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An All-Organic Photochemical Magnetic Switch with Bistable Spin States.
J Am Chem Soc
May 2022
Department of Chemistry & IRIS Adlershof, Humboldt University of Berlin, Brook-Taylor-Strasse 2, Berlin D-12489, Germany.
Controlling the electronic spin state in single molecules through an external stimulus is of interest in developing devices for information technology, such as data storage and quantum computing. We report the synthesis and operation mode of two all-organic molecular spin-state switches that can be photochemically switched from a diamagnetic [electron paramagnetic resonance (EPR)-silent] to a paramagnetic (EPR-active) form at cryogenic temperatures due to a reversible electrocyclic reaction of its carbon skeleton. Facile synthetic substitution of a configurationally stable 1,14-dimethyl-[5]helicene with radical stabilizing groups at the 4,11-positions afforded two spin-state switches as 4,11-dioxo or 4,11-bis(dicyanomethylidenyl) derivatives in a closed diamagnetic form.
View Article and Find Full Text PDFAdaptive response of a metal-organic framework through reversible disorder-disorder transitions.
Nat Chem
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Inorganic Chemistry Center I, Department of Chemistry, Technische Universität Dresden, Dresden, Germany.
The ultrahigh porosity and varied functionalities of porous metal-organic frameworks make them excellent candidates for applications that range widely from gas storage and separation to catalysis and sensing. An interesting feature of some frameworks is the ability to open their pores to a specific guest, enabling highly selective separation. A prerequisite for this is bistability of the host structure, which enables the framework to breathe, that is, to switch between two stability minima in response to its environment.
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