Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran
Iron mixed-valence complex, ( n-C 3H 7) 4N[Fe IIFe III(dto) 3] (dto = C 2O 2S 2), 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-dim...
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| Veröffentlicht in: | Synthetic metals 2005-12, Vol.155 (3), p.703-706 |
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| creator | Kashima, I. Okubo, M. Qno, Y. Itoi, M. Kida, N. Hikita, M. Enomoto, M. Kojima, N. |
| description | Iron mixed-valence complex, (
n-C
3H
7)
4N[Fe
IIFe
III(dto)
3] (dto
=
C
2O
2S
2), 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. |
| doi_str_mv | 10.1016/j.synthmet.2005.09.033 |
| format | Article |
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n-C
3H
7)
4N[Fe
IIFe
III(dto)
3] (dto
=
C
2O
2S
2), 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.</description><identifier>ISSN: 0379-6779</identifier><identifier>EISSN: 1879-3290</identifier><identifier>DOI: 10.1016/j.synthmet.2005.09.033</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Magnetic measurements ; Magnetic phase transition</subject><ispartof>Synthetic metals, 2005-12, Vol.155 (3), p.703-706</ispartof><rights>2005 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3063-d16495c61d78932d0d98b83d16cc7b43532e38dc8b5d8aa851923cbf6e81085b3</citedby><cites>FETCH-LOGICAL-c3063-d16495c61d78932d0d98b83d16cc7b43532e38dc8b5d8aa851923cbf6e81085b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.synthmet.2005.09.033$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Kashima, I.</creatorcontrib><creatorcontrib>Okubo, M.</creatorcontrib><creatorcontrib>Qno, Y.</creatorcontrib><creatorcontrib>Itoi, M.</creatorcontrib><creatorcontrib>Kida, N.</creatorcontrib><creatorcontrib>Hikita, M.</creatorcontrib><creatorcontrib>Enomoto, M.</creatorcontrib><creatorcontrib>Kojima, N.</creatorcontrib><title>Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran</title><title>Synthetic metals</title><description>Iron mixed-valence complex, (
n-C
3H
7)
4N[Fe
IIFe
III(dto)
3] (dto
=
C
2O
2S
2), 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.</description><subject>Magnetic measurements</subject><subject>Magnetic phase transition</subject><issn>0379-6779</issn><issn>1879-3290</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNqFkMtOwzAURC0EEuXxC8grdgl23Dj2DsRbQmIDa8uxb6irxE7ttLR_j6vCmtVcXc2MNAehK0pKSii_WZZp56fFAFNZEVKXRJaEsSM0o6KRBaskOUYzwvLNm0aeorOUloQQKqt6hlZPEGMY9JeHyaUBa2-xmxIeF2EKhfN2bcBi6DowE3YeVw_YxeDx4LZgi43uwRvAJgxjD9us66wWf7tpcagwi9zuDE5jjo27qP0FOul0n-DyV8_R59Pjx_1L8fb-_Hp_91YYRjgrLOVzWRtObSMkqyyxUrSC5bcxTTtnNauACWtEW1uhtajzHmbajoOgRNQtO0fXh94xhtUa0qQGlwz0vfYQ1klVgjNeNSwb-cFoYkgpQqfG6AYdd4oStSesluqPsNoTVkSqTDgHbw9ByDM2DqJKxu15WBczLmWD-6_iB1bPiqk</recordid><startdate>20051215</startdate><enddate>20051215</enddate><creator>Kashima, I.</creator><creator>Okubo, M.</creator><creator>Qno, Y.</creator><creator>Itoi, M.</creator><creator>Kida, N.</creator><creator>Hikita, M.</creator><creator>Enomoto, M.</creator><creator>Kojima, N.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20051215</creationdate><title>Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran</title><author>Kashima, I. ; Okubo, M. ; Qno, Y. ; Itoi, M. ; Kida, N. ; Hikita, M. ; Enomoto, M. ; Kojima, N.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3063-d16495c61d78932d0d98b83d16cc7b43532e38dc8b5d8aa851923cbf6e81085b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Magnetic measurements</topic><topic>Magnetic phase transition</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kashima, I.</creatorcontrib><creatorcontrib>Okubo, M.</creatorcontrib><creatorcontrib>Qno, Y.</creatorcontrib><creatorcontrib>Itoi, M.</creatorcontrib><creatorcontrib>Kida, N.</creatorcontrib><creatorcontrib>Hikita, M.</creatorcontrib><creatorcontrib>Enomoto, M.</creatorcontrib><creatorcontrib>Kojima, N.</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Synthetic metals</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kashima, I.</au><au>Okubo, M.</au><au>Qno, Y.</au><au>Itoi, M.</au><au>Kida, N.</au><au>Hikita, M.</au><au>Enomoto, M.</au><au>Kojima, N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran</atitle><jtitle>Synthetic metals</jtitle><date>2005-12-15</date><risdate>2005</risdate><volume>155</volume><issue>3</issue><spage>703</spage><epage>706</epage><pages>703-706</pages><issn>0379-6779</issn><eissn>1879-3290</eissn><abstract>Iron mixed-valence complex, (
n-C
3H
7)
4N[Fe
IIFe
III(dto)
3] (dto
=
C
2O
2S
2), 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.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.synthmet.2005.09.033</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Magnetic measurements Magnetic phase transition |
| title | Ferromagnetism and its photo-induced effect in 2D iron mixed-valence complex coupled with photochromic spiropyran |
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