Synthesis, Vibrational Spectroscopic and Thermal Properties of Oxocarbon Cross-Linked Chitosan

Nelson L. G. D. Souza, Tamyres F. Salles, Humberto M. Brandão, Howell G. M. Edwards, Luiz F. C. de Oliveira
2015 Journal of the Brazilian Chemical Society  
In this work specimens of chitosan which have been cross-linked covalently and ionically with different oxocarbon and pseudo-oxocarbon anions have been synthesised and characterized using infrared and Raman spectroscopic techniques, solid state 13 C nuclear magnetic resonance (NMR) and by thermogravimetry. According to the spectroscopic and thermal results, ionically crosslinked chitosans are obtained with squarate, croconate and rhodizonate ions as crosslinking agents, whereas covalently
more » ... as covalently crosslinked chitosan can be obtained when squaric acid is used as the crosslinking agent; the same products are not observed when the pseudo-oxocarbon anion croconate violet is used, which can be attributed to the low basic strength of the crosslinking species.
doi:10.5935/0103-5053.20150090 fatcat:uekusc6sw5htlkud2i33blvygy