Temperature- and pressure-dependent structural study of {Fe(pmd)2[Ag(CN)2]2}n spin-crossover compound by neutron laue diffraction
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Date
2014-06-04
Journal Title
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Publisher
Wiley
Abstract
The effect of pressure (up to 0.17 GPa) on the spin-crossover compound {Fe(pmd)2[Ag(CN)2]2}n [orthorhombic isomer (II), pmd = pyrimidine] has been investigated by temperature- and pressure-dependent neutron Laue diffraction and magnetometry. The cooperative high-spin [left right arrow] low-spin transition, centred at ca 180 K at ambient pressure, is shifted to higher temperatures as pressure is applied, showing a moderate sensitivity of the compound to pressure, since the spin transition is displaced by ca 140 K GPa-1. The space-group symmetry (orthorhombic Pccn) remains unchanged over the pressure-temperature (P-T) range studied. The main structural consequence of the high-spin to low-spin transition is the contraction of the distorted octahedral [FeN6] chromophores, being more marked in the axial positions (occupied by the pmd units), than in the equatorial positions (occupied by four [Ag(CN)2]- bridging ligands). © 1999-2020 John Wiley & Sons, Inc.
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Keywords
Orthorhombic lattices, Magnetism, Laue method, Neutron diffraction, Crystallography, Spin
Citation
Rodriguez-Velamazan, J. A., Canadillas-Delgado, L., Castro, M., McIntyre, G. J., & Real, J. A. (2014). Temperature- and pressure-dependent structural study of {Fe(pmd)2[Ag(CN)2]2}n spin-crossover compound by neutron laue diffraction. Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 70(3), 436-443. doi: http://dx.doi.org/10.1107/S2052520614003023