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First Evidence of a Photoinduced Spin Change in an Fe III Complex Using Visible Light at Room Temperature
Author(s) -
Sour Angélique,
Boillot MarieLaure,
Rivière Eric,
Lesot Philippe
Publication year - 1999
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199912)1999:12<2117::aid-ejic2117>3.0.co;2-p
Subject(s) - chemistry , spin crossover , isomerization , photochemistry , ligand (biochemistry) , spin states , irradiation , visible spectrum , spin transition , photoisomerization , crystallography , inorganic chemistry , catalysis , organic chemistry , biochemistry , receptor , nuclear physics , physics , optoelectronics
An iron(III) complex [Fe(salten)(Mepepy)]BPh 4 containing only one photoisomerizable ligand (Mepepy) has been synthesized, it exhibits a thermally‐induced spin crossover in the solid state and in solution {H 2 salten = 4‐azaheptamethylene‐1,7‐bis(salicylideneiminate); Mepepy = 1‐(pyridin‐4‐yl)‐2‐( N ‐methylpyrrol‐2‐yl)ethene}. The photoisomerizations of both the free and coordinated Mepepy ligand have been observed at room temperature with visible‐light irradiation and monitored by UV/Vis and 1 H NMR spectrometries. trans‐to‐cis isomerization of only one photosensitive ligand in the iron(III) complex is sufficient to detect a partial spin change of the iron(III) ion. This photoinduced spin change is seen for the first time from a high‐spin state to a low‐spin state.