NDLI: Two-Step Thermal Spin Transition and LIESST Relaxation of the Polymeric Spin-Crossover Compounds $Fe(X-py)_{2}[Ag(CN)_{2}]_{2}$ (X=H, 3-methyl, 4-methyl, 3,4-dimethyl, $3-Cl)^{†}$

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Two-Step Thermal Spin Transition and LIESST Relaxation of the Polymeric Spin-Crossover Compounds $Fe(X-py)_{2}[Ag(CN)_{2}]_{2}$ (X=H, 3-methyl, 4-methyl, 3,4-dimethyl, $3-Cl)^{†}$

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Two-Step Thermal Spin Transition and LIESST Relaxation of the Polymeric Spin-Crossover Compounds $Fe(X-py)_{2}[Ag(CN)_{2}]_{2}$ (X=H, 3-methyl, 4-methyl, 3,4-dimethyl, $3-Cl)^{†}$

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Létard, Jean-françois Carbonera, Chiara Palacios, Elías Burriel, Ramón Castro, Miguel Rodríguez-velamazán, J. Alberto Kitazawa, Takafumi
Description	Author Affiliation: Rodríguez-Velamazán JA ( Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain. jarv@unizar.es)
Abstract	In the series of polymeric spin-crossover compounds $Fe(X-py)_{2}[Ag(CN)_{2})]_{2}$ (py=pyridine, X=H, 3-Cl, 3-methyl, 4-methyl, 3,4-dimethyl), magnetic and calorimetric measurements have revealed that the conversion from the high-spin (HS) to the low-spin (LS) state occurs by two-step transitions for three out of five members of the family (X=H, 4-methyl, and X=3,4-dimethyl). The two other compounds (X=3-Cl and 3-methyl) show respectively an incomplete spin transition and no transition at all, the latter remaining in the HS state in the whole temperature range. The spin-crossover behaviour of the compound undergoing two-step transitions is well described by a thermodynamic model that considers both steps. Calculations with this model show low cooperativity in this type of systems. Reflectivity and photomagnetic experiments reveal that all of the compounds except that with X=3-methyl undergo light-induced excited spin state trapping (LIESST) at low temperatures. Isothermal HS-to-LS relaxation curves at different temperatures support the low-cooperativity character by following an exponential decay law, although in the thermally activated regime and for aX=H and X=3,4-dimethyl the behaviour is well described by a double exponential function in accordance with the two-step thermal spin transition. The thermodynamic parameters determined from this isothermal analysis were used for simulation of thermal relaxation curves, which nicely reproduce the experimental data.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	29
Volume Number	16
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2010-08-02
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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