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Issue 41, 2010
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The photo-induced commensurate modulated structure in site-selective spin crossover complex trans-[Fe(abpt)2(NCS)2]

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Abstract

The photo-induced superstructure of polymorph C of trans-[Fe(abpt)2(NCS)2] (abpt = 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole) is discovered as a commensurate modulated structure by single-crystal X-ray diffraction under irradiation. The crystal structure at 25 K before the photo-irradiation composed of two crystallographically independent iron molecules, one of which exhibits high spin (HS) state and the other at low spin (LS) state. Under green laser light (λ = 532 nm) irradiation, the LS molecule (Fe1) is found to be excited to a metastable HS state and gives rise to a commensurate tripled superstructure along the c axis. In addition, it is confirmed that this modulation persists until the HS → LS relaxation temperature beyond 52 K. Our structural findings suggest that the structural modulation and the site-selective LS → HS excitation are highly correlated.

Graphical abstract: The photo-induced commensurate modulated structure in site-selective spin crossover complex trans-[Fe(abpt)2(NCS)2]

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Supplementary files

Article information


Submitted
14 May 2010
Accepted
16 Jul 2010
First published
10 Sep 2010

Dalton Trans., 2010,39, 9794-9800
Article type
Paper

The photo-induced commensurate modulated structure in site-selective spin crossover complex trans-[Fe(abpt)2(NCS)2]

C. Shih, C. Sheu, K. Kato, K. Sugimoto, J. Kim, Y. Wang and M. Takata, Dalton Trans., 2010, 39, 9794
DOI: 10.1039/C0DT00470G

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