Photomagnetic properties of an iron(II) low-spin complex with an unusually long-lived metastable LIESST state.
A comprehensive study of the photomagnetic behavior of the [Fe(L222N5)(CN)2].H2O complex has been carried out. This complex is characterized by a low-spin (LS) iron(II)-metal center up to 400 K and exhibits at 10 K the well-known Light-Induced Excited Spin State Trapping (LIESST) effect. The critical LIESST temperature (T(LIESST)) has been measured to be 105 K. The kinetics of the transition from the metastable high-spin (HS) state to the low-spin state have been determined and used for reproducing the experimental T(LIESST) curve. This study represents a second example of a fully low-spin iron(II)-metal complex up to 400 K, which can be photoexcited at low temperature with an atypical long-lived metastable HS state. This underlines the preponderant role of the inner coordination sphere for stabilizing the lifetime of the photoinduced HS state.
Costa
José Sánchez
JS
Institut de Chimie de la Matière Condensée de Bordeaux, UPR CNRS No. 9048- Université Bordeaux 1, Groupe des Sciences Moléculaires, 87 Av. Doc. A. Schweitzer, F-33608 Pessac, France.
Balde
Cherif
C
Carbonera
Chiara
C
Denux
Dominique
D
Wattiaux
Alain
A
Desplanches
Cédric
C
Ader
Jean-Pierre
JP
Gütlich
Philipp
P
Létard
Jean-François
JF