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

Five complexes [Mn2O(L-1)(4)](n) (1), [Co(L-2)(H2O)(2)](n) (2), [Co(L-3)(2)(H2O)(2)](n) (3) and [Co(L-4)(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, HL3 = 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 Co2+ 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, pi center dot center dot center dot pi interactions, H-bond grids and S center dot center dot center dot 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. (C) 2011 Elsevier B.V. All rights reserved.