Journal
CHEMICAL PHYSICS LETTERS
Volume 423, Issue 1-3, Pages 152-156Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2006.03.053
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The temperature dependence of the magnetic susceptibility and Mossbauer spectra of the compounds FeL2[Ni(CN)(4)] (L = 2, 3 or 4-methylpyridine) have been investigated. In each case the iron(II) ions are high spin at room temperature, but in the 3-methylpyridine compound about half of the iron ions becomes diamagnetic around 90 K. The application of external pressure allowed to uncover the underlying two-step nature of this spin transition. For further increase of the pressure the plateau between the two steps disappeared. Both observations were successfully interpreted in the framework of an Ising-like model with two iron sites displaying different volume changes. (c) 2006 Elsevier B.V. All rights reserved.
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