Reversible Photochemical Conversion of Helicity in Self-Assembled Nanofibers from a 1,ω-Thymidylic Acid Appended Bolaamphiphile

✍ Scribed by Rika Iwaura; Toshimi Shimizu

• Book ID: 101535986
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 325 KB
• Volume: 118
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/ange.200601173

✦ Synopsis

Activation of photoreactive compounds, such as azobenzenecontaining derivatives, [1][2][3] stilbene-containing compounds, [4] dithienylcyclopentene, [5] maleic acid amide derivatives, [6] and 2H-chromene-containing compounds, [7] is known to induce changes in the self-assembly behavior of the molecules. For example, UV light can act as a switching trigger not only to drive a change in the self-assembled morphology from spheres to rods [1] but also to induce gel-to-sol phase transitions. [2,4,6,7] Sometimes, linearly polarized light allows a single film of a liquid crystal network containing an azobenzene chromophore to bend in any direction. [8] In all cases, configurational or conformational changes in the molecular structures lead to a substantial change in the self-assembled morphologies based on each molecule. The most widely used photoswitching molecules are azobenzene derivatives