A Thermal and Solvocontrollable Cylindrical Nanoshutter Based on a Single Screw‐Sense Helical Polyguanidine

Abstract

Helix-sense-selective polymerization of an achiral carbodiimide using a chiral titanium catalyst yields the regioregular, stereoregular poly[N-(1-anthryl)-N′-n-octadecylguanidine] (poly-1). A reversible thermo- and solvent-driven switching phenomena is exhibited by poly-1 (see scheme) in electronic circular dichroism and optical rotation studies. Furthermore, the helicity of poly-1 is assigned and the mechanism of this switching process is elucidated. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z501977_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.