Calix[6]arenes bearing N,N-dalkylaniline units or m-phenylenediamine u
nits were synthesized to capture C-60 in organic solution: the associa
tion constants (7.9-1.1 x 10(2) dm(3) mol(-1)) were the largest values
obtained so far, indicating that calix[6]arene acts as an excellent p
latform to facilitate the cooperative action of the donor groups.