Complexation of Thia-Crown Ethers with Nickel(II) and Silver(I) Ions in Ethanol and Dimethyl Sulfoxide

The reactivity of thia-crown ethers M1–M3 modified by 2(5H)-furanone fragments relative to nickel(II) and silver(I) ions has been studied. The stability of the complexes was analyzed by spectrophotometry. The thermodynamic parameters of complexation of thia-crown ethers M1–M3 with silver(I) ions in ethanol (95%) and DMSO were determined by isothermal titration calorimetry. The standard enthalpies of formation of the compounds were calculated by the additive group method based on group systematics with Benson-type classification of fragments, including the influence of the nearest-neighbor atoms.