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Crystal Structures and Spin‐Crossover Behavior of Iron(II) Complexes with Chiral and Racemic Ligands
Author(s) -
Sekimoto Yusuke,
Karim Mohammad Razaul,
Saigo Naoto,
Ohtani Ryo,
Nakamura Masaaki,
Hayami Shinya
Publication year - 2017
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.201601232
Subject(s) - chemistry , spin crossover , crystallography , mössbauer spectroscopy , crystal structure , spin states , trigonal crystal system , excited state , stereochemistry , inorganic chemistry , physics , nuclear physics
Chiral iron(II) complexes, [Fe{( R )‐L} 2 (NCS) 2 ] ( 1 ) and [Fe{( S )‐L} 2 (NCS) 2 ] ( 2 ), and racemic complex [Fe( rac )‐L) 2 (NCS) 2 ] ( 3 ) {L = α‐methyl‐ N ‐(2‐pyridinylmethylene)cyclohexanemethanamine} were synthesized. Their structures and magnetic properties were investigated by X‐ray crystallography, magnetic susceptibility measurements, and Mössbauer spectroscopy. Complexes 1 and 2 crystallize in the trigonal system with space group P 3 1 21 and P 3 2 21, respectively. All complexes exhibit spin‐crossover (SCO) behavior and light induced excited spin state trapping (LIESST) effects at 532 nm. Complexes 1 and 2 show similar gradual SCO behavior, and complex 3 shows more gradual SCO, which seems to be a result of the different crystal packing, as complex 3 is the symmetric isomer but 1 and 2 are asymmetric.