Chemical Papers

, Volume 72, Issue 4, pp 773–798 | Cite as

Ligand-driven light-induced spin transition in spin crossover compounds

Review
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Abstract

Spin crossover (SCO) coordination compounds that show bistability between low spin and high spin states are promising light-controllable molecular switches. Selective wavelength irradiation of the coordination centre at low temperatures is known as a light-induced excited spin state trapping (LIESST effect) and it leads to the modulation of physical properties of SCO materials on the macroscopic as well as on the molecular level. Another way to trigger the spin state conversion by light is based on the isomerization of photoactive ligand moieties. The ligand field strength is changed due to light-induced photoisomerization and, therefore, corresponding cistrans or ring-closing/ring-opening isomeric couples might exhibit different spin states at isothermal conditions. Such an approach is called as ligand driven light-induced spin change (LD LISC effect). From the application point of view, it presents a promising alternative to the LIESST effect because it can operate at room temperature. This article is focused on the most interesting iron and cobalt SCO compounds with photoisomerizable ligands and provides the overview of achieving results based on the LD LISC effect.

Keywords

Spin crossover Light Switching Photoisomerization Photomagnetism LIESST effect Fe(II) and Co(II) complexes 

Notes

Acknowledgements

Grant Agencies (Slovakia: APVV-14-0078, APVV-14-0073, VEGA 1/0125/18, STU Grant scheme for Support of Excellent Teams of Young Researchers and COST Action CM1305 (ECOSTBio)) are acknowledged for the financial support.

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© Institute of Chemistry, Slovak Academy of Sciences 2018

Authors and Affiliations

  1. 1.Department of Inorganic Chemistry, Faculty of Chemical and Food TechnologySlovak University of Technology BratislavaBratislavaSlovakia

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