Porous CoII and NiII coordination polymers based on 5-(4-pyridyl)-1,3,4-oxadiazole-2-thiol for various solvent inclusion

The reactions of 5-(4-pyridyl)-1,3,4-oxadiazole-2-thiol (Hpyt) with typical octahedral metal ions (CoII and NiII) under different conditions generate a series of porous coordination polymers with the general formula of {[M(pyt)2(H2O)2] · (solvents)}n. In all these complexes, the versatile pyt anionic ligand behaves as the thioamide isomer with the μ-Npy,Noxa binding fashion, as confirmed by the X-ray crystallographic studies. Generally, the pyt linkers connect the metal centers to afford uniform 2-D grid-like host coordination frameworks, which stack in a parallel manner to engender the final 3-D crystalline lattices with 1-D open channels. Especially for CoII, different reactive routes and media lead to the productions of four analogous compounds with the inclusion of varied guest solvates, in one of which unusual water clusters are observed.