Controlling the Polymorphic Outcome of 2,6-Dimethoxybenzoic Acid Crystallization Using Additives
In this study, 2,6-dimethoxybenzoic acid (2,6MeOBA) was used as a model substance to investigate the use of additives to control the polymorphic outcome of crystallization. 2,6MeOBA exists as three polymorphs. Two of the 2,6MeOBA polymorphs, I and III, obtained in most of the crystallization experim...
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| Format: | Article |
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MDPI AG
2022-08-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/8/1161 |
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| author | Aina Semjonova Agris Bērziņš |
| author_facet | Aina Semjonova Agris Bērziņš |
| author_sort | Aina Semjonova |
| collection | DOAJ |
| description | In this study, 2,6-dimethoxybenzoic acid (2,6MeOBA) was used as a model substance to investigate the use of additives to control the polymorphic outcome of crystallization. 2,6MeOBA exists as three polymorphs. Two of the 2,6MeOBA polymorphs, I and III, obtained in most of the crystallization experiments, were characterized by thermal analysis, and their relative thermodynamic stability was determined. Forms I and III are enantiotropically related, where form III is the high-temperature form. Pure form II was very difficult to obtain. Crystallization of 2,6MeOBA was explored under different conditions by performing evaporation and cooling crystallization from different solvents. Surfactants, polymers, and different molecular compounds with diverse possibilities for the formation of intermolecular interactions were tested as additives. The additives facilitating the crystallization of the metastable forms were additionally studied under different crystallization conditions. The effect of additives polyethylene glycol (PEG) and hydroxypropyl cellulose (HPC) on the thermodynamic stability and solvent-mediated phase transition (SMPT) kinetics was evaluated. HPC and PEG showed the potential to favor the formation of form III in crystallization from water. |
| first_indexed | 2024-03-09T09:58:37Z |
| format | Article |
| id | doaj.art-b134cc6df93f48be8b673d592508d470 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T09:58:37Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-b134cc6df93f48be8b673d592508d4702023-12-01T23:35:23ZengMDPI AGCrystals2073-43522022-08-01128116110.3390/cryst12081161Controlling the Polymorphic Outcome of 2,6-Dimethoxybenzoic Acid Crystallization Using AdditivesAina Semjonova0Agris Bērziņš1Faculty of Chemistry, University of Latvia, Jelgavas iela 1, LV-1004 Rīga, LatviaFaculty of Chemistry, University of Latvia, Jelgavas iela 1, LV-1004 Rīga, LatviaIn this study, 2,6-dimethoxybenzoic acid (2,6MeOBA) was used as a model substance to investigate the use of additives to control the polymorphic outcome of crystallization. 2,6MeOBA exists as three polymorphs. Two of the 2,6MeOBA polymorphs, I and III, obtained in most of the crystallization experiments, were characterized by thermal analysis, and their relative thermodynamic stability was determined. Forms I and III are enantiotropically related, where form III is the high-temperature form. Pure form II was very difficult to obtain. Crystallization of 2,6MeOBA was explored under different conditions by performing evaporation and cooling crystallization from different solvents. Surfactants, polymers, and different molecular compounds with diverse possibilities for the formation of intermolecular interactions were tested as additives. The additives facilitating the crystallization of the metastable forms were additionally studied under different crystallization conditions. The effect of additives polyethylene glycol (PEG) and hydroxypropyl cellulose (HPC) on the thermodynamic stability and solvent-mediated phase transition (SMPT) kinetics was evaluated. HPC and PEG showed the potential to favor the formation of form III in crystallization from water.https://www.mdpi.com/2073-4352/12/8/11612,6-dimethoxybenzoic acidpolymorphismcrystallizationcrystallization additivessolvent-mediated phase transition |
| spellingShingle | Aina Semjonova Agris Bērziņš Controlling the Polymorphic Outcome of 2,6-Dimethoxybenzoic Acid Crystallization Using Additives Crystals 2,6-dimethoxybenzoic acid polymorphism crystallization crystallization additives solvent-mediated phase transition |
| title | Controlling the Polymorphic Outcome of 2,6-Dimethoxybenzoic Acid Crystallization Using Additives |
| title_full | Controlling the Polymorphic Outcome of 2,6-Dimethoxybenzoic Acid Crystallization Using Additives |
| title_fullStr | Controlling the Polymorphic Outcome of 2,6-Dimethoxybenzoic Acid Crystallization Using Additives |
| title_full_unstemmed | Controlling the Polymorphic Outcome of 2,6-Dimethoxybenzoic Acid Crystallization Using Additives |
| title_short | Controlling the Polymorphic Outcome of 2,6-Dimethoxybenzoic Acid Crystallization Using Additives |
| title_sort | controlling the polymorphic outcome of 2 6 dimethoxybenzoic acid crystallization using additives |
| topic | 2,6-dimethoxybenzoic acid polymorphism crystallization crystallization additives solvent-mediated phase transition |
| url | https://www.mdpi.com/2073-4352/12/8/1161 |
| work_keys_str_mv | AT ainasemjonova controllingthepolymorphicoutcomeof26dimethoxybenzoicacidcrystallizationusingadditives AT agrisberzins controllingthepolymorphicoutcomeof26dimethoxybenzoicacidcrystallizationusingadditives |