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Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]

Salmon, Lionel and Molnar, Gabor and Cobo, Saioa and Oulié, Pascal and Etienne, Michel and Mahfoud, Tarik and Demont, Philippe and Eguchi, Akira and Watanabe, Haruo and Tanaka, Koichiro and Bousseksou, Azzedine Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]. (2009) New Journal of Chemistry, vol. 33 (n° 6). pp. 1283-1289. ISSN 1144-0546

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Official URL: http://dx.doi.org/10.1039/b902811k

Abstract

The temperature dependence of the magnetic susceptibility, optical reflectivity and electrical conductivity of [Fe(HB(pz)3)2] (pz = pyrazolyl) revealed irreversible changes in the material during the low-spin to high-spin transition when the ‘‘as-prepared’’ sample was heated above B400 K for the first time. During this first heating sequence, the initially fine powder sample became coarse, and its crystal structure changed from tetragonal to monoclinic. Single-crystals of the monoclinic form suitable for X-ray analysis could be isolated after the first thermal cycle, and their structure was resolved in the P21/n (Z = 4) space group. Successive cooling and heating cycles did not lead to further modification of the crystal structure, and the temperature dependence of the physical properties remained invariable. Remarkably, the electrical conductivity of the sample measured at 293 K dropped from 6.1 108 to 2.1 1011 S m1 following the first thermal cycle—suggesting possible applications of this material in read-only memory devices (ROM).

Item Type:Article
Additional Information:Thanks to Royal Society of Chemistry editor. The definitive version is available at http://www.rsc.org/. The original PDF of the article can be found at New Journal of Chemistry website : http://www.rsc.org/publishing/journals/NJ/article.asp?doi=b902811k
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Al Akhawayn University - AUI (MOROCCO)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Kyoto University (JAPAN)
Laboratory name:
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Deposited By:Nihad Lahdifi

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