Complexation and self-assembling of sulfonatomethylated calix[4]resorcinarene with both organic and lanthanide ions in aqueous media

The stoichiometry and binding constant of the paramagnetic lanthanide ion (Gd3+) with sulfonatomethylated calix[4] resorcinarene (H8XNa4) were evaluated from the NMR relaxation data. Both H-1 NMR spectroscopy and NMR relaxation data indicate that interaction of tetramethylammonium (TEMA) and N-methylpyridinium ( MePy) cations with H(8)Xna(4) in the presence of Ln(3+) (Lu3+ or Gd3+) results in the formation of ternary complexes [Ln(G) H8X] with lanthanide ions, coordinated via sulfonate groups and organic cation included into the cavity of H8XNa4. The inclusion of long-chained N-decyl-(DePy) and N-cetylpyridinium (CPy) ions into H8XNa4 cavity leads to self-assembling which can be revealed by NMR relaxation method with Gd3+ probe ions. The excess of alkylpyridinium or TEMA cations leads to disassembling of (Gd)(n)(H8X)(m)(RPy)(m) aggregates.