A Magneto‐optical Molecular Device: Interplay of Spin Crossover, Luminescence, Photomagnetism, and Photochromism

A bis(pyrazolylpyridyl) ligand, L, containing a central photochromic dithienylethene spacer predictably forms a ferrous [Fe2L3]4+ helicate exhibiting spin crossover (SCO). In solution, the compound [Fe2L3](ClO4)4 (1) preserves the magnetic properties and is fluorescent. The structure of 1 is photo‐s...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2017-12, Vol.56 (49), p.15622-15627
Main Authors: Estrader, Marta, Salinas Uber, Jorge, Barrios, Leoní A., Garcia, Jordi, Lloyd‐Williams, Paul, Roubeau, Olivier, Teat, Simon J., Aromí, Guillem
Format: Article
Language:English
Subjects:
dithienylethene
Fluorescence
Irradiation
Magnetic properties
Magnetism
molecular devices
photo-switching
Photochromism
Spacer
spin crossover
Switches
Ultraviolet radiation
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Summary:A bis(pyrazolylpyridyl) ligand, L, containing a central photochromic dithienylethene spacer predictably forms a ferrous [Fe2L3]4+ helicate exhibiting spin crossover (SCO). In solution, the compound [Fe2L3](ClO4)4 (1) preserves the magnetic properties and is fluorescent. The structure of 1 is photo‐switchable following the reversible ring closure/opening of the central dithienylethene via irradiation with UV/visible light. This photoisomerization switches on and off some emission bands of 1 and provides a means of externally manipulating the magnetic properties of the assembly. Fluoro‐photo‐magnificence: An iron‐containing spin‐crossover molecule has been synthesized that contains a photoswitchable unit. This unit allows its magnetic properties and its fluorescent response using light to be reversibly tuned.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201709136