Inclusion of 4,4'-Bipyridine (γbpy) in Its Copper(II) Aqua Perchlorato Complex. Crystal Structure of [Cu( γbpy )(H2O)2(ClO4)2]n.( γbpy )n

An example of a 4,4'-bipyridine ( ?bpy ) clathrate in its copper(II) complex has been established. The compound, [Cu( ?bpy )(H2O)2(ClO4)2]n.( ?bpy )n, crystallizes in the monoclinic space group C2/c with a 16.651(3), b 11.089(2), c 14.360(3) ?, ß 116.45(3)°, V 2373.9(8)?3. The crystal structure comprises ?bpy -bridged linear polymeric [Cu( ?bpy )(H2O)2(ClO4)2]n chains, where the copper atom, located on a crystallographic twofold axis, is coordinated in an elongated octahedral environment by two nitrogen atoms of the bridging ?bpy ligands (Cu-N 1.998(4)?) and two water molecules (Cu-O 1.968(3)?) at the equatorial positions, and two perchlorate oxygen atoms at the axial positions (Cu-O 2.414(4)?). The chains are interconnected by hydrogen bonds between the aqua ligands and the uncoordinated perchlorate oxygen atoms to form two-dimensional layers with cavities each enclosing a ?bpy molecule. Hydrogen bonding between the aqua ligands and the nitrogen atoms of the solvate ?bpy molecules further extends the structure into a three-dimensional network in the solid.