Structure analysis of hydrotalcite intercalated with pyrenetetrasulfonate; experiments and molecular modelling |
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Authors: | Marek Veteška Miroslav Pospíšil Klára Melánová Ludvík Beneš Vítězslav Zima |
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Institution: | (1) Faculty of Mathematics and Physics, Charles University Prague, Ke Karlovu 3, 121 16 Prague 2, Czech Republic;(2) Joint Laboratory of Solid State Chemistry of the Institute of Macromolecular Chemistry (Faculty of Chemical Technology), Academy of Sciences v.v.i. and University of Pardubice, Studentská 84, 532 10 Pardubice, Czech Republic |
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Abstract: | The structure of pyrenetetrasulfonate intercalated with hydrotalcite, having the formula Zn0.68Al0.32(OH)2](C16H6O12S4)0.08 · x H2O], was proposed based on molecular simulations combined with experimental data (X-ray powder diffraction, thermogravimetry).
Calculations were done for samples kept at various relative humidities (0%, 84%, 98%). The appropriate models were selected
from comparison of calculated and measured diffraction patterns. Modelling revealed the arrangement of pyrenetetrasulfonate
anions, and the positions and the amount of water molecules in the interlayer space of the host structure. The results confirmed
a large variability in the arrangement of the guest species. In the sample without water molecules (0% RH), pyrenetetrasulfonate
anions formed a layer at the centre of the interlayer distance. For the sample kept at 84% RH, the anions formed two layers
at the thirds of the interlayer. For the sample kept at 98% RH, the anions became tilted with respect to the layered double
hydroxides (LDH) layers and are less organised. Water molecules were arranged in three distinct planes: one in the middle
and two at the quarters of interlayer distance. The number of water molecules obtained by the modelling basically agrees with
the water content as measured by thermogravimetry.
Figure Pyrenetetrasulfonate was intercalated into hydrotalcite and equilibrated at various relative humidities. Structural analysis
was performed using molecular simulations based on X-ray and thermogravimetric data |
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Keywords: | Hydrotalcite Pyrenetetrasulfonate Intercalation Structure analysis Molecular simulations |
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