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Issue 6, 2009
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Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]

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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 ∼400 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 × 10−8 to 2.1 × 10−11 S m−1 following the first thermal cycle—suggesting possible applications of this material in read-only memory devices (ROM).

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

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Publication details

The article was received on 10 Feb 2009, accepted on 17 Apr 2009 and first published on 29 Apr 2009


Article type: Paper
DOI: 10.1039/B902811K
New J. Chem., 2009,33, 1283-1289

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

    L. Salmon, G. Molnár, S. Cobo, P. Oulié, M. Etienne, T. Mahfoud, P. Demont, A. Eguchi, H. Watanabe, K. Tanaka and A. Bousseksou, New J. Chem., 2009, 33, 1283
    DOI: 10.1039/B902811K

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