Abstract
Tweezer-type molecules with an ester linkage between catechol
or resorcinol and linear amino acid-based urea or amide derivatives
are prepared. X-ray structures of representative compounds show,
that the molecules are able to form intra- as well as intermolecular
hydrogen bonds. In solution this hydrogen bonding donor/acceptor
ability of the tweezers can be seen, on the one hand by interaction
with anionic guest species (nitrate), and on the other hand by formation
of gels in the case of the urea derivatives.
Key words
amino acids - esters - hydrogen bonds - molecular
recognition - supramolecular chemistry
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