Light induced modulated structure of the spin crossover compound {Fe(abpt)2[N(CN)2]2}

{Fe(abpt)2[N(CN)2]2} is an intriguing spin crossover system which crystallizes in two separate phases. Phase A has already been investigated; its crystal structure consists of a single molecule sitting on a center of symmetry. Phase B is the subject of the present structural analysis and presents tw...

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Bibliographic Details
Published in:Journal of physics. Conference series 2005-01, Vol.21 (1), p.221-226
Main Authors: Pillet, S, Lecomte, C, Sheu, C F, Lin, Y C, Hsu, I J, Wang, Y
Format: Article
Language:English
Subjects:
Crossovers
Crystal structure
Light irradiation
Low temperature
Metastable phases
Modulation
Molecular structure
Order disorder
Phase transitions
Physics
Room temperature
Structural analysis
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Summary:{Fe(abpt)2[N(CN)2]2} is an intriguing spin crossover system which crystallizes in two separate phases. Phase A has already been investigated; its crystal structure consists of a single molecule sitting on a center of symmetry. Phase B is the subject of the present structural analysis and presents two independent molecules in the asymmetric unit. We have observed a unique order-disorder phase transition at very low temperature induced either by laser light irradiation or through rapid thermal quenching from room temperature. The corresponding metastable phase exhibits an incommensurate modulation of the crystal structure, disappearing at the HS to LS relaxation temperature (52 K). This modulation is most probably related to a particular ordering of the dicyanamide ligands.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/21/1/037