M. Nishida et al., Super uranophiles: Application to highly effective solvent extraction of uranyl ion in the presence of methyltrioctylammonium chloride, CHEM LETT, (12), 1999, pp. 1275-1276
By using hydroxycalix[n]arene-p-sulfonates, H(j)1(n)(n-)(n=6 and 8) known a
s super uranophiles, uranyl ion, UO22+, in aqueous solution was efficiently
extracted by chloroform in the presence of methyltrioctylammonium chloride
, MTA(+)Cl(-). The extracted species were found to be the ionic associates,
[(UO22+)(1(6)(8-))(H+)(-3)](MTA(+))(9) and [(UO22+)(2)(1(8)(12-))(H+)(-3)]
(MTA(+))(11).