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A Redox‐Active Bridging Ligand to Promote Spin Delocalization, High‐Spin Complexes, and Magnetic Multi‐Switchability
Author(s) -
Ma Xiaozhou,
Suturina Elizaveta A.,
De Siddhartha,
Négrier Philippe,
Rouzières Mathieu,
Clérac Rodolphe,
Dechambenoit Pierre
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201803842
Subject(s) - diamagnetism , delocalized electron , spin crossover , chemistry , bridging ligand , redox , ligand (biochemistry) , terpyridine , spin states , crystallography , spin (aerodynamics) , molecule , inorganic chemistry , metal , magnetic field , physics , crystal structure , biochemistry , receptor , organic chemistry , quantum mechanics , thermodynamics
A dinuclear Co II complex, [Co 2 (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 T 1/2 ≈470 K for the pristine compound ( n =4) to single‐molecule magnet with an S T =5/2 spin ground state when once reduced ( n =3) to finally a diamagnetic species when twice reduced ( n =2). The two successive and reversible reductions are concomitant with an increase of the spin delocalization within the complex, promoting remarkably large magnetic exchange couplings and high‐spin species even at room temperature.