Structural, sorption and thermodynamic correlations from a layered barium phenylarsonate/n-alkyldiamine system
2011
Abstract The barium phenylarsonate compound, Ba(HO 3 AsC 6 H 5 ) 2 ·2H 2 O, has the ability to intercalate n-alkyldiamine 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.
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