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Issue 30, 2015
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Intermediate-paramagnetic phases with a half and a quarter spin entities in fluorinated biphenyl-3,5-diyl bis(tert-butyl nitroxides)

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Abstract

A new ground-triplet biradical, 2′,5′-difluorobiphenyl-3,5-diyl bis(tert-butyl nitroxide), showed spin-transition-like behaviour at TC↑ = 182 K and TC↓ = 181 K. This compound had a quarter of the nominal amount of paramagnetic spins in the low-temperature phase and a half in the high-temperature phase. Another new 3′-monofluoro derivative maintained a half amount of the spins as a single solid phase, which is isomorphous to the high-temperature phase of the difluoro analogue. During the spin transition, a reversible bond formation–cleavage between nitrogen and oxygen atoms takes place at neighbouring nitroxide groups in an intermolecular fashion. These intermediate states emerge during multi-step spin transition from the unsymmetrical biradicals as designed.

Graphical abstract: Intermediate-paramagnetic phases with a half and a quarter spin entities in fluorinated biphenyl-3,5-diyl bis(tert-butyl nitroxides)

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Publication details

The article was received on 09 Mar 2015, accepted on 04 Apr 2015 and first published on 08 Apr 2015


Article type: Paper
DOI: 10.1039/C5TC00668F
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Citation: J. Mater. Chem. C, 2015,3, 7813-7818
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    Intermediate-paramagnetic phases with a half and a quarter spin entities in fluorinated biphenyl-3,5-diyl bis(tert-butyl nitroxides)

    T. Konno, H. Kudo and T. Ishida, J. Mater. Chem. C, 2015, 3, 7813
    DOI: 10.1039/C5TC00668F

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