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Photoinduced single-molecule magnet properties in a four-coordinate iron(II) spin crossover complex
Corine Mathonière1, Hsiu-Jung Lin, Diana Siretanu
1CNRS, ICMCB, UPR 9048, F-33600 Pessac, France.
Journal of the American Chemical Society
|December 10, 2013
Summary
This study reveals a iron complex exhibiting spin-crossover (SCO) properties. Upon light irradiation, it displays photoinduced spin switching and single-molecule magnet behavior at low temperatures.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Magnetism
Background:
- The iron(II) complex PhB(MesIm)3Fe-N═PPh3 (1) exhibits thermal spin-crossover (SCO) between high-spin and low-spin states.
- SCO materials are of interest for their potential applications in molecular switches and memory devices.
Purpose of the Study:
- To investigate the photoactivity and magnetic properties of the Fe(II) SCO complex.
- To explore the potential of this complex as a photoinduced single-molecule magnet (SMM).
Main Methods:
- Optical reflectivity measurements to determine spin state changes.
- Photomagnetic measurements to assess magnetic properties.
- Variable-temperature magnetization relaxation studies.
Main Results:
- The complex is photoactive below 20 K, showing a photoinduced transition from the low-spin to the high-spin state.
- Under continuous white light irradiation below 5 K, the complex exhibits slow relaxation of magnetization, characteristic of single-molecule magnet (SMM) behavior.
- The observed phenomena are linked to the spin-crossover phenomenon.
Conclusions:
- The Fe(II) complex PhB(MesIm)3Fe-N═PPh3 (1) demonstrates photoinduced spin switching and SMM properties.
- This complex serves as a structural model for designing new photoinduced mononuclear SMMs utilizing SCO.
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