Controlled Release Kinetics in Hydroxy Double Salts: Effect of Host Anion Structure
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Date
2014-01-16
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Hindawi Publishing Corporation
Abstract
Nanodimensional layered metal hydroxides such as layered double hydroxides (LDHs) and hydroxy double salts (HDSs) can
undergo anion exchange reactions releasing intercalated anions. Because of this, these metal hydroxides have found applications
in controlled release delivery of bioactive species such as drugs and pesticides. In this work, isomers of hydroxycinnamate were
used as model compounds to systematically explore the effects of anion structure on the rate and extent of anion release in HDSs.
Following intercalation and subsequent release of the isomers, it has been demonstrated that the nature and position of substituent
groups on intercalated anions have profound effects on the rate and extent of release.The extent of release was correlated with the
magnitude of dipole moments while the rate of reaction showed strong dependence on the extent of hydrogen bonding within the
layers.The orthoisomer showed a more sustained and complete release as compared to the other isomers.
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This is an open access article distributed under the Creative Commons
Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is
properly cited.
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Citation
Majoni, S. and Hossenlopp, J.M. (2014) ‘Controlled release Kinetics in Hydroxy double salts: Effect of host anion structure’, Advances in Physical Chemistry, 2014, pp. 1–12. doi: 10.1155/2014/710487.