Structure and properties of silver sulfate complexes derived from dipyridyl methylthio ligands with secondary donor site

Dipyridyl sulphide ligands 4-(pyridin-4-ylmethylthio)pyridine (abbreviated as L1) and 3-(pyridin-4-ylmethylthio)pyridine (abbreviated as L2) have been designed and used as mu-(N,N)-bridging linkages to construct coordination polymers with free -S-CH2 groups as secondary donor sites. By use solvent control method, coordination polymers {[Ag3SO4(L1)(3)](Cl)center dot 4.5H(2)O}(infinity)(1), {[Ag2SO4(L1)(2)]center dot 6H(2)O.2CH(3)OH}(infinity)(2), {[Ag2SO4(L2)(2)]center dot H2O)(infinity)(3) and {[Ag-4(SO4)2(L2)(4)]center dot 5H(2)O}(infinity)(4) with different architectures were obtained. Complexes 1, 3 and 4 feature 1D channel with different sizes and structures. Complex 1 exhibits guest exchange by THE and 1,4dioxane, and Hg2+ sorption ability from solution due to its relative larger channel and available bonding sites of -S-exposed to the channel region. All complexes have been characterized through single-crystal and powder Xray diffraction (PXRD), FT-IR spectra, X-ray photoelectron spectroscopy (XPS), elemental and thermogravimetric analyses. The guest exchange and Hg2+ sorption were monitored and identified, and the structure property relationship of coordination polymers 1-4 are discussed.