Synthesis, structures and magnetic properties of 1D to 3D coordinated polymers based on series of flexible sulfide ligands

Abstract

Five complexes [Mn 2O(L 1) 4] n ( 1), [Co(L 2)(H 2O) 2] n ( 2), [Co(L 3) 2(H 2O) 2] n ( 3) and [Co(L 4) 2(4,4′-bpy)(H 2O)] n ( 4) were obtained by using flexible organic ligands HL 1, HL 2, HL 3, and HL 4 in hydrothermal systems with cobalt, copper and manganese salts respectively (HL 1 = 2-(4-pyridylmethylthio)benzoic acid, HL 2 = 4-(4-pyridylmethylthio)benzoic acid, HL 3 = 2-(3-pyridylmethylthio)benzoic acid, HL 4 = 4-(2-pyridylmethylthio)benzoic acid). The five complexes have been characterized by X-ray single crystal diffraction, FT-IR spectrum and elemental analysis. Complex 1 is assembled to a 3D porous framework with Mn 2O units as nodes. Complex 2 shows 2D layer networks comprised of six-coordinated Co 2+ centers and L 2 − anionic ions. Complexes 3 and 4 have different 1D double or single chain structures. Various non-covalent bonds such as hydrogen bonds, π⋯π interactions, H-bond grids and S⋯S weak interactions lead to interesting supramolecular frameworks. DC (direct current) temperature dependent magnetic susceptibilities suggest weak antiferromagnetic behaviors exist in 1, and single ion paramagnetic along with spin-orbit coupling behavior dominate in 3 and 4.