Synthesis, characterization and thermal behaviour of solid alkali metal mandelates in pyrolytic and oxidant atmosphere

Autor(es)

Silva, R. C. ^[1] ; Caires, F. J. ^[2] ; Gomes, D. J. C. ^[3] ; Colman, T. A. D. ^[4] ; Ionashiro, M. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Fac Ciencias Agr, BR-18603970 Sao Paulo - Brazil

^[2] Univ Estadual Paulista, Dept Quin, BR-17033260 Sao Paulo - Brazil

^[3] Inst Fed Educ Ciencia & Tecnol Piaui, Campus Paulistania Rod Br 407, S-N Ctr, Paulistania, Piaui - Brazil

^[4] Univ Estadual Paulista, Inst Quim, BR-14801970 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS; v. 117, p. 157-161, JAN 2016.
• Citações Web of Science: 1

Resumo

Characterization, thermal stability and thermal decomposition of alkali metal mandelates, M(C6H5CH(OH)CO2)nH(2)O (where M represents Na, K, Rb and Cs and n = 0.3 (Na), 0.6 (K), 2 (Rb) and 1 (Cs)) were investigated employing simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), atomic absorption spectrophotometry (AA), X-ray diffractometry and TG-DSC coupled to infrared spectrophotometer (FTIR). For all the compounds, the mass loss occurs in the beginning of the TG-DSC curves. In the nitrogen atmosphere it was observed that the mass loss of the anhydrous compounds occurs in four or five steps and the mass loss is still observed up to 1000 degrees C, except for the anhydrous compounds under dynamic dry air atmosphere, after the first three steps occurs with the formation of the respective carbonate. The results also provided information concerning the thermal stability and decomposition as well as identification of the gaseous products evolved during the thermal decomposition of these compounds. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/09022-7 - Estudos termoanalíticos, síntese e caracterização dos co-cristais sólidos de alguns antibióticos (fluoroquinolonas) com alguns co-formadores
• Beneficiário: Massao Ionashiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular