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

Five complexes [Mn₂O(L₁)₄]_n (1), [Co(L₂)(H₂O)₂]_n (2), [Co(L ₃)₂(H₂O)₂]_n (3) and [Co(L₄)₂(4,4′-bpy)(H₂O)]_n (4) were obtained by using flexible organic ligands HL₁, HL₂, HL₃, and HL₄ in hydrothermal systems with cobalt, copper and manganese salts respectively (HL₁ = 2-(4-pyridylmethylthio) benzoic acid, HL₂ = 4-(4-pyridylmethylthio)benzoic acid, HL ₃ = 2-(3-pyridylmethylthio)benzoic acid, HL₄ = 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 Mn₂O units as nodes. Complex 2 shows 2D layer networks comprised of six-coordinated Co ²⁺ centers and L₂^- 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.