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) . 3H(2)O}(n) (1), was prepared from the reaction of Cu(ClO4)(2) . 6H(2)O 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 Cull ion and a bpy at each corner and side, respectively. The square cavity has dimensions of 11.174 x 11.179 Angstrom. One guest bpo molecule is clathrated in each hydrophobic host cavity and is further stabilized by hydrogen bonding and pi-pi stacking interactions. The thermogravimetric analysis (TGA) and magnetic properties of complex 1 are also reported. (C) 2002 Elsevier Science B.V. All rights reserved.