فهرست نشریات علمی دسترسی آزاد ایران

A novel one-dimensional Ag(I) coordination polymer based on a sulfur-donor ligand, namely {[Ag2(µ-L)(µ,µ2-L)(µ2-L)][(PF6)2]}n (Ag-CP), was successfully obtained using a branched-tube strategy. The solid-state structure was resolved by single-crystal X-ray diffraction, revealing a triclinic lattice (Pī) composed of cationic polymeric chains featuring eight-membered Ag4S4 motifs, with PF6⁻ anions residing in the crystal lattice as counterions. The incorporation of soft sulfur donors, in combination with PF6⁻ counteranions, generates electron-rich Ag(I) sites that promote strong interactions with iodine molecules. Iodine uptake experiments conducted in cyclohexane solution showed an outstanding adsorption capacity of 3110 mg g⁻¹. Analysis of the equilibrium data indicated that the adsorption behavior is well represented by the Freundlich model, suggesting the presence of energetically non-uniform adsorption sites and multilayer uptake. Time-dependent adsorption studies further revealed that the iodine capture process proceeds according to pseudo-second-order kinetics, consistent with a chemisorption-controlled mechanism. Overall, these findings demonstrate that the cooperative effect of the cationic Ag–S polymeric backbone and the associated counteranions plays a decisive role in achieving efficient iodine capture in non-porous silver-based coordination polymers.