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Type: Artigo de periódico
Title: Structural, sorption and thermodynamic correlations from a layered barium phenylarsonate/n-alkyldiamine system
Author: Lazarin, AM
Morales, GC
Sernaglia, RL
Andreotti, EIS
Airoldi, C
Abstract: The barium phenylarsonate compound, Ba(HO(3)AsC(6)H(5))(2)center dot 2H(2)O, has the ability to intercalate n-alkyl-diamine molecules, H(2)N(CH(2))(n)NH(2) (n=2-5). The amount intercalated (n(f)) from a batchwise procedure and the variation of the original basal distance (d) of 1245 ppm determined through X-ray diffractions, gave linear correlations as a function of the number of carbon atoms in the aliphatic chain (n(c)): n(f)=(2.66 +/- 0.06)-(0.13 +/- 0.02)n(c) and d=(2168 +/- 65)+( 114 +/- 14)n(c). The intercalation process was calorimetrically followed to give exothermic enthalpy and negative Gibbs energy, reflecting spontaneous intercalation reactions at the solid/liquid interface. The displacement of solvent molecules bonded to amine and of those on the matrix during the intercalation increases the disorder to result in positive entropy, giving a favorable set of thermodynamic data for this system. (C) 2011 Elsevier Ltd. All rights reserved.
Subject: Inorganic compounds
Chemical synthesis
Thermogravimetric analysis
X-ray diffraction
Thermodynamic properties
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: Journal Of Physics And Chemistry Of Solids. Pergamon-elsevier Science Ltd, v. 72, n. 6, n. 637, n. 642, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.jpcs.2011.02.003
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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