Structure and phase transitions of azomethine biligand complexes of iron(III) based on 3,4,5-tri(tetradecyloxy)benzoyloxy-4-salicylidene-N′-ethyl-N-ethylenediamine

Magnetocaloric Effect in Carbon-Containing Compounds

“…An experimental study of magnetothermal properties of the obtained complex was carried out in magnetic field from 0 to 1.0 T at a temperature of 293 K. Based on the analysis of the results obtained above, it was supposed that all azomethine iron(III) complexes were capable to display MCE. This hypothesis is based on the Mössbauer spectroscopy data which showed that the iron(III) ion was in a high-spin state at the temperature Т ≥ 80 К; polarization thermal microscopy data which indicated that the complexes had phase transitions; and differential scanning calorimetry data confirming the hypothesis [55,56]. To confirm these hypotheses, we carried out an experimental study of the magnetocaloric effect of the new synthesized complex when the magentic field changed from 0 to 1.0 T at a temperature of 293 K. However, contrary to expectations, we found that when the magnetic field was switched on, the complex did not display any magnetocaloric effect.…”

“…It was supposed that this approach would allow combining the liquid crystal state and the properties of the spin-crossover in one temperature range. A new iron(III)-containing complex based on 3,4,5-tri(tetradecyloxy)benzoyloxy-4-salicylidene-N'-ethyl-N-ethylenediamine (C 120 H 206 N 4 O 12 FePF 6 (II.1)) has been synthesized [56]. An experimental study of magnetothermal properties of the obtained complex was carried out in magnetic field from 0 to 1.0 T at a temperature of 293 K. Based on the analysis of the results obtained above, it was supposed that all azomethine iron(III) complexes were capable to display MCE.…”