Synthesis and Characterization of Cellulose α-Lipoates: A Novel Material for Adsorption onto Gold View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2006-08-07

AUTHORS

Tim Liebert, Muhammad Ajaz Hussain, Muhammad Nawaz Tahir, Thomas Heinze

ABSTRACT

Novel α-lipoic acid esters of cellulose (cellulose α-lipoates) were synthesized homogeneously in N,N-dimethylacetamide (DMAc)/LiCl using different methods for the in situ activation of the carboxylic acid. Thus, cellulose α-lipoates with degrees of substitution (DS) in the range 0.11 to 1.45 were accessible with N,N’-carbonyldiimidazole and p-toluenesulphonyl chloride as in situ activating agents for the α-lipoic acid. The reactions proceeded totally homogeneous with high yields giving cellulose α-lipoates soluble in DMSO. The α-lipoate moiety containing a S-S function stays intact during the reaction as revealed by FTIR and 1H NMR spectroscopy. The cellulose α-lipoates showed self-assembly onto gold surface yielding layers with a thickness of 2.9–4.9 nm, which can be confirmed by surface plasmon resonance. The perpropionylated cellulose α-lipoates form films with a comparably low thickness of 0.9 nm. More... »

PAGES

857-863

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00289-006-0660-x

DOI

http://dx.doi.org/10.1007/s00289-006-0660-x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1007845079


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