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.
Fleutot
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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.
Dupin
J C
JC
Baraille
I
I
Forano
C
C
Renaudin
G
G
Leroux
F
F
Gonbeau
D
D
Martinez
H
H