Proton-Induced Spin State Switching in an FeIII Complex.
Angew Chem Int Ed Engl
; 62(18): e202217388, 2023 Apr 24.
Article
em En
| MEDLINE
| ID: mdl-36794891
ABSTRACT
Reversible proton-induced spin state switching of an FeIII complex in solution is observed at room temperature. A reversible magnetic response was detected in the complex, [FeIII (sal2 323)]ClO4 (1), using Evans' method 1 Hâ
NMR spectroscopy which indicated cumulative switching from low-spin to high-spin upon addition of one and two equivalents of acid. Infrared spectroscopy suggests a coordination-induced spin state switching (CISSS) effect, whereby protonation displaces the metal-phenoxo donors. The analogous complex, [FeIII (4-NEt2 -sal2 323)]ClO4 (2), with a diethylamino group on the ligand, was used to combine the magnetic change with a colorimetric response. Comparison of the protonation responses of 1 and 2 reveals that the magnetic switching is caused by perturbation of the immediate coordination sphere of the complex. These complexes constitute a new class of analyte sensor which operate by magneto-modulation, and in the case of 2, also yield a colorimetric response.
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MEDLINE
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En
Ano de publicação:
2023
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Article