Jakub Hrubý

Area of research

Materials Chemistry · Electronic, Optical and Magnetic Materials

Research interest

Research topics from publications: A Triangular Frustrated Eu(II)–Organic Framework for Sub-Kelvin Magnetic Refrigeration; Large Hyperfine Coupling Arising from Pseudo-2S Ground States in a Series of Lutetium(II) Metallocene Complexes; Magnetic Blocking in Fluoflavine Radical-Bridged Dilanthanide Complexes. Representative work: Attaining sub-Kelvin temperatures remains technologically challenging and often relies on the scarce resource 3He, unless employing adiabatic demagnetization refrigeration. Herein, the active coolant typically consists of weakly coupled paramagnetic ions, whose magnetic interaction strengths are comparable in energy to the relevant temperature regime of cooling. Such interactions depend strongly on inter-ion distances, fundamentally hindering the realization of dense coolants for sub-Kelvin refrigeration. We present a magnetically concentrated triangular coordination network, Eu0.9Ba0.1I2(pyrazine)3, featuring the large s = 7/2 moment of Eu(II). Electron paramagnetic resonance, magnetization The synthesis of molecules with strong coupling between electronic and nuclear spins represents an important challenge in molecular quantum information science. Here, we report the synthesis and characterization of the divalent lutetium metallocene complexes Lu(CpMe5)(CpiPr5) (CpMe5 = pentamethylcyclopentadienyl; CpiPr5 = pentaisopropylcyclopentadienyl), Lu(CpiPr4Et)2 (CpiPr4Et = ethyltetraisopropylcyclopentadienyl), and Lu(CpiPr4)2 (CpiPr4 = tetraisopropylcyclopentadienyl). The molecular structures of these complexes, as determined through single-crystal X-ray diffraction, feature a common bent sandwich geometry, with average Cp–Lu–Cp angles ranging from 159.9° to 152.6°. Analysis of contin