Photoresponsive Cellulose Nanocrystals

• DOI: 10.5772/50949
• Publication Date: 2012-06-27T07:51:56Z
• Authors: Ilari Filpponen; Hasan Sadeghifar; Dimitris S Argyro...
• Keywords: Carbodiimide; Alkyne; Oxidized cellulose

In this communication a method for the creation of fluorescent cellulose nanoparticles using click chemistry and subsequent photodimerization installed side-chains is demonstrated. first step, primary hydroxyl groups on surface CNCs were converted to carboxylic acids by TEMPO-mediated hypohalite oxidation. The alkyne groups, essential reaction, introduced into TEMPO-oxidized via carbodiimide-mediated formation an amide linkage between monomers carrying amine functionality acid CNCs. Finally, reaction surface-modified nanocrystals azido-bearing coumarin anthracene carried out means chemistry, i.e., Copper(I)-catalyzed Azide-Alkyne Cycloaddition (CuAAC) produce highly photo-responsive nanoparticles. Most significantly, and/or shown undergo UV-induced [2+2] [4+4] cycloaddition reactions, bringing locking together. This effort paves way towards creating, cellulosic photo responsive nano-arrays with potential reversibility since these reactions are known be reversible at varying wavelengths.