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Wiley, Angewandte Chemie International Edition, 18(55), p. 5612-5612, 2016

DOI: 10.1002/anie.201602509

Wiley, Angewandte Chemie International Edition, 18(55), p. 5521-5525, 2016

DOI: 10.1002/anie.201600694

Wiley, Angewandte Chemie, 18(128), p. 5701-5701, 2016

DOI: 10.1002/ange.201602509

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Strong Exchange Coupling in a Trimetallic Radical-Bridged Cobalt(II)-Hexaazatrinaphthylene Complex

Journal article published in 2016 by Jani O. Moilanen ORCID, Nicholas F. Chilton, Benjamin M. Day, Thomas Pugh, Richard A. Layfield
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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](.-) . The [HAN](.-) 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 Co(II) centres in the unreduced analogue [(HAN){Co(N'')2 }3 ] are weakly coupled (J≈-4.4 cm(-1) ). The finding that [HAN](.-) 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.