R. Fiammengo et al., Highly stable cage-like complexes by self-assembly of tetracationic Zn(II)porphyrinates and tetrasulfonatocalix[4]arenes in polar solvents, PHYS CHEM P, 2(23), 2000, pp. 2313-2314
Tetracationic Zn(II) porphyrinates and tetraanionic calix[4]arenes can be a
ssembled in polar solvents to obtain cage-like complexes in an entropy driv
en process. These structures are remarkably stable even in the presence of
water or competing salts.