What is it about?
A dinuclear CoII complex, [Co2(tphz)(tpy)2]n+ (n=4, 3 or 2; tphz: tetrapyridophenazine; tpy: terpyridine), has been assembled using the redox‐active and strongly complexing tphz bridging ligand. The magnetic properties of this complex can be tuned from spin‐crossover with T1/2≈470 K for the pristine compound (n=4) to single‐molecule magnet with an ST=5/2 spin ground state when once reduced (n=3) to finally a diamagnetic species when twice reduced (n=2).
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Why is it important?
Tuning of magnetic behavior (spin crosover to single molecule magnet to diamagnetic) in A Cobalt complex with redox-active linker. Use of radical as linker promotes remarkably large magnetic exchange couplings and high‐spin species even at room temperature.
Perspectives
This work illustrates experimentally and theoretically how successive redox processes can increase the spin delocalization, and thus promote a dramatic enhancement of the intramolecular magnetic coupling through a bridging ligand, not only in its radical form. This general synthetic approach should help for the intentional design of new high‐spin complexes and SMMs, but it could also be extended to systems with higher nuclearities and dimensionalities, for example to obtain high‐temperature molecule‐based magnets.
Dr. SIDDHARTHA DE
Centre National de la Recherche Scientifique
Read the Original
This page is a summary of: A Redox-Active Bridging Ligand to Promote Spin Delocalization, High-Spin Complexes, and Magnetic Multi-Switchability, Angewandte Chemie, May 2018, Wiley,
DOI: 10.1002/ange.201803842.
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