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Science 30 April 1999:
Vol. 284. no. 5415, pp. 785 - 788
DOI: 10.1126/science.284.5415.785
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Reports
Self-Assembly of Disk-Shaped Molecules to Coiled-Coil Aggregates with Tunable Helicity
H. Engelkamp,
S. Middelbeek,
R. J. M. ,
Nolte
*
A disk-shaped molecule with chiral tails is shown to form long
fibers of molecular diameter and micrometer length by self-assembly in
chloroform. The molecules are derived from crown ethers and contain a
phthalocyanine ring. In the fibers, they have a clockwise, staggered
orientation that leads to an overall right-handed helical structure.
These structures, in turn, self-assemble to form coiled-coil aggregates
with left-handed helicity. Addition of potassium ions to the fibers
leaves their structure intact but blocks the transfer of the chirality
from the tails to the cores, leading to loss of the helicity of the
fibers. These tunable chiral materials have potential in optoelectronic
applications and as components in sensor devices.
Department of Organic Chemistry, NSR Center, University of
Nijmegen, Toernooiveld, 6525 ED Nijmegen, Netherlands.
*
To whom correspondence should be addressed. E-mail:
tijdink{at}sci.kun.nl
Read the Full Text
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