Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 209, Issue 17, Pages 1759-1768Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.200800271
Keywords
dendronized polymers; molecular machines; polyacetylenes; self-assembly; self-organization
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Funding
- National Science Foundation [DMR-05-48559, DMR-05-20020]
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Self-assembling dendrons sterically disfavor the cisoid conformation through which 6 pi-electrocyclization proceeds in cis-polyarylacetylenes. Through the same mechanism, selected self-organizable dendronized helical cis-polyphenylacetylenes (cis-PPAs) undergo an unprecedented thermally induced cisoid-to-transoid conformational isomerism in bulk. The motion of helix (un)winding can be converted to unidirectional motion in self-organizable den-dronized cis-PPAs. By eliminating 6 pi-electrocyclization, nanomechanical actuators capable of lifting a US dime have been prepared from self-organizable dendronized cis-PPAs.
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