Fig. 2: Coordination polymers with/without twisted conjugation.

a The twisted dihedral angle and c the coplanar conjugation between Cu(II)–carboxylate coordination plane and neighbouring phenyl plane of Cu–Twisted and Cu–Planar, respectively. The insets exhibited the diode-like (for a) and molecular wire-like (for c) electron transfer routes. The 3D porous networks of b Cu–Twisted and d Cu–Planar. Cu cyan, C grey, O red, N blue, H atoms were omitted for clarity.