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MDPI, Molecules, 3(25), p. 751, 2020

DOI: 10.3390/molecules25030751

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Organic Salts of p-Coumaric Acid and Trans-Ferulic Acid with Aminopicolines

Journal article published in 2020 by Sosthene Nyomba Kamanda ORCID, Ayesha Jacobs ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

p-Coumaric acid (pCA) and trans-ferulic acid (TFA) were co-crystallised with 2-amino-4-picoline (2A4MP) and 2-amino-6-picoline (2A6MP) producing organic salts of (pCA−)(2A4MP+) (1), (pCA̶ )(2A6MP+) (2) and (TFA̶ )(2A4MP+)·( 3 2 H2O) (3). For salt 3, water was included in the crystal structure fulfilling a bridging role. pCA formed a 1:1 salt with 2A4MP (Z’ = 1) and a 4:4 salt with 2A6MP (Z’ = 4). The thermal stability of the salts was determined using differential scanning calorimetry (DSC). Salt 2 had the highest thermal stability followed by salt 1 and salt 3. The salts were also characterised using Fourier transform infrared (FTIR) spectroscopy. Hirshfeld surface analysis was used to study the different intermolecular interactions in the three salts. Solvent-assisted grinding was also investigated in attempts to reproduce the salts.