Crystal structure and properties of a CuII coordination polymer with 2-D grid-like host architecture for the inclusion of organic guest molecule

In the presence of the guest molecule, 2,5-bis(3-pyridyl)-1,3,4-oxadiazole (bpo), the title complex {[Cu(bpy)2(H2O)2]·(ClO4)2·(bpo)·3H2O}n (1), was prepared from the reaction of Cu(ClO4)2·6H2O and 4,4′-bipyridine (bpy) in CH3CN–H2O mixture. 1 has a 2-D square-grid network structure. The square grids superpose on each other to form a channel framework, in which each layer consists of two pairs of shared edges, almost perfectly square plane with one CuII ion and a bpy at each corner and side, respectively. The square cavity has dimensions of 11.174×11.179 Å. One guest bpo molecule is clathrated in each hydrophobic host cavity and is further stabilized by hydrogen bonding and π–π stacking interactions. The thermogravimetric analysis (TGA) and magnetic properties of complex 1 are also reported.