Direction of unusual mixed-ligand metal–organic frameworks: a new type of 3-D polythreading involving 1-D and 2-D structural motifs and a 2-fold interpenetrating porous network

The reaction of CuII or CdII acetate with mixed ligands terephthalic (tp) and 3,5-bis(4-pyridyl)-4-amino-1,2,4-triazole (bpt) under the same conditions affords two unusual metal–organic frameworks, in which 1 represents a new type of polythreaded supramolecular architecture consisting of distinct 1-D and 2-D coordination polymers within one crystal, however, 2 has an interpenetrating porous network with two similar laterally interlocking 2-D (4,4) layers.