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Structural investigation of the photoinduced spin conversion in the dinuclear compound {[Fe(bt)(NCS) 2 ] 2 (bpym)}: toward controlled multi‐stepped molecular switches
Author(s) -
Trzop Elzbieta,
BuronLe Cointe Marylise,
Cailleau Hervé,
Toupet Loïc,
Molnar Gabor,
Bousseksou Azzedine,
Gaspar Ana B.,
Real José Antonio,
Collet Eric
Publication year - 2007
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s002188980605028x
Subject(s) - excited state , metastability , spin crossover , chemistry , spin states , excitation , molecule , spin (aerodynamics) , crystallography , laser , atomic physics , molecular physics , optics , physics , inorganic chemistry , organic chemistry , quantum mechanics , thermodynamics
The photocrystallographic investigation of the light‐induced excited spin‐state trapping effect in the dinuclear spin‐crossover compound {[Fe(bt)(NCS) 2 ] 2 (bpym)} is reported. In this system, each of the two Fe sites may be either in the high‐spin (HS) or in the low‐spin (LS) state, so that the molecule corresponds to a three‐state system (LS–LS, HS–LS and HS–HS). At low temperature, the laser excitation wavelength controls the photoswitching from the stable LS–LS state to one of the metastable excited states (HS–LS or HS–HS), and also between these two excited states. Significant changes in the crystalline structure associated with the photoinduced change of spin state are detailed here. The low‐temperature photoinduced states look similar to the corresponding states observed at thermal equilibrium within the unit‐cell thermal contraction.