Syntheses, Crystal Structures, Thermal and Photoluminescent Properties of Four Coordination Complexes with a Heterocyclic Thioether Carboxylate Ligand

A series of transition metal coordination complexes, {[Cu(3‐Sptta) 2 ] · 1/2H 2 O} n ( 1 ), {[Cd(3‐Sptta) 2 ] · 1/2H 2 O} n ( 2 ), [Zn(3‐Sptta) 2 (H 2 O) 4 ] ( 3 ), and [Co(3‐Sptta) 2 (H 2 O) 4 ] ( 4 ) were synthesized under solvothermal and solvent evaporation conditions using the newly designed heterocyclic N/NS carboxylate ligand [2‐(3‐pyridyl)‐1,3,4‐thiadiazole‐5‐]‐thio‐acetate (3‐Sptta) as a main building block. Their structures were determined by single‐crystal X‐ray diffraction analyses and further characterized by elemental analyses and IR spectroscopy. The four complexes exhibit structural diversity: complexes 1 and 2 exhibit similar 2D “wave‐like” double‐layer framework with two shares of mutually parallel left‐handed and right‐handed helical chains, whereas 3 and 4 present mononuclear structures. Moreover, the thermal stabilities of complexes 1 – 4 were investigated. The luminescent properties of complexes 2 , 3 and the free ligand were also studied.