Photoexcitation and relaxation properties of a spin-crossover solid in the case of a stable high-spin state

Enachescu, Cristian ; Varret, François ; Codjovi, Epiphane ; Linarès, Jorge ; Floquet, Sébastien ; Manikandan, Palanichamy ; Manoharan, Periakaruppan T. (2006) Photoexcitation and relaxation properties of a spin-crossover solid in the case of a stable high-spin state Journal of Physical Chemistry B, 110 (12). pp. 5883-5888. ISSN 1520-6106

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp054149e

Related URL: http://dx.doi.org/10.1021/jp054149e

Abstract

The molecular solid [FeIIL2](ClO4)2·CH3CN where L is 2,6-bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine provides a stable high-spin (HS) state at low temperature. Photoexcitation and subsequent relaxation have been studied using light-induced excited state spin trapping [LIESST(H → L)] in the 700−850 nm range, determination of TLIESST, relaxation curves at different temperatures, and temperature dependence of the light-induced spin equilibrium under constant irradiation. The measured photoinduced population of the metastable low-spin (LS) state (<30%) was drastically limited by the concomitant L → H photoprocess. The absence of static light-induced thermal hysteresis and the stretched exponential shape of the relaxation curves respectively revealed the absence of sizable interactions and a large spreading of the activation energies attributed to the ligand flexibility. The whole data set has been simulated using a linear rate equation, with a simplified correction for the bulk extinction of light in the powder sample.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:95769
Deposited On:11 Jan 2013 11:32
Last Modified:11 Jan 2013 11:32

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