A unique polymeric coordination system that exhibits supramolecular isomerism within two dimensions

Cadmium nitrate and bitopic conformationally flexible linker 3,3′,5,5′-tetramethyl-4,4′-bipyrazole readily form two-dimensional layer polymers [Cd(Me4bpz)2(NO3)2]. Depending on conditions for crystallization the complex could afford two different net topologies that are based on combinations of metal-ligand quadrangles (44 net) and triangles/hexagons (3262 net) and provides a first example for supramolecular isomerism of flat 2D coordination polymers.