Thermal study of l-alanine, l-threonine, and taurine crystals related to hydrogen bonding |
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Authors: | R J C Lima E C Santos-Junior A J D Moreno P F Façanha-Filho P T C Freire M I Yoshida |
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Institution: | 1. Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranh?o, Imperatriz, MA, 65900-410, Brazil 2. Departamento de Física, Universidade Federal do Ceará, Fortaleza, CE, 60455-760, Brazil 3. Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
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Abstract: | In this study l-alanine, l-threonine, and taurine crystals were characterized through dilatometric technique and thermogravimetric and differential thermal analysis. The dilatometric analysis shows that the thermal expansion of the crystals is correlated with the strengths of local hydrogen bonding in the amino acid structures at room temperature. Thermogravimetric analysis and differential thermal analysis of the l-alanine, taurine, and l-threonine crystals have been performed at high temperatures. No clear correlation between the hydrogen bonding strengths and endothermic peak positions was observed. |
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