Fluorescent cellulose nanocrystals via supramolecular assembly of terpyridine-modified cellulose nanocrystals and terpyridine-modified perylene
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submitted by mars1999 3 months ago
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Due to their natural origin, biocompatibility, and non-toxicity, cellulose nanocrystals are promising candidates for applications in nanomedicine. Highly fluorescent nanocellulosic material was prepared via surface modification of cellulose nanocrystals with 2,2′:6′,2″-terpyridine side chains followed by supramolecular assembly of terpyridine-modified perylene dye onto the terpyridine-modified cellulose nanocrystals (CTP) via Ru/Rureduction. The prepared terpyridine-modified cellulose-Ru-terpyridine-modified perylene (CTP-Ru-PeryTP) fluorescent nanocrystals were characterized using cross-polarized/magic angle spinC nuclear magnetic resonance (CP/MASC NMR), Fourier transform infrared (FTIR), UV–visible, and fluorescence spectroscopy. In addition, further self-assembly of terpyridine units with azide functional groups onto CTP-Ru-PeryTP was possible via repeating the Ru/Rureduction protocol to prepare supramolecular fluorescent nanocrystals with azide functionality (CTP-Ru-PeryTP-Ru-AZTP). The prepared derivative may have potential application in bio-imaging since the terminal azide groups can be easily reacted with antigens via “Click” chemistry reaction.Surfaces of cellulose nanocrystals were modified with terpyridine ligands. Fluorescent nanocrystals could be obtained via self-assembly of terpyridine-modified perylene dye onto the terpyridine-modified cellulose nanocrystals. Further self-assembly of azide-functionalized terpyridine onto the fluorescent cellulose nanocrystals was possible to obtain nanocellulosic material with expected use in bioimaging.
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