Nanomechanical Function Made Possible by Suppressing Structural Transformations of Polyarylacetylenes

Self‐assembling dendrons sterically disfavor the cisoid conformation through which 6π‐electrocyclization proceeds in cis‐polyarylacetylenes. Through the same mechanism, selected self‐organizable dendronized helical cis‐polyphenylacetylenes (cis‐PPAs) undergo an unprecedented thermally induced cisoid...

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Bibliographic Details
Published in:	Macromolecular chemistry and physics Vol. 209; no. 17; pp. 1759 - 1768
Main Authors:	Rudick, Jonathan G., Percec, Virgil
Format:	Journal Article
Language:	English
Published:	Weinheim WILEY-VCH Verlag 04-09-2008 WILEY‐VCH Verlag
Subjects:	dendronized polymers molecular machines polyacetylenes self-assembly self-organization
Online Access:	Get full text
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Summary:	Self‐assembling dendrons sterically disfavor the cisoid conformation through which 6π‐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 dendronized cis‐PPAs. By eliminating 6π‐electrocyclization, nanomechanical actuators capable of lifting a US dime have been prepared from self‐organizable dendronized cis‐PPAs.
Bibliography:	National Science Foundation - No. DMR-05-48559; No. DMR-05-20020 ArticleID:MACP200800271 istex:6E9E5963E587F4F35A4EBE66D83D407A3986CD86 ark:/67375/WNG-FB11JP68-J ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	1022-1352 1521-3935
DOI:	10.1002/macp.200800271