Solvothermal syntheses, crystal structures, thermal and photoluminescent properties of four coordination polymers constructed from mercapto-thiadiazole ligand

Abstract

By combining one kind of N-/S-containing rigid ligand with metal ions Zn(II), Co(II), Ni(II) and Pb(II), we have solvothermally synthesized four mercapto-thiadiazole based coordination polymers: [Zn(3-ptt)2]n (1), [Co(3-ptt)2]n (2), [Ni(3-ptt)2]n (3) and [Pb(3-ptt)2] (4) (3-pttH=2-(3-pyridine)-1H-1,3,4-thiadiazole-5-thioketone). As a result of various coordination modes of the versatile 3-ptt, four complexes exhibit structural diversity. 1 and 2 exhibit similar novel twofold interpenetrating 3D supramolecular framework with 66-dia topology embodying two types of left- and right-handed single-helical chains, 3 displays an attractive interconnected 1D chain structure and 4 presents a mononuclear structure. We also investigated their thermogravimetric (TG) and luminescent properties. Complexes 1 and 4 show different luminescence properties in solid state at room temperature and may be suitable as a candidate for potentially photoactive material.