Nanoscale self-hosting of molecular spin-states in the intermediate phase of a spin-crossover material. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Chemistry - A European Journal Année : 2010

Nanoscale self-hosting of molecular spin-states in the intermediate phase of a spin-crossover material.

Résumé

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, Mössbauer 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.

Dates et versions

hal-00910889 , version 1 (28-11-2013)

Identifiants

Citer

Nicolas Bréfuel, Eric Collet, Hiroshi Watanabe, Masaaki Kojima, Naohide Matsumoto, et al.. Nanoscale self-hosting of molecular spin-states in the intermediate phase of a spin-crossover material.. Chemistry - A European Journal, 2010, 16 (47), pp.14060-8. ⟨10.1002/chem.201001264⟩. ⟨hal-00910889⟩
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