Influence of ethyl alcohol in the preparation, morphology and properties of compound DAS-[Eu.sup.3+] and its thermal degradation products

• Published in: Journal of thermal analysis and calorimetry Vol. 114; no. 2; pp. 537 - 547
• Main Authors: Machado, Luiz C, de Carvalho, Maria A, Marins, Antonio A.L, Rodrigues, Rodrigo V, Matos, Jivaldo R, Orlando, Marcos T. D'Azeredo
• Format: Journal Article
• Language: English
• Published: Springer 01-11-2013
• Subjects: Alcohol; Alcohol, Denatured; Chemical properties; Sulfates; Surface active agents; Thermal properties
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-013-2958-x

In this study, two compounds presenting characteristics different from each other were produced from there action between hydrated [Eu.sup.3+] sulfate and [Ba.sup.2+] diphenylamine-4-sulfonate using, respectively, aqueous solution for producing the Eu [([C.sub.12][H.sub.10]NS[O.sub.3]).sub.3] x 7[H.sub.2]O(A) compound and water/ethyl alcohol (7: 1) solution for the Eu [([C.sub.12][H.sub.10]NS[O.sub.3]).sub.3] x 5[H.sub.2]O(B) production. The presence of alcohol molecules in the solution will interfere in the structural arrangement of anionic surfactant DA[S.sup.-] (diphenylamine-4-sulfonate) around the metal ions [Eu.sup.3+] allowing differentiation in the stoichiometric formulas, morphology, and thermal properties of these compounds and their derivatives. Thus, when treating both compounds under oxidizing atmosphere, we found different temperatures of the water loss and conversion of the intermediate pair oxydisulfate [[Eu.sub.2]O[(S[O.sub.4]).sub.2]]/dioxysulfate [([Eu.sub.2][O.sub.2]S[O.sub.4])]. However, the effect of water/surfactant/ alcohol interactions in the metal ion structural arrangement becomes still more evident under reducing atmosphere. After this thermal treatment, significant changes were observed in the morphological characteristics and physical properties of the ([Eu.sub.2][O.sub.2]S oxysulfide) in compound B with respect to compound A.