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Competing Symmetry Breaking and Spin Crossover in [FeH 2 L 2–Me ](ClO 4 ) 2
Author(s) -
Watanabe Hiroshi,
Bréfuel Nicolas,
Collet Eric,
Toupet Loïc,
Tanaka Koichiro,
Tuchagues JeanPierre
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201200878
Subject(s) - symmetry breaking , chemistry , spin crossover , symmetry (geometry) , phase (matter) , relaxation (psychology) , crystallography , condensed matter physics , physics , psychology , social psychology , geometry , mathematics , organic chemistry , quantum mechanics
In this contribution, we describe the symmetry breaking that appears in the low‐spin phase of the spin crossover (SC) complex [FeH 2 L 2–Me ](ClO 4 ) 2 , [H 2 L 2–Me = Bis{[(2‐methylimidazol‐4‐yl)methylidene]‐3‐aminopropyl}ethylenediamine], for which low‐spin (LS) to high‐spin (HS) transition may be thermally activated or photoinduced. In the LS phase stable at low temperature, a symmetry breaking occurs at around 120 K, while in the photoinduced HS (PIHS) state the high symmetry is recovered. The relaxation from this PIHS state to the LS low‐symmetry phase occurs through an intermediate LS high‐symmetry phase. The sequence of phases was evidenced by using magnetic susceptibility, X‐ray diffraction, and infrared spectroscopy data.