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(a) View of the coordination environment of Zn center in 4 with labeling schemes. Symmetry codes: (A) 1 − x, 1 − y, 1 − z; (b) View of a wrinkled 2D network in 4 extending along the bc plane; (c) View of a 3D framework of 4 looking down the c-axis; (d) Schematic view of the six-connected pcu net of 4. Atom color codes: Zn, cyan; O, red; N, blue; C, dark green and pink. All H atoms are omitted for clarity.
