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Electron paramagnetic resonance studies of the high-spin (HS) <-> low-spin (LS) transition in 2-methyl-5-ethyl-pyridine-5-chloro-salicylalthiosemicarbazonatoferrate(III) performed under hydrostatic pressure up to 500 MPa in a temperature range of 80-310 K have revealed two modifications of the low spin complexes: low-pressure (LS1) and high-pressure (LS2) ones. Under atmospheric pressure LS1 appears on cooling and disappears on heating at 220 K. The hydrostatic pressure shifts the transition to higher temperatures. Below 275 K an increase in pressure to 410 MPa results in abrupt changes in the g-factor and width Delta B of the EPR line indicating a transition to a new phase. The pressure-induced transition LS1 <-> LS2 is almost independent of T up to 275 K, where at a pressure of 420 MPa a triple point is observed. The LS1 <-> LS2 and HS <-> LS2 (at T > 260 K) transitions occur with a large hysteresis of about 95 MPa. The process of the spin transition has been shown to begin with the formation of domains of LS complexes in the matrix of HS ones. The response of the domains to external factors has been studied.

EPR Discovery of a New Pressure-Induced Low-Spin Phase in (2Me-5Et-PyH)[Fe(Th-5Cl-Sa)2]

EPR Discovery of a New Pressure-Induced Low-Spin Phase in (2Me-5Et-PyH)[Fe(Th-5Cl-Sa)₂]