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Abstract
The iiii stereoisomer of the tetrathiophosphonate-calix[4]resorcinarene host 1 exhibited excellent extraction properties towards soft metal ions, with a better affinity for Ag + (91%), than for Tl + (38%) and Hg 2+ (16%). The extraction of other picrate salts (Cu 2+, Ni 2+, Co 2+, Zn 2+, Cd 2+, Pb 2+) was not detected. The stoichiometry and the structure of the Hg 2+, Tl + and Ag + complexes were studied by NMR in solution and gave respectively 1:1, 1:1 and 1:2 host–guest complexes. The formation of the self-assembled 1 2·(AgPic) 4 complex was independent on the anion and only observed with silver(I) ion.
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