A polythreading coordination array formed from 2D grid networks and 1D chains

The reaction of ZnCl2 or Zn(NO3)(2) with the flexible ligand 1,3-bis (1,2,4-triazol-1-yl) propane (btp) and 1,4-benzenedicarboxylate (1,4-bdc) affords two coordination polymers, in which 1 represents a new type of entanglement that only a half of the loops of 2D networks are polythreading by 1D chains containing alternating rings and rods, however, 2 has a special 2D (6,3) network, with six Zn(II) atoms at six corners and four 1,4-bdc and two double btp at six edges.