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R
2
N
O
O
O
N
N
H
H
H
o
o
H
H
H
H
o
o
O
N
N
O
H
H
H
o
o
H
H
H
O
N
N
O
NR
2
O
O
NR
2
Boc
HN
NHBoc
Figure 2.37 Proposed folded conformation of arylamide oligomer upon binding with the
benzene-1,3,5-tricarboxylate anion.
also display dynamic behavior like the twisting and folding that make them potentially
chiral. Following this work, the Sessler group obtained a similar result with an oligopep-
tide containing bipyrroles and 2,6-diamidopyridine units, connected via enamine linkages
(Figure 2.39) [104]. Anion binding studies show selective binding toward tetrahedral
Figure 2.38 Structure of the 1 : 2 complex of hexamer with tetrabutylammonium chloride.
Reprinted with permission from Ref. [102]. Copyright 2006 WILEY-VCH Verlag GmbH & Co.
KGaA, Weinheim.
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