I performed FTIR analysis of 2 samples: unmodified cellulose nanocrystal (CNC) and carboxylated CNC that was oxidized by using the TEMPO/NaOCl/NaBr oxidation system. Both spectra are shown.
When comparing the unmodified CNC vs. carboxylated CNC, the carboxylated lacks the broad OH band around 3380 cm-1 and has new peaks (that are indicated in red). What could be the reason for the absence of the broad OH band?
I know that it's been reported in the literature that a C=O band close to 1740 cm-1 (which is applicable to my carboxylated sample) is typical for isolated carboxyl groups without hydrogen bonds. In addition, the spectra provide evidence of OH's presence in the sample due to the 1610 cm-1 band of OH scissoring bend.
Dear Saad,
Acids have a broad signal for the OH that goes from 3400-2500 and in your spectra of the carboxylated I could see it. This OH signal means that it is not a monomer is a dimer or is hydrated.
Best
To me, the spectrum in the region of 3500-3000 cm-1 shows derivative like artefacts which sould be because of saturation effects or scattering.
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