A 13C NMR spectroscopic study of the phase transitions of alkane dicarboxylic acids in the solid state |
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| Affiliation: | 1. Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran;2. Membrane Technology Research Center, Sahand University of Technology, Tabriz, Iran;1. Programa de Pós-Graduação em Engenharia Química, UFSCar, São Carlos, Brazil;2. IPT, Núcleo de Bionanomanufatura, São Paulo, Brazil;1. Department of Materials Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;2. Institute of Metal Physics, Ural Division RAS, Ekaterinburg 620219, Russia;1. CEB – Centre of Biological Engineering, University of Minho, Campus de Gualtar, P-4710-057, Braga, Portugal;2. CIQUP, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Portugal;3. Medical Photonics Lab, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Fredrik Bajers vej 7, DK-9220, Aalborg, Denmark;1. Normandie Université, Laboratoire SMS-EA3233, Université de Rouen, F76821 Mont Saint Aignan, France;2. Faculté de Pharmacie, Université Paris Descartes, USPC, 4 avenue de l’observatoire, 75006 Paris, France;3. Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, 08019 Barcelona, Catalonia, Spain;4. LETIAM, EA7357, IUT Orsay, Université Paris Sud, rue Noetzlin, 91405 Orsay, France |
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| Abstract: | 13C NMR spectra of a few odd-member alkane dicarboxylic acids such as glutaric and pimelic acids have been studied across their phase transitions. The spectra provide clear evidence for the structural changes accompanying the transitions. In the case of malonic acid, the study establishes that the two carboxyl units are equivalent in the high-temperature phase unlike in the other odd-member dicarboxylic acids where they are non-equivalent. |
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