Removal of Hydrogen Bonding Interferences in the near Infrared Spectroscopic Determination of Dicarboxylic Acids in Diols
| Autor: | Alan Taylor, Richard W. McCabe |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Chloroform
Acid concentration Hydrogen bond Overtone 010401 analytical chemistry Near-infrared spectroscopy Inorganic chemistry Photochemistry 01 natural sciences 0104 chemical sciences 010309 optics Polyester Absorbance chemistry.chemical_compound Reaction temperature chemistry 0103 physical sciences Spectroscopy |
| Zdroj: | Journal of Near Infrared Spectroscopy. 12:101-104 |
| ISSN: | 1751-6552 0967-0335 |
| DOI: | 10.1255/jnirs.413 |
| Popis: | Although several NIR spectroscopic methods exist for following the synthesis of polyesters, they are all used at the reaction temperature of between 240 and 260°C where reaction still proceeds, they also employ near equimolar concentrations of diacids and diols. A poor correlation, however, is obtained when analysing dilute diacid solutions in diols, this is attributed to hydrogen bonding between the carboxyl and hydroxyl groups. The removal of hydrogen bonding by addition of chloroform to the solution gave excellent correlation of the absorbance of the second overtone carbonyl bands with acid concentration. |
| Databáze: | OpenAIRE |
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