atoms except those related to H-bonding interactions are omitted for clarity.