Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 890, Issue 1-3, Pages 178-183Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2008.05.033
Keywords
Synchrotron diffraction; Iron (II); Spin transition; Soft X-ray-induced phase conversion
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Funding
- Deutsche Forschungsgemeinschaft
- Fonds der Chemischen Industrie
- University of Mainz
- Australian Research Council
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We have studied the high spin and low spin structural phases of the two-step spin transition compound [Fe(bpp)(2)](NCS)(2)center dot 2H(2)O (bpp: 2,6-bis(pyrazol-3-yl)pyridine) of different sample history with X-ray synchrotron (lambda similar to 0.32 angstrom) powder diffraction at different temperatures as well as with usual X-ray (lambda similar to 1.54 angstrom) powder diffraction at room temperature by performing rapid repeated scans at regular intervals of time. A structural phase transition occurs only during the first step of the spin transition. Time dependent interconversions of the two crystallographic phases have been observed at room temperature for this material. The results indicate that a soft X-ray (Cu-K alpha)-induced structural change occurs in this material at room temperature. Possible mechanisms for this unusual observation are discussed. (c) 2008 Elsevier B.V. All rights reserved.
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