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Wyszukujesz frazę "Lohmiller, Thomas" wg kryterium: Autor


Wyświetlanie 1-7 z 7
Tytuł:
THz‐EPR‐based magneto‐structural correlations for cobalt(II) single‐ion magnets with bis‐chelate coordination
Autorzy:
Plass, Winfried
Böhme, Michael
Görls, Helmar
Rams, Michał
Schnegg, Alexander
Lohmiller, Thomas
Pohle, Maximilian H.
Ziegenbalg, Sven
Opis:
New cobalt(II)-based complexes with [N2O2] coordination formed by two bis-chelate ligands were synthesized and characterized by a multi-technique approach. The complexes possess an easy-axis anisotropy (D<0) and magnetic measurements show a field-induced slow relaxation of magnetization. The spin-reversal barriers, i. e., the splitting of the two lowest Kramers doublets (UZFS), have been measured by THz-EPR spectroscopy, which allows to distinguish the two crystallographically independent species present in one of the complexes. Based on these experimental UZFS energies together with those for related complexes reported in literature, it was possible to establish magneto-structural correlations. UZFS linearly depends on the elongation parameter ϵT of the (pseudo-)tetrahedral coordination, which is given by the ratio between the average obtuse and acute angles at the cobalt(II) ion, while UZFS was found to be virtually independent of the twist angle of the chelate planes. With increasing deviation from the orthogonality of the latter, the rhombicity (|E/D|) increases.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
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
    Wyświetlanie 1-7 z 7

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