Two hydroxy-containing amidine derivatives have been synthesized by condensation of amino-alcohols such as monoethanolamine (MEA) and tris(hydroxymethyl)aminomethane (TRIS) with N,N-dimethylformamide dimethyl acetal. Their reaction with carbon dioxide leading to formation of polymeric ionic liquids has been investigated by using FTIR and fluorescent spectroscopy. It has been found that during interaction of MEA-based amidine with CO2 within first 60 min of reaction the intensities’ ratio of absorbance bands at 1646 and 1707 cm-1 dropped from 2.84 to 1.33. The linear relationship between the time of reaction and the mentioned ratio of intensities has been established. In the similar manner the changes in the intensities’ ratio of absorbance bands at 1630 and 1660 cm-1 can be used for monitoring the reaction between TRIS-based amidine and CO2. The possibility to use the changes in the fluorescent intensities of pyrene’s solutions in hydroxy-containing amidines related to increasing viscosity during their interaction with CO2 has been discussed.

FTIR and fluorescent control of interaction between hydroxy-containing amidines and carbon dioxide

ACS Spring 2022

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