Abstract
A series of crescent aromatic oligothioamides (4, 6, 8, 15, and 18) bearing different number of sulfur atoms were designed and synthesized via thionation of their corresponding aromatic oligoamides (3, 5, and 7) using Lawesson’s reagent. The X-ray structure of a trimeric analogue (13) revealed the presence of intramolecular three-center hydrogen bonds that are responsible for the rigidification of the molecular backbone. The extraction by these novel receptors toward some representative heavy metal cations (Zn2+, Cd2+, Co2+, Ni2+, Pb2+, and Cu2+) and alkali and alkaline earth metal cations (Li+, Na+, K+, Rb+, Cs+, Ca2+, and Sr2+) demonstrated high efficiency (83.5%–96.4%) and superior selectivity for Cu2+ over other selected metal cations. Particularly, the extractability was correlated to both the number of sulfur atoms and orientation of thiocarbonyl groups as revealed in the order: 6 > 4 > 18 > 15. This is in stark contrast to the oligoamides that only gave much lower extractability (5.9%–16.4%), suggestive of the importance of replacement of carbonyl oxygen atoms with sulfur atoms in the extraction of Cu2+. The complexation behavior of 4, 6, and 8 with Cu2+ was also examined by UV-Vis and NMR techniques.
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He, L., Jiang, Q., Gao, R. et al. Crescent aromatic oligothioamides as highly selective receptors for copper(II) ion. Sci. China Chem. 57, 1246–1256 (2014). https://doi.org/10.1007/s11426-014-5110-2
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DOI: https://doi.org/10.1007/s11426-014-5110-2