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A Hydrogen‐Bonded Cyanide‐Bridged [Co 2 Fe 2 ] Square Complex Exhibiting a Three‐Step Spin Transition
Author(s) -
Nihei Masayuki,
Yanai Yuta,
Hsu I.Jui,
Sekine Yoshihiro,
Oshio Hiroki
Publication year - 2017
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.201610268
Subject(s) - spin transition , cyanide , hydrogen bond , crystallography , chemistry , acceptor , crystallization , spin (aerodynamics) , hydrogen , phase transition , phase (matter) , hydrogen cyanide , inorganic chemistry , molecule , condensed matter physics , organic chemistry , thermodynamics , physics
Co‐crystallization of a cyanide‐bridged tetranuclear complex [Co 2 Fe 2 ] with 4‐cyanophenol (CP) gave a hydrogen bonding donor–acceptor system, [Co 2 Fe 2 (bpy*) 4 (CN) 6 (tp*) 2 ](PF 6 ) 2 ⋅2 CP⋅8 BN ( 1 ). 1 exhibited a three‐step phase transition between HT, IM1, IM2, and LT phases upon temperature variation. Variable temperature magnetic measurements and structural analyses revealed that the three‐step spin transition is caused by electron‐transfer‐coupled spin transitions (ETCSTs) accompanied with alteration of the hydrogen bonding interactions.