Slow Dynamics of the Spin-Crossover Process in an Apparent High-Spin Mononuclear FeII Complex.
Angew Chem Int Ed Engl
; 58(52): 18888-18891, 2019 Dec 19.
Article
em En
| MEDLINE
| ID: mdl-31633857
ABSTRACT
A mononuclear FeII complex that shows a high-spin (S=2) paramagnetic behavior at all temperatures (with standard temperature-scan rates, ≈1â
K min-1 ) has, in fact, a low-spin (S=0) ground state below 100â
K. This low-spin state is not easily accessible due to the extremely slow dynamics of the spin-crossover process-a full relaxation from the metastable high-spin state to the low-spin ground state takes more than 5â
h below 80â
K. Bidirectional photo-switching of the FeII state is achieved reproducibly by two selective irradiations (at 530-590 and 830-850â
nm). The slow dynamics of the spin-crossover and the strong structural cooperativity result in a remarkably wide 95-K hysteresis loop induced by both temperature and selected light stimuli.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2019
Tipo de documento:
Article