Nanoscale self-hosting of molecular spin-states in the intermediate phase of a spin-crossover material |
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Authors: | Bréfuel Nicolas Collet Eric Watanabe Hiroshi Kojima Masaaki Matsumoto Naohide Toupet Loic Tanaka Koichiro Tuchagues Jean-Pierre |
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Institution: | LCC (Laboratoire de Chimie de Coordination) UPR-CNRS 8241, 205, route de Narbonne, 31077 Toulouse, France. |
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Abstract: | A new spin-crossover (SC) complex Fe(II)H(2)L(2-Me)]AsF(6)](2) has been synthesized, in which H(2)L(2-Me) denotes the chirogenic hexadentate N(6) Schiff-base ligand bis{(2-methylimidazol-4-yl)methylidene]-3-aminopropyl}ethylenediamine. This complex has revealed a rich variety of phases during its two-step thermal crossover, as well as photoinduced spin-state switching. A high-symmetry high-spin (HS, S=2) phase, a low-symmetry low-spin (LS, S=0) phase, an intermediate phase characterized by an unprecedented lozenge pattern of 12 predominantly HS molecular crystallographic sites confining 18 predominantly LS molecular crystallographic sites, and a photoinduced low-symmetry HS phase have been accurately evidenced by temperature-dependent magnetic susceptibility, M?ssbauer spectroscopy, and crystallographic studies. This variety of phases illustrates the multi-stability of this system, which results from coupling between the electronic states and structural instabilities. |
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Keywords: | ferrous materials magnetic properties Moessbauer spectroscopy photomagnetic studies spin crossover |
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