Synthesis, characterization and thermal behaviour of solid 2-methoxycinnamylidenepyruvate of some bivalent metal ions in CO2 and N2 atmospheres

• Published in: Eclética química Vol. 35; no. 4; pp. 55 - 61
• Main Authors: De Carvalho, Cláudio Teodoro, De Siqueira, Adriano Buzutti, Ionashiro, Elias Yuki, Ionashiro, Massao
• Format: Journal Article
• Language: English
• Published: Universidade Estadual Paulista 01-04-2018
• ISSN: 1678-4618; 1678-4618
• DOI: 10.26850/1678-4618eqj.v35.4.2010.p55-61

Solid State M-2-MeO-CP compounds, where M stands for bivalent metals (Mn, Fe, Co, Ni, Cu and Zn) and 2-MeO-CP is 2-methoxycinnamylidenepyruvate, were synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), elemental analysis and complexometry were used to establish the stoichiometry and to study the thermal behaviour of these compounds in CO and N atmospheres. The results were consistent with the general formula: M(L) ·H O. In 2 2 2 2 both atmospheres (CO , N ) the thermal decomposition occurs in consecutive steps which are characteristic of 2 2 each compound. For CO atmosphere the final residues were: Mn O , Fe O , Co O , NiO, Cu O and ZnO, while 2 3 4 3 4 3 4 2 under N atmosphere the thermal decomposition is still observed at 1000 º C.