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The First Observation of Hidden Hysteresis in an Iron(III) Spin‐Crossover Complex
Author(s) -
Boonprab Theerapoom,
Lee Seok J.,
Telfer Shane G.,
Murray Keith S.,
Phonsri Wasinee,
Chastanet Guillaume,
Collet Eric,
Trzop Elzbieta,
Jameson Guy N. L.,
Harding Phimphaka,
Harding David J.
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201907619
Subject(s) - spin crossover , thermal hysteresis , photoexcitation , spin states , hysteresis , spin transition , phase (matter) , materials science , magnetic hysteresis , excited state , spin (aerodynamics) , phase transition , condensed matter physics , chemical physics , chemistry , atomic physics , magnetization , physics , thermodynamics , magnetic field , organic chemistry , quantum mechanics
Molecular magnetic switches are expected to form the functional components of future nanodevices. Herein we combine detailed (photo‐) crystallography and magnetic studies to reveal the unusual switching properties of an iron(III) complex, between low (LS) and high (HS) spin states. On cooling, it exhibits a partial thermal conversion associated with a reconstructive phase transition from a [HS‐HS] to a [LS‐HS] phase with a hysteresis of 25 K. Photoexcitation at low temperature allows access to a [LS‐LS] phase, never observed at thermal equilibrium. As well as reporting the first iron(III) spin crossover complex to exhibit reverse‐LIESST (light‐induced excited spin state trapping), we also reveal a hidden hysteresis of 30 K between the hidden [LS‐LS] and [HS‐LS] phases. Moreover, we demonstrate that Fe III spin‐crossover (SCO) complexes can be just as effective as Fe II systems, and with the advantage of being air‐stable, they are ideally suited for use in molecular electronics.