期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 16, 期 47, 页码 14060-14068出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201001264
关键词
ferrous materials; magnetic properties; Moessbauer spectroscopy; photomagnetic studies; spin crossover
资金
- Ministry of Education, Science, Sports, and Culture, Japan [16205010, 18GS0208]
- Institut Universitaire de France
- Region Bretagne, France [4146]
- JSPS
A new spin-crossover (SC) complex [(FeH2L2-Me)-H-II][AsF6](2) has been synthesized, in which H2L2-Me denotes the chirogenic hexadentate N-6 Schiff-base ligand bisa{[(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, Mossbauer 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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