Abstract
Magnetization isotherms up to 5.5 T and temperature dependence of magnetic susceptibility down to 1.8 K of the organic neutral radicals, 3- and 4-quinolyl nitronyl nitroxide and 2,6-pyridinediyl bis(nitronyl nitroxide), are described. 3-quinolyl nitronyl nitroxide exhibit ferromagnetic intermolecular interaction with the Weiss constant Θ = 0.27 K, whereas 4-quinolyl nitronyl nitroxide shows antiferromagnetic intermolecular interaction with the exchange coupling constant J/k = −7.8 K. This significant difference between the magnetic properties of two compounds are discussed in terms of their crystal structures. The temperature dependence of product of paramagnetic susceptibility and temperature, χ pT, of a biradical 2,6-pyridinediyl bis(nitronyl nitroxide) shows a plateau at low temperatures in addition to the usual plateau observed in the high-temperature region. This peculiar behavior is interpreted in terms of the multi-spin system associated with a combined effect of ferro- and antiferro-magnetic couplings.
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