title: Photomagnetic properties of an iron(II) low-spin complex with an unusually long-lived metastable LIESST state.
abstract: 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.
authors.affiliation: 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.
authors.forename: José Sánchez
authors.initials: JS
authors.lastname: Costa
authors.forename: Cherif
authors.initials: C
authors.lastname: Balde
authors.forename: Chiara
authors.initials: C
authors.lastname: Carbonera
authors.forename: Dominique
authors.initials: D
authors.lastname: Denux
authors.forename: Alain
authors.initials: A
authors.lastname: Wattiaux
authors.forename: Cédric
authors.initials: C
authors.lastname: Desplanches
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Ader
authors.forename: Philipp
authors.initials: P
authors.lastname: Gütlich
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Létard