Interwoven coordination polymers sustained by tautomeric forms of the bridging ligand

Supramolecular interwoven double chains are found in two isomeric zinc thiolate complexes which differ in terms of the tautomeric forms of the bridging ligands, i.e. 3-NC5H4CH2N(H) C(=O)C(=O)N(H)CH2C5H4N-3 or 3-NC5H4CH2N=C(OH)C(OH)=NCH2C5H4N-3. In each case, the bridging ligands are threaded through 28-membered rings mediated by O-H center dot center dot center dot O hydrogen bonding. Hydrogen bonding interactions between the rings and threading molecules, i.e. O-H center dot center dot center dot O-carbonyl or O-H center dot center dot center dot N-imine, are dependent on the tautomeric form of the threading molecules.