Divalent Zinc, Cobalt, and Cadmium Coordination Polymers of a New Flexible Trifunctional Ligand: Syntheses, Crystal Structures, and Properties

Three metal­(II) coordination polymers [ZnL­(H2O)]n (1), [Co2L2(H2O)]n (2), [Cd2L2(H2O)]n (3) (H2L = 1-(pyridin-4-ylthio)­benzene-2,4-dioic acid) have been synthesized under hydro­(solvo)­thermal conditions and characterized by single-crystal X-ray diffraction, IR spectral, and thermogravimetric analyses. Though all three complexes have the same Schläfli symbol (4·62)2(42·610·83), under the inducement effect of the metal ions, 1 and 2 exhibit a distorted rtl topology, whereas 3 exhibits a sit net. For classification of the interpenetration network, complexes 1–3 belong to Class Ia, Class IIa, and Class IIa of 2-fold interpenetration, respectively. Furthermore, the solid luminescent properties of 1 and 3 at room temperature, and variable temperature magnetic susceptibilities of complex 2 were also studied.