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Temperature dependent Raman scattering study of l-ascorbic acid |
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| Authors: | G.D. Saraiva J.A. Lima Jr.F.F. de Sousa P.T.C. FreireJ. Mendes Filho A.G. Souza Filho |
| Affiliation: | a Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.900-000 Quixadá, CE, Brazil b Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-760 Fortaleza, CE, Brazil c Faculdade de Ciências Naturais, Universidade Federal do Pará, CEP 68.505-080 Marabá, PA, Brazil |
| Abstract: | Temperature dependent Raman study of l-ascorbic acid has been performed from 15 to 418 K. Changes in the wavenumber vs. temperature plots for some internal modes were interpreted as conformational molecular change and the discontinuity in the wavenumber vs. temperature plots along with the appearance of a new vibrational mode in the temperature range 200-270 K suggests that l-ascorbic acid undergoes a structural phase transition. For temperatures higher than 300 K, no relevant modification was observed on the Raman spectra thus indicating a stable structure at high temperatures. Additionally, a correlation between OH stretching wavenumber and the behavior of hydrogen bond is also made. |
| Keywords: | Raman spectroscopy l-Ascorbic acid Temperature Phase transition |
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