Hydrogen-bonding organization of (4,4) coordination layers into a 3-D molecular architecture with channels clathrating guest molecules [Cu(tdc)(bpy)(H2O)](bpy) (tdc=thiophine-2,5-dicarboxylate; bpy=4,4′-bipyridine)

The hydrothermal reaction of Cu(OAc)2 · H2O with thiophene-2,5-dicarboxylic acid (H2tdc) and 4,4′-bipyridine (bpy) gave a copper(II) coordination polymer {[Cu(tdc)(bpy)(H2O)](bpy)}n (1), in which the (4,4) layers are assembled via strong hydrogen bonds between the aqua ligands and the uncoordinated carboxylate oxygen atoms into a porous 3-D molecular architecture with parallelogrammic channels. The guest bpy molecules reside in the channels, involving intermolecular C–H⋯N hydrogen bonds with the host framework, can be removed upon heating at reduced pressure.