Novel HgII and MnII supramolecular complexes with a versatile building block 5-(4-pyridyl)-1,3,4-oxadiazole-2-thiolate involving in situ ligand formation

Abstract Reaction of potassium N ′-(pyridine-4-carbonyl)-hydrazinecarbodithioate ([K + (H 2 L ) − ]) with Hg II or Mn II inorganic salt in the presence of 1,10-phenanthroline (phen) or 4,4′-bipyridine (bipy), yields complexes [Hg(pyt) 2 (phen)] ( 1 ) and {[Mn(pyt) 2 (H 2 O) 2 ]·(bipy)·(H 2 O) 2 } n ( 2 ), in which the pyt ligand (Hpyt = 5-(4-pyridyl)-1,3,4-oxadiazole-2-thiol) is obtained by in situ ligand formation from the acyclic precursor [K + (H 2 L ) − ]. Single crystal X-ray diffraction suggests that the pyt anionic ligands in 1 and 2 behave as thiolate and thione isomers, respectively, and display S - and μ- N pyridyl , N oxadiazole -binding fashions. Complex 1 shows a 1-D fishbone-like supramolecular array via strong aromatic stacking interactions between the discrete mononuclear coordination motifs, whereas 2 has a 2-D layered host coordination framework with the inclusion of bipy and water guests in the cavities.