Strong Exchange Coupling in a Trimetallic Radical-Bridged Cobalt(II)-Hexaazatrinaphthylene Complex
Moilanen, J., Chilton, N. F., Day, B. M., Pugh, T., & Layfield, R. A. (2016). Strong Exchange Coupling in a Trimetallic Radical-Bridged Cobalt(II)-Hexaazatrinaphthylene Complex. Angewandte Chemie, 55(18), 5521-5525. https://doi.org/10.1002/anie.201600694
Julkaistu sarjassa
Angewandte ChemieTekijät
Päivämäärä
2016Tekijänoikeudet
© 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License.
: Reducing hexaazatrinaphthylene (HAN) with potassium
in the presence of 18-c-6 produces [{K(18-c-6)}HAN],
which contains the S = 1/2 radical [HAN]C
¢
. The [HAN]C
¢
radical can be transferred to the cobalt(II) amide [Co{N-
(SiMe3
)2
}2
], forming [K(18-c-6)][(HAN){Co(N’’)2
}3
]; magnetic
measurements on this compound reveal an S = 4 spin
system with strong cobalt–ligand antiferromagnetic exchange
and J ¢290 cm¢1
(¢2 J formalism). In contrast, the CoII
centres in the unreduced analogue [(HAN){Co(N’’)2}3] are
weakly coupled (J ¢4.4 cm¢1
). The finding that [HAN]C
¢
can
be synthesized as a stable salt and transferred to cobalt
introduces potential new routes to magnetic materials based on
strongly coupled, triangular HAN building blocks.
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https://converis.jyu.fi/converis/portal/detail/Publication/25655945
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