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3 results on '"Benoit Fleury"'

1. Tuning the spin-transition properties of pyrene-decorated 2,6-bispyrazolylpyridine based Fe(ii) complexesElectronic supplementary information (ESI) available: NMR, ESI mass and IR spectra of ligands L1and L2, and compounds 1, 2and 3. Emission spectra of 3excited at 270 nm and normalized emission intensity of polycrystalline pyrene butyric acid as a function of the temperature. X-Ray crystallographic parameters of 1. CCDC reference number 790319. For ESI and crystallographic data in CIF or other electronic format, see DOI: 10.1039/c1dt10420a

Author

Rodrigo González-Prieto, Benoit Fleury, Frank Schramm, Giorgio Zoppellaro, Rajadurai Chandrasekar, Olaf Fuhr, Sergei Lebedkin, Manfred Kappes, and Mario Ruben

Subjects
*PYRENE, *IRON compounds, *LIGANDS (Chemistry), *METAL complexes, *SUBSTITUTION reactions, *FLUORESCENCE
Abstract

Two 2,6-bispyrazolylpyridine ligands (bpp) were functionalized with pyrene moieties through linkers of different lengths. In the ligand 2,6-di(1H-pyrazol-1-yl)-4-(pyren-1-yl)pyridine (L1) the pyrene group is directly connected to the bpp moiety viaa C–C single bond, while in the ligand 4-(2,6-di(1H-pyrazol-1-yl)pyridin-4-yl)benzyl-4-(pyren-1-yl)butanoate (L2) it is separated by a benzyl ester group involving a flexible butanoic chain. Subsequent complexation of Fe(ii) salts revealed dramatic the influence of the nature of the pyrene substitution on the spin-transition behaviour of the resulting complexes. Thus, compound [Fe(L1)2](ClO4)2(1) is blocked in its high spin state due to constraints caused by a strong intermolecular π–π stacking in its structure. On the other hand, the flexible chain of ligand L2in compounds [Fe(L2)2](ClO4)2(2) and [Fe(L2)2](BF4)2·CH3CN·H2O (3) prevents structural constraints allowing for reversible spin transitions. Temperature-dependent studies of the photophysical properties of compound 3do not reveal any obvious correlation between the fluorescence of the pyrene group and the spin state of the spin transition core. [ABSTRACT FROM AUTHOR]

Published
2011

2. Orientation of Mn12 molecular nanomagnets in self-assembled monolayers.

Author

Benoit Fleury, Vincent Huc, Laure Catala, Pascale Jegou, Laurent Baraton, Christophe David, Serge Palacin, and Talal Mallah

Subjects
*METAL complexes, *MANGANESE compounds, *MOLECULAR self-assembly, *MONOMOLECULAR films, *CARBOXYLIC acids, *SEMICONDUCTORS, *SILICON, *NANOSTRUCTURED materials
Abstract

The oriented grafting of the Mn12-carboxylate molecular nanomagnets has been achieved on semi-conducting flat Si(100) functionalized surfaces due to the bonding selectivity between axial and equatorial carboxylate groups present in the coordination sphere of the Mn12complexes. [ABSTRACT FROM AUTHOR]

Published
2009
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3. Growth and density control of nanometric nickel–iron cyanide-bridged objects on functionalized Si(100) surfaceElectronic supplementary information (ESI) available: AFM imaging, ATR-IR and XPS spectra, synthetic procedures. See DOI: 10.1039/c003039b

Author

Simon Tricard, Benoit Fleury, Florence Volatron, Claire Costa-Coquelard, Sandra Mazerat, Vincent Huc, Christophe David, François Brisset, Frédéric Miserque, Pascale Jegou, Serge Palacin, and Talal Mallah

Subjects
*NANOSTRUCTURED materials, *TRANSITION metal compounds, *CYANIDES, *SILICON, *DENSITY, *NUCLEATION, *SURFACE chemistry
Abstract

Isolated nanometric objects of the nickel–iron cyanide-bridged coordination network are obtained by a sequential growth on “molecular seeds” anchored on Si(100) surfaces. Control of the density and the size of the nano-objects is achieved by imposing a growth process without side nucleation. [ABSTRACT FROM AUTHOR]

Published
2010
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