Issue 15, 2005
From the journal:

Physical Chemistry Chemical Physics

High-spin to low-spin relaxation kinetics in the [Fe(TRIM)2]Cl2 complex

Sébastien Bonhommeau,ab   Nicolas Bréfuel,a   Villö K. Pálfi,ac   Gábor Molnár,a   Antoine Zwick,b   Lionel Salmon,d   Jean-Pierre Tuchagues,a   José Sanchez Costa,e   Jean-François Létard,e   Hauke Paulsenf  and  Azzedine Bousseksou*a  

* Corresponding authors

a Laboratoire de Chimie de Coordination, UPR 8241 CNRS, 205 route de Narbonne, Toulouse Cedex, France
E-mail: boussek@lcc-toulouse.fr
Fax: +33-(0)561553003

b Laboratoire de Physique des Solides de Toulouse, UMR 5477 CNRS, 118 route de Narbonne, Toulouse Cedex, France

c Eötvös Loránd University, Institut of Chemistry, Pázmány P. s. 1/A, Budapest, Hungary

d DRECAM-SCM-URA331, CEA SACLAY, Gif sur Yvette, France

e Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, Université Bordeaux I, 87 Av. du Doc. A. Schweitzer, Pessac, France

f Institute of Physics, Medical University of Luebeck, Ratzeburger Allee 160, Luebeck, Germany

Abstract

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.

Graphical abstract: High-spin to low-spin relaxation kinetics in the [Fe(TRIM)2]Cl2 complex

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Article information

DOI
https://doi.org/10.1039/B504614A
Article type
Paper
Submitted
05 Apr 2005
Accepted
13 Jun 2005
First published
05 Jul 2005

Phys. Chem. Chem. Phys., 2005,7, 2909-2914

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High-spin to low-spin relaxation kinetics in the [Fe(TRIM)2]Cl2 complex

S. Bonhommeau, N. Bréfuel, V. K. Pálfi, G. Molnár, A. Zwick, L. Salmon, J. Tuchagues, J. Sanchez Costa, J. Létard, H. Paulsen and A. Bousseksou, Phys. Chem. Chem. Phys., 2005, 7, 2909 DOI: 10.1039/B504614A

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