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Wyszukujesz frazę "Clérac, Rodolphe" wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
Reversible single crystal photochemistry and spin state switching in a metal-cyanide complex
Autorzy:
Rouzières, Mathieu
Oyarzabal, Itziar
Malec, Leszek
de Graaf, Coen
Pinkowicz, Dawid
Rams, Michał
Mathonière, Corine
Lohmiller, Thomas
Clérac, Rodolphe
Fabrice, Wilhelm
Schnegg, Alexander
Rogalev, Andrei
Magott, Michał
Arczyński, Mirosław
Opis:
Manipulating the physical properties of solid matter using only photons is a major challenge in materials science. However, achieving such control over a chemical reaction in the solid state is even more challenging. Here we demonstrate the reversible photochemistry occurring in a single crystal of a simple cyanide complex, $K_{4}[Mo^{III}(CN)_{7}]·2H_{2}O$. Upon exposure to visible light at different wavelengths, a reversible breaking and reformation of dative bonds is triggered, resulting in a photoswitching of the $Mo^{III}$ coordination geometry between 6- and 7-coordinate. This transformation, in turn, induces a spin state change. The observed solid-state photochemical reactivity is robust, quantitative and occurs at a record-high temperature. It paves the way for the development of new photo-switchable high-temperature magnets and nanomagnets.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Molecular alloying drives valence change in a van der Waals antiferromagnet
Autorzy:
Perlepe, Panagiota
Viborg, Anton
Christensen, Niels B.
Brechin, Euan K.
Pryds, Nini
Wong, Siena
Clérac, Rodolphe
Trier, Felix
Jinschek, Joerg R.
Rogalev, Andrei
Stampe, Kirstine A.
Manvell, Anna S.
Kubus, Mariusz
Pedersen, Kasper S.
Aribot, Frédéric
McPherson, James N.
Baran, Volodymyr
Le, Manh Duc
Chanda, Amit
Deylamani, Sara Talebi
Wan, Wenjie
Voigt, Laura
Coletta, Marco
Walker, Helen C.
Wilhelm, Fabrice
McMonagle, Charles J.
Pinkowicz, Dawid
Probert, Michael R.
Dunstan, Maja A.
Yutronkie, Nathan J.
Senyshyn, Anatoliy
Opis:
Bespoke van der Waals (vdW) crystals provide command over the confinement and transport of charge, spin, and heat within and between two-dimensional (2D) layers. We report a novel functionality in vdW crystals by actuating valence changes through molecular alloying. The net materials $Cr(pyrazine)_{2} Br_{2}$ and $Cr(pyrazine)_{2}I_{2}$ are aliovalent, hosting Cr(III) and Cr(II), respectively, due to disparate crystal field potentials. Pressurizing and thereby strengthening of the crystal field compresses the $Cr(pyrazine)_{2}I_{2}$ layers significantly, but no Cr valence change is induced. However, alloyed $Cr(pyrazine)_{2}I_{2−x}Br_{x}$ phases exhibit hysteretic and tunable Cr(II) ⇄ Cr(III) interconversions with concomitant charge injection into the net. The valence switch manifests drastic changes to the magnetization and the electrical conductivity, which varies by up to five orders of magnitude during the valence conversion. This use of coordination chemistry addresses a gap in vdW and 2D materials science, where electronic structure engineering via valence change events has remained elusive.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
    Wyświetlanie 1-4 z 4

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