The regular pore systems of nanometric openings exhibited by zeolite frameworks make these materials ideal host matrices for achieving supramolecular organization of photoactive species, leading to versatile building blocks for the realization of hierarchically organized multifunctional composite materials1. Organic/inorganic hybrid materials (like zeolites+colorants) are currently used in strategic areas, from sustainable energy technologies to biomedical sciences. In these systems, photoactive molecules are organized in one-dimensional nanostructures inside the zeolite channels2. The zeolites with AFI topology have been extensively studied with the aim to produce new hybrid materials with optical properties. These studies3 demonstrated i) the incorporation of dyes into AlPO4-5 monodimensional channel system; ii) new spectroscopic properties and iii) the laser action of the system with properties tunable over a wide range. However, for these systems, detailed information on the crystal structure and on the host/guest interactions are completely lacking. Here we present the results of a work aimed to the synthesis and the structural characterization of azobenzene/AlPO4-5 organic/inorganic composite, performed following these experimental steps: 1) synthesis of AlPO4-5 zeolite; 2) study of the thermal stability of the host zeolite by high temperature in situ synchrotron X-ray powder diffraction (ID22, ESRF, Grenoble); 3) preparation of the azobenzene/AlPO4-5 composite and its thermogravimetric analysis; 4) structural characterization of the dye guest molecule organization inside the zeolite pores (Fig. 1) by synchrotron X-ray powder diffraction (Xpress, Elettra, Trieste).

ORGANIZATION OF PHOTOACTIVE MOLECULES IN AZOBENZENE/AlPO4-5 COMPOSITE

Simona Quartieri;
2017-01-01

Abstract

The regular pore systems of nanometric openings exhibited by zeolite frameworks make these materials ideal host matrices for achieving supramolecular organization of photoactive species, leading to versatile building blocks for the realization of hierarchically organized multifunctional composite materials1. Organic/inorganic hybrid materials (like zeolites+colorants) are currently used in strategic areas, from sustainable energy technologies to biomedical sciences. In these systems, photoactive molecules are organized in one-dimensional nanostructures inside the zeolite channels2. The zeolites with AFI topology have been extensively studied with the aim to produce new hybrid materials with optical properties. These studies3 demonstrated i) the incorporation of dyes into AlPO4-5 monodimensional channel system; ii) new spectroscopic properties and iii) the laser action of the system with properties tunable over a wide range. However, for these systems, detailed information on the crystal structure and on the host/guest interactions are completely lacking. Here we present the results of a work aimed to the synthesis and the structural characterization of azobenzene/AlPO4-5 organic/inorganic composite, performed following these experimental steps: 1) synthesis of AlPO4-5 zeolite; 2) study of the thermal stability of the host zeolite by high temperature in situ synchrotron X-ray powder diffraction (ID22, ESRF, Grenoble); 3) preparation of the azobenzene/AlPO4-5 composite and its thermogravimetric analysis; 4) structural characterization of the dye guest molecule organization inside the zeolite pores (Fig. 1) by synchrotron X-ray powder diffraction (Xpress, Elettra, Trieste).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3120076
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