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

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...

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Published in:Angewandte Chemie International Edition 2005-11, Vol.44 (44), p.7298-7301
Main Authors: Tang, Hong-Zhi, Novak, Bruce M., He, Jiangtao, Polavarapu, Prasad L.
Format: Article
Language:English
Subjects:
circular dichroism
helical structures
molecular devices
polyguanidine
switching
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description 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.
doi_str_mv 10.1002/anie.200501977
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subjects circular dichroism
helical structures
molecular devices
polyguanidine
switching
title A Thermal and Solvocontrollable Cylindrical Nanoshutter Based on a Single Screw-Sense Helical Polyguanidine
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