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Under LIESST ( L ight i nduced e Xcited s pin s tate t or LIESST effect rapping) refers to the transition of a complex compound from the low-spin state to a metastable high-spin state under the action of light of a certain wavelength .
This metastable high-spin state can have an almost infinitely long life at a sufficiently low temperature. (Trapping!) As an example of such a process, the excitation of the connection low-spin- [Fe II L 6 ] 2+ [BF 4 - ] 2 → high-spin- [Fe II L 6 ] 2+ [BF 4 - ] 2 (where L = Propyltetrazol ) by means of a green argon - laser (514.5 nm). The reverse reaction to the more stable low-spin state is possible thermally above 40 K or by means of red light.
Individual evidence
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1661.