Two coordinated-solvent directed zinc(II) coordination polymers with rare gra topological 3D framework and 1D zigzag chain

Two novel coordination polymers [Zn2(tfbdc)2(DMF)2(EtOH)]n (1) and [Zn(tfbdc)(MeOH)4]n (2) have been prepared by reactions of Zn(NO3)2·6H2O, tetrafluoroterephthalatic acid (H2tfbdc), and hexamethylenetetramine (hmt) in their respective solvent systems. Complex 1 shows a 3D pillar-layered framework with rare (3,5)-connected gra topology, while 2 has a 1D zigzag chain structure, with the interchain hydrogen-bonding interactions resulting in the formation of a 3D network. The results reveal that the coordinated-solvent plays a subtle and important role in the assembly procedure. Photoluminescent property of the complexes has also been investigated.