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<p>Fe(II) containing spin crossover (SCO) complexes can be reversibly switched between a low-spin (S = 0) and a high-spin (S = 2) state. Switching between the two spin states can be performed e.g. via change of temperature. In some SCO complexes, it is also possible to trigger a light induced excited spin state trapping (LIESST) effect by irradiating the SCO material with light. Here, we report on the vibrational properties of the LIESST state of the SCO complex Fe(PM-BiA)<sub>2</sub>(NCS)<sub>2</sub> investigated via nuclear inelastic scattering (NIS). For our NIS experiments, we used a liquid Helium cryostat at beamline P01, PETRA III, DESY Hamburg, dedicated to NIS experiments down to LHe temperature. Using a modified sample rod which allows illumination of samples within the synchrotron beam down to LHe temperatures we could stabilize the LIESST state of Fe(PM-BiA)<sub>2</sub>(NCS)<sub>2</sub> for nearly 100% of the iron centres at a sample temperature of 25&#xa0;K.</p>

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Novel sample environment for exploration of metastable light induced states at beamline P01, PETRA III, DESY

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月11日

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  • Konstantin Gröpl,
  • Tim Hunsicker,
  • Juliusz A. Wolny,
  • Marco A. M. Tummeley,
  • Maren H. Hoock,
  • Paul Hausbrandt,
  • Lukas Knauer,
  • Xenia Mechler,
  • Tim Hochdörffer,
  • Vivien Christl,
  • Deepak Prajapat,
  • Ilya Sergeev,
  • Volker Schünemann

摘要

Fe(II) containing spin crossover (SCO) complexes can be reversibly switched between a low-spin (S = 0) and a high-spin (S = 2) state. Switching between the two spin states can be performed e.g. via change of temperature. In some SCO complexes, it is also possible to trigger a light induced excited spin state trapping (LIESST) effect by irradiating the SCO material with light. Here, we report on the vibrational properties of the LIESST state of the SCO complex Fe(PM-BiA)2(NCS)2 investigated via nuclear inelastic scattering (NIS). For our NIS experiments, we used a liquid Helium cryostat at beamline P01, PETRA III, DESY Hamburg, dedicated to NIS experiments down to LHe temperature. Using a modified sample rod which allows illumination of samples within the synchrotron beam down to LHe temperatures we could stabilize the LIESST state of Fe(PM-BiA)2(NCS)2 for nearly 100% of the iron centres at a sample temperature of 25 K.