A new route for local probing of inner interactions within a layered double hydroxide/benzene derivative hybrid material.
This paper presents the preparation and characterization of hybrid hydrotalcite-type layered double hydroxides (Zn1-xAlx(OH)2HBSx.nH2O, with x=0.33) where HBS is the 4-phenol sulfonate, with a detailed analysis of the grafting process of this organic entity onto the host lattice. As a set of the usual techniques (XRD, TG-DT/MS, FTIR and 27Al MAS NMR) was used to characterize the hybrid materials, this work focuses on a joint study by X-ray photoelectron spectroscopy and some quantum-calculation modeling in order to highlight the nature of the interactions between the organic and the mineral sub-systems. For the as-prepared hybrid material, the main results lead to a quasi-vertical orientation of the organic molecules within the mineral sheets via H-bond stabilization. By heating the hybrid material up to 200 degrees C, the structure shrinks with the condensation of the organics; the different theoretical modeling done gives an energy-stable situation when a direct attachment of the HBS sulfonate group sets up with the mineral layers, in agreement with the recorded XPS experimental data.
Université de Pau et des Pays de l'Adour, IPREM CNRS UMR 5254, Helioparc Pau Pyrénées, 2 avenue du président Angot, 64053, Pau cedex 9, France.
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S
Fleutot
J C
JC
Dupin
I
I
Baraille
C
C
Forano
G
G
Renaudin
F
F
Leroux
D
D
Gonbeau
H
H
Martinez