High-spin to low-spin relaxation kinetics in the [Fe(TRIM)2]Cl2 complex.
A quasi-quantitative photo-induced low-spin (LS)-->high-spin (HS) conversion of FeII ions has been observed in the [Fe(TRIM)2]Cl2 complex by irradiating the sample with blue light (488 nm) at 10 K. The time dependence of the HS-->LS relaxation has been studied between 10 K and 44 K by means of magnetic susceptibility measurements. These relaxation curves could be satisfactorily fitted by mono-exponential decays including tunnelling effect except for temperatures below 30 K. The introduction of a distribution of vibrational frequencies into this model improved significantly the fits in the low-temperature range and gave a good agreement with the experimental data in the whole temperature range suggesting a multi-rate relaxation process in this complex.
Bonhommeau
Sébastien
S
Laboratoire de Chimie de Coordination, UPR 8241 CNRS, 205 route de Narbonne, F-31077, Toulouse Cedex, France.
Bréfuel
Nicolas
N
Pálfi
Villö K
VK
Molnár
Gábor
G
Zwick
Antoine
A
Salmon
Lionel
L
Tuchagues
Jean-Pierre
JP
Sanchez Costa
José
J
Létard
Jean-François
JF
Paulsen
Hauke
H
Bousseksou
Azzedine
A
D000465:Algorithms; D002712:Chlorides; D005290:Ferric Compounds / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D007700:Kinetics; D013059:Spectrum Analysis, Raman / Q000379:methods; D013113:Spin Labels; D013696:Temperature; D014732:Vibration
D002712:Chlorides; D005290:Ferric Compounds; D007093:Imidazoles; D013113:Spin Labels; C024555:ferric chloride