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Strong Direct Magnetic Coupling in a Dinuclear Co II Tetrazine Radical Single‐Molecule Magnet
Author(s) -
Woods Toby J.,
BallesterosRivas Maria Fernanda,
Ostrovsky Sergei M.,
Palii Andrew V.,
Reu Oleg S.,
Klokishner Sophia I.,
Dunbar Kim R.
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201501726
Subject(s) - crystallography , tetrazine , chemistry , molecule , antiferromagnetism , paramagnetism , single crystal , ion , single molecule magnet , ligand (biochemistry) , anisotropy , magnetic field , condensed matter physics , physics , magnetization , biochemistry , receptor , organic chemistry , quantum mechanics
The ligand‐centered radical complex [(CoTPMA) 2 ‐μ‐bmtz .− ](O 3 SCF 3 ) 3 ⋅ CH 3 CN (bmtz=3,6‐bis(2′‐pyrimidyl)‐1,2,4,5‐tetrazine, TPMA=tris‐(2‐pyridylmethyl)amine) has been synthesized from the neutral bmtz precursor. Single‐crystal X‐ray diffraction studies have confirmed the presence of the ligand‐centered radical. The Co II complex exhibits slow paramagnetic relaxation in an applied DC field with a barrier to spin reversal of 39 K. This behavior is a result of strong antiferromagnetic metal–radical coupling combined with positive axial and strong rhombic anisotropic contributions from the Co II ions.