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

Sébastien Bonhommeau; Nicolas Bréfuel; Villö K. Pálfi; Gábor Molnár; Antoine Zwick; Lionel Salmon; Jean Pierre Tuchagues; José Sanchez Costa; Jean François Létard; Hauke Paulsen; Azzedine Bousseksou

doi:10.1039/b504614a

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

Sébastien Bonhommeau, Nicolas Bréfuel, Villö K. Pálfi, Gábor Molnár, Antoine Zwick, Lionel Salmon, Jean Pierre Tuchagues, José Sanchez Costa, Jean François Létard, Hauke Paulsen, Azzedine Bousseksou^*

^*Korrespondierende/r Autor/-in für diese Arbeit

Institut für Physik

29 Zitate (Scopus)

Abstract

A quasi-quantitative photo-induced low-spin (LS) → high-spin (HS) conversion of Fe^II 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.

Originalsprache	Englisch
Zeitschrift	Physical Chemistry Chemical Physics
Jahrgang	7
Ausgabenummer	15
Seiten (von - bis)	2909-2914
Seitenumfang	6
ISSN	1463-9076
DOIs	https://doi.org/10.1039/b504614a
Publikationsstatus	Veröffentlicht - 07.08.2005

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

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.",

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doi = "10.1039/b504614a",

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T1 - High-spin to low-spin relaxation kinetics in the [Fe(TRIM) 2]Cl2 complex

AU - Bonhommeau, Sébastien

AU - Bréfuel, Nicolas

AU - Pálfi, Villö K.

AU - Molnár, Gábor

AU - Zwick, Antoine

AU - Salmon, Lionel

AU - Tuchagues, Jean Pierre

AU - Costa, José Sanchez

AU - Létard, Jean François

AU - Paulsen, Hauke

AU - Bousseksou, Azzedine

PY - 2005/8/7

Y1 - 2005/8/7

N2 - 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.

AB - 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.

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U2 - 10.1039/b504614a

DO - 10.1039/b504614a

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