Effect of increasing pressure on the structure and temperature-induced changes in magnetic properties of heterospin complexes

The study is concerned with structural rearrangements in the crystals of heterospin complexes Cu(hfac)₂ with nitroxide radicals L^R (hfac is hexafluoroacetylacetonate, L^R is 2-(1-R-1H-pyrazol-4-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl, R is Et or Allyl) induced by increasing pressure from 10⁻⁴ to ∼1 GPa in the pressure-transmitting medium. An increase in the external pressure to only ∼0.03 GPa leads to the disappearance of the temperature-induced magnetic anomaly observed for these heterospin crystals under ambient conditions.