Interwoven coordination polymers sustained by tautomeric forms of the bridging ligand

Abstract

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-NC₅H₄CH₂NC(OH)C(OH)NCH₂C₅H₄N-3. In each case, the bridging ligands are threaded through 28-membered rings mediated by O–H⋯O hydrogen bonding. Hydrogen bonding interactions between the rings and threading molecules, i.e. O–H⋯O_carbonyl or O–H⋯N_imine, are dependent on the tautomeric form of the threading molecules.