Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran

I. Kashima; M. Okubo; Y. Ono; M. Itoi; N. Kida; M. Hikita; M. Enomoto; N. Kojima

doi:10.1016/j.synthmet.2005.07.286

Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran

I. Kashima, M. Okubo, Y. Ono, M. Itoi, N. Kida, M. Hikita, M. Enomoto, N. Kojima^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

Iron mixed-valence complex, (n-C₃H₇) ₄N[Fe^IIFe^III(dto)₃](dto = C ₂O₂S₂), shows a spin-entropy driven phase transition called charge transfer phase transition around 120 K and a ferromagnetic transition at 6.5 K. These phase transitions remarkably depend on the hexagonal ring size in two-dimensional honeycomb network structure of [Fe^IIFe^III (dto)₃]_∞. In order to control the magnetic properties and the electronic state in the dto-bridged iron mixed-valence system by means of photo-irradiation, we have synthesized a photo-sensitive organic-inorganic hybrid system, (SP)[Fe^IIFe ^III(dto)₃](SP = spiropyran), and investigated the photo-induced effect on the magnetic properties by the measurements of magnetic susceptibility, ESR, IR, UV-vis and ⁵⁷Fe Mössbauer spectra. Upon UV irradiation at 337 nm, a broad absorption band between 500 nm and 600 nm appears and continuously increases with the photo-irradiation time, which implies that the UV irradiation changes the structure of spiropyran from closed form to open one in solid state. The photochromism in spiropyran changes the ferromagnetic transition temperature and the coercive force.

Original language	English
Pages (from-to)	473-476
Number of pages	4
Journal	Synthetic Metals
Volume	153
Issue number	1-3
DOIs	https://doi.org/10.1016/j.synthmet.2005.07.286
Publication status	Published - 2005 Sept 21
Externally published	Yes

Keywords

Magnetic measurements
Magnetic phase transition

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.synthmet.2005.07.286

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@article{35dc041dbdc54b1cb43f54efc7769a3c,

title = "Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran",

abstract = "Iron mixed-valence complex, (n-C3H7) 4N[FeIIFeIII(dto)3](dto = C 2O2S2), shows a spin-entropy driven phase transition called charge transfer phase transition around 120 K and a ferromagnetic transition at 6.5 K. These phase transitions remarkably depend on the hexagonal ring size in two-dimensional honeycomb network structure of [FeIIFeIII (dto)3]∞. In order to control the magnetic properties and the electronic state in the dto-bridged iron mixed-valence system by means of photo-irradiation, we have synthesized a photo-sensitive organic-inorganic hybrid system, (SP)[FeIIFe III(dto)3](SP = spiropyran), and investigated the photo-induced effect on the magnetic properties by the measurements of magnetic susceptibility, ESR, IR, UV-vis and 57Fe M{\"o}ssbauer spectra. Upon UV irradiation at 337 nm, a broad absorption band between 500 nm and 600 nm appears and continuously increases with the photo-irradiation time, which implies that the UV irradiation changes the structure of spiropyran from closed form to open one in solid state. The photochromism in spiropyran changes the ferromagnetic transition temperature and the coercive force.",

keywords = "Magnetic measurements, Magnetic phase transition",

author = "I. Kashima and M. Okubo and Y. Ono and M. Itoi and N. Kida and M. Hikita and M. Enomoto and N. Kojima",

year = "2005",

month = sep,

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doi = "10.1016/j.synthmet.2005.07.286",

language = "English",

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TY - JOUR

T1 - Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran

AU - Kashima, I.

AU - Okubo, M.

AU - Ono, Y.

AU - Itoi, M.

AU - Kida, N.

AU - Hikita, M.

AU - Enomoto, M.

AU - Kojima, N.

PY - 2005/9/21

Y1 - 2005/9/21

N2 - Iron mixed-valence complex, (n-C3H7) 4N[FeIIFeIII(dto)3](dto = C 2O2S2), shows a spin-entropy driven phase transition called charge transfer phase transition around 120 K and a ferromagnetic transition at 6.5 K. These phase transitions remarkably depend on the hexagonal ring size in two-dimensional honeycomb network structure of [FeIIFeIII (dto)3]∞. In order to control the magnetic properties and the electronic state in the dto-bridged iron mixed-valence system by means of photo-irradiation, we have synthesized a photo-sensitive organic-inorganic hybrid system, (SP)[FeIIFe III(dto)3](SP = spiropyran), and investigated the photo-induced effect on the magnetic properties by the measurements of magnetic susceptibility, ESR, IR, UV-vis and 57Fe Mössbauer spectra. Upon UV irradiation at 337 nm, a broad absorption band between 500 nm and 600 nm appears and continuously increases with the photo-irradiation time, which implies that the UV irradiation changes the structure of spiropyran from closed form to open one in solid state. The photochromism in spiropyran changes the ferromagnetic transition temperature and the coercive force.

AB - Iron mixed-valence complex, (n-C3H7) 4N[FeIIFeIII(dto)3](dto = C 2O2S2), shows a spin-entropy driven phase transition called charge transfer phase transition around 120 K and a ferromagnetic transition at 6.5 K. These phase transitions remarkably depend on the hexagonal ring size in two-dimensional honeycomb network structure of [FeIIFeIII (dto)3]∞. In order to control the magnetic properties and the electronic state in the dto-bridged iron mixed-valence system by means of photo-irradiation, we have synthesized a photo-sensitive organic-inorganic hybrid system, (SP)[FeIIFe III(dto)3](SP = spiropyran), and investigated the photo-induced effect on the magnetic properties by the measurements of magnetic susceptibility, ESR, IR, UV-vis and 57Fe Mössbauer spectra. Upon UV irradiation at 337 nm, a broad absorption band between 500 nm and 600 nm appears and continuously increases with the photo-irradiation time, which implies that the UV irradiation changes the structure of spiropyran from closed form to open one in solid state. The photochromism in spiropyran changes the ferromagnetic transition temperature and the coercive force.

KW - Magnetic measurements

KW - Magnetic phase transition

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Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran

Abstract

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