Polymorphism and luminescence properties of CMONS organic crystals: bulk crystals and nanocrystals confined in gel-glasses |
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| Authors: | Nathalie Sanz, Patrice L. Baldeck, Jean-Fran ois Nicoud, Yvette Le Fur,Alain Ibanez |
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| Affiliation: | a Laboratoire de Cristallographie, CNRS (UMR 5031), associé à l'Université Joseph Fourier et à l'INPG, BP 166, 38042 Grenoble cedex 09, France;b Laboratoire de Spectrométrie Physique, Université Joseph Fourier, CNRS (UMR 5588), BP 87, 38402 Saint Martin d'Hères cedex, France;c Groupe des Matériaux Organiques, Institut de Physique et Chimie des Matériaux de Strasbourg, Université Louis Pasteur et CNRS (UMR 7504), 23 rue du Loess, 67037 Strasbourg, France |
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| Abstract: | In order to compare the polymorphism of 1-cyano-1-(4-nitrophenyl)-2-(4-methoxyphenyl)ethene CMONS crystallized in solutions to that of CMONS nanocrystals grown in the pores of dense sol-gel matrices, we have first studied the CMONS polymorphism in various solvents which were then used in the nanocrystallization processes. The different polymorphs were characterized by differential scanning calorimetry, X-ray diffraction and absorption as well as luminescence spectroscopies. The differences observed between CMONS powders and CMONS nanocrystals illustrate the role played by the silicate matrices on the polymorphism of CMONS. This matrix effect would be used to stabilize a particular polymorph of an organic phase and thus to adjust the optical properties of the nanocomposite hybrid organic–inorganic material. |
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| Keywords: | Organic nanocrystals Hybrid organic– inorganic materials Polymorphism Luminescence |
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