In chemistry and physics, LIESST (Light-Induced Excited Spin-State Trapping) is a method of changing the electronic spin state of a compound by means of irradiation with light.[1]
Many transition metal complexes with electronic configuration d4-d7 are capable of spin crossover (and d8 when molecular symmetry is lower than Oh).[2] Spin crossover refers to where a transition from the high spin (HS) state to the low spin (LS) state or vice versa occurs. Alternatives to LIESST include using thermal changes and pressure to induce spin crossover. The metal most commonly exhibiting spin crossover is iron, with the first known example, an iron(III) tris(dithiocarbamato) complex, reported by Cambi [3] et al. in 1931.
For iron complexes, LIESST involves excitation of the low spin complex with green light to a triplet state. Two successive steps of intersystem crossing result in the high spin complex. Movement from the high spin complex to the low spin complex requires excitation with red light.[1]
YouTube Encyclopedic
-
1/3Views:259 94190 7663 030
-
Was ist das Periodensystem?! - Aufbau und System
-
Magnetismus Grundlagen - Wie funktioniert ein Kompass?
-
NEU: Nuklidkarte - Erklärung und Beispiel - Abitur Physik
Transcription
References
- ^ a b Phillip Gūtlich, Light Induced Electronic Spin State Trapping (LIESST) Archived 2007-05-17 at the Wayback Machine
- ^ Phillip Gūtlich, Andreas Hauser, and Harmut Spiering, Thermal and Optical Switching of Iron(II) Complexes,Angew. Chem. Int. Ed. Engl. 1994.33, 2024-2054, DOI:10.1002/anie.199420241
- ^ Cambi, L.; Cagnasso, A. Atti. Accad. Naz. Lincei, CI. Sci. Fis., Mat. Nut., Rend. 1931, 13, 809. Cambi, L.: Szego, L. Ber. Drsch. Chem. Ges. B 1931, 64, 259.
 | This chemistry-related article is a stub. You can help Wikipedia by expanding it. |
This page was last edited on 26 September 2022, at 06:51