Chapter 6
Molecular Magnetism of Metal
Complexes and Light-Induced Phase
Transitions
Norimichi Kojima and Atsushi Okazawa
Abstract One of the most attractive research in the field of molecular solids is
multifunctional molecular magnets coupled with spin, charge and photon, and singlemolecular magnet/single-chain magnet toward spintronics. In this chapter, we focus
on the molecular magnetism and its related light-induced phase transitions from the
viewpoint of Mössbauer spectroscopy. In the Sect. 6.1, the outline of this chapter is
described. In the Sect. 6.2, static and dynamic spin crossover phenomena between the
high-spin and low-spin states, and the spin frustration system induced by dynamic
spin crossover phenomena for [Mn
II Fe
III (C 2 O 3 S) 3 ] complex are described. In the
Sect. 6.3, metal complexes showing charge transfer phase transitions such as Prussian blue analogous complexes and [Fe
II Fe
III (C 2 O 2 S 2 ) 3 ] complexes and their photoinduced phase transitions are described. In the Sect. 6.4, various kinds of molecular
magnets including single molecular chain magnets are described.
List of Abbreviations and Symbols
CTPT
Charge transfer phase transition
CTIST Charge transfer induced spin transition
IVCT
Inter-valence charge transfer
HS
High spin
LS
Low spin
HTP
High temperature phase
LTP
Low temperature phase
IS
Isomer shift
QS
Quadrupole splitting
N. Kojima (B)
Toyota Physical and Chemical Research Institute, Yokomichi 41-1, Nagakute,
Aichi 480-1192, Japan
e-mail: cnori-kojima@g.ecc.u-tokyo.ac.jp
A. Okazawa
Division of Chemistry, Institute of Liberal Education, Nihon University School of Medicine,
Oyaguchi Kamimachi 30-1, Itabashi-ku, Tokyo 173-8610, Japan
© Springer Nature Singapore Pte Ltd. 2021
Y. Yoshida and G. Langouche (eds.), Modern Mössbauer Spectroscopy,
Topics in Applied Physics 137, https://doi.org/10.1007/978-981-15-9422-9_6
267
Molecular Magnetism of Metal
Complexes and Light-Induced Phase
Transitions
Norimichi Kojima and Atsushi Okazawa
Abstract One of the most attractive research in the field of molecular solids is
multifunctional molecular magnets coupled with spin, charge and photon, and singlemolecular magnet/single-chain magnet toward spintronics. In this chapter, we focus
on the molecular magnetism and its related light-induced phase transitions from the
viewpoint of Mössbauer spectroscopy. In the Sect. 6.1, the outline of this chapter is
described. In the Sect. 6.2, static and dynamic spin crossover phenomena between the
high-spin and low-spin states, and the spin frustration system induced by dynamic
spin crossover phenomena for [Mn
II Fe
III (C 2 O 3 S) 3 ] complex are described. In the
Sect. 6.3, metal complexes showing charge transfer phase transitions such as Prussian blue analogous complexes and [Fe
II Fe
III (C 2 O 2 S 2 ) 3 ] complexes and their photoinduced phase transitions are described. In the Sect. 6.4, various kinds of molecular
magnets including single molecular chain magnets are described.
List of Abbreviations and Symbols
CTPT
Charge transfer phase transition
CTIST Charge transfer induced spin transition
IVCT
Inter-valence charge transfer
HS
High spin
LS
Low spin
HTP
High temperature phase
LTP
Low temperature phase
IS
Isomer shift
QS
Quadrupole splitting
N. Kojima (B)
Toyota Physical and Chemical Research Institute, Yokomichi 41-1, Nagakute,
Aichi 480-1192, Japan
e-mail: cnori-kojima@g.ecc.u-tokyo.ac.jp
A. Okazawa
Division of Chemistry, Institute of Liberal Education, Nihon University School of Medicine,
Oyaguchi Kamimachi 30-1, Itabashi-ku, Tokyo 173-8610, Japan
© Springer Nature Singapore Pte Ltd. 2021
Y. Yoshida and G. Langouche (eds.), Modern Mössbauer Spectroscopy,
Topics in Applied Physics 137, https://doi.org/10.1007/978-981-15-9422-9_6
267