Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/5983
Título: | Thermal analysis of a polymorphic azo dye derived from 2-amino-5-nitrothiazole |
Autor(es): | Campos, Ana M. F. Oliveira Oliveira, M. J. Rodrigues, Lígia M. Silva, Maria Manuela Smith, Michael John |
Palavras-chave: | Azo dye Polymorphism NMR DSC Hot-stage microscopy |
Data: | Jan-2007 |
Editora: | Elsevier 1 |
Revista: | Thermochimica acta |
Citação: | "Thermochimica acta". ISSN 0040-6031. 453:1 (Jan. 2007). 52-56. |
Resumo(s): | An azo dye, derived from 2-amino-5-nitrothiazole and a substituted N,N-dimethyl aniline, was studied by various techniques. Two sets of proton signals were obtained by NMR in CDCl3 solution, suggesting that two polymorphs coexist, however only one set of signals is observed in DMSO solution. Differential scanning calorimetry and thermogravimetric analysis were used to confirm the existence of two forms. The events registered during thermal treatment of a sample were assigned to a glass transition, recrystallization and fusion of crystalline compounds. Hot-stage microscopy was used to obtain images of the dye samples at various stages of the heating program and these observations support the interpretation of the calorimetric results. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/5983 |
DOI: | 10.1016/j.tca.2006.11.011 |
ISSN: | 0040-6031 |
Versão da editora: | www.elsevier.com http://dx.doi.org/10.1016/j.tca.2006.11.011 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDQuim - Artigos (Papers) IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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TCActa.pdf | Main article with figures | 232,88 kB | Adobe PDF | Ver/Abrir |