Beschreibung:
<jats:p>The effect of pressure (up to 0.17 GPa) on the spin-crossover compound {Fe(pmd)<jats:sub>2</jats:sub>[Ag(CN)<jats:sub>2</jats:sub>]<jats:sub>2</jats:sub>}<jats:sub><jats:italic>n</jats:italic></jats:sub>[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<jats:italic>ca</jats:italic>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<jats:italic>ca</jats:italic>140 K GPa<jats:sup>−1</jats:sup>. The space-group symmetry (orthorhombic<jats:italic>Pccn</jats:italic>) 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 [FeN<jats:sub>6</jats:sub>] chromophores, being more marked in the axial positions (occupied by the pmd units), than in the equatorial positions (occupied by four [Ag(CN)<jats:sub>2</jats:sub>]<jats:sup>−</jats:sup>bridging ligands).</jats:p>