AI Article Synopsis
- The study examines how applying pressure (up to 0.17 GPa) affects the spin-crossover compound {Fe(pmd)2[Ag(CN)2]2}n, specifically focusing on its temperature-dependent behavior and structural changes.
- As pressure is increased, the transition temperature for the high-spin to low-spin state shifts upward, indicating that the compound is moderately sensitive to pressure, with a change of about 140 K for each GPa applied.
- Despite changes in spin states, the crystal structure's symmetry remains stable throughout the pressure and temperature ranges, with the most significant structural changes occurring in the octahedral [FeN6] components, particularly affecting the axial positions.
Article 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 ↔ 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).
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| http://dx.doi.org/10.1107/S2052520614003023 | DOI Listing |
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