New ferrocene substituted calix[4 and 5]arenes have been prepared and
the crystal structure of a lower-rim substituted bis ferrocene calix[4
]arene (7) has been elucidated. The respective ferrocene/ferrocenium r
edox-couples of compounds 6 (a calix[4]arene tetra ferrocene amide) an
d 8 (a calix[5]arene pentaferrocene amide) are shown to be significant
ly cathodically perturbed in the presence of anions by up to 160 mV in
the presence of dihydrogen phosphate. (C) 1998 Elsevier Science Ltd.
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