The photo-induced commensurate modulated structure in site-selective spin crossover complex trans-[Fe(abpt)(2)(NCS)(2)]
Resource
DALTON TRANSACTIONS, 39(41), 9794-9800
Journal
Dalton Transactions
Pages
9794
Date Issued
2010
Date
2010
Author(s)
Shih, Che-Hsiu
Sheu, Chou-Fu
Kato, Kenichi
Sugimoto, Kunihisa
Kim, Jungeun
Wang, Yu
Takata, Masaki
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.
Type
journal article
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