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Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]

Identifieur interne : 001861 ( Istex/Corpus ); précédent : 001860; suivant : 001862

Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]

Auteurs : Lionel Salmon ; Gbor Molnr ; Saioa Cobo ; Pascal Ouli ; Michel Etienne ; Tarik Mahfoud ; Philippe Demont ; Akira Eguchi ; Hiroshi Watanabe ; Koichiro Tanaka ; Azzedine Bousseksou

Source :

RBID : ISTEX:820FF69C40F7B124AE0880577CAEA813DE62F872

Abstract

The temperature dependence of the magnetic susceptibility, optical reflectivity and electrical conductivity of [Fe(HB(pz)3)2] (pz = pyrazolyl) revealed irreversible changes in the material during the low-spin to high-spin transition when the as-prepared sample was heated above 400 K for the first time. During this first heating sequence, the initially fine powder sample became coarse, and its crystal structure changed from tetragonal to monoclinic. Single-crystals of the monoclinic form suitable for X-ray analysis could be isolated after the first thermal cycle, and their structure was resolved in the P21/n (Z = 4) space group. Successive cooling and heating cycles did not lead to further modification of the crystal structure, and the temperature dependence of the physical properties remained invariable. Remarkably, the electrical conductivity of the sample measured at 293 K dropped from 6.1 108 to 2.1 1011 S m1 following the first thermal cyclesuggesting possible applications of this material in read-only memory devices (ROM).

Url:
DOI: 10.1039/b902811k

Links to Exploration step

ISTEX:820FF69C40F7B124AE0880577CAEA813DE62F872

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<div type="abstract">The temperature dependence of the magnetic susceptibility, optical reflectivity and electrical conductivity of [Fe(HB(pz)3)2] (pz = pyrazolyl) revealed irreversible changes in the material during the low-spin to high-spin transition when the as-prepared sample was heated above 400 K for the first time. During this first heating sequence, the initially fine powder sample became coarse, and its crystal structure changed from tetragonal to monoclinic. Single-crystals of the monoclinic form suitable for X-ray analysis could be isolated after the first thermal cycle, and their structure was resolved in the P21/n (Z = 4) space group. Successive cooling and heating cycles did not lead to further modification of the crystal structure, and the temperature dependence of the physical properties remained invariable. Remarkably, the electrical conductivity of the sample measured at 293 K dropped from 6.1 108 to 2.1 1011 S m1 following the first thermal cyclesuggesting possible applications of this material in read-only memory devices (ROM).</div>
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<note>Electronic supplementary information (ESI) available: Photographs showing the temperature dependence of the color of 1, digital images recorded during the first heating cycle, powder X-ray diffractograms, and bond distance and bond angle tables. CCDC 729351729353. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/b902811k</note>
<note>The electrical conductivity of the complex [Fe(HB(pz)3)2] shows significant and irreversible changes during the low-spin to high-spin transition.</note>
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<title>Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)
<inf>3</inf>
)
<inf>2</inf>
]
<fnoteref></fnoteref>
<footnote id="fn1">Electronic supplementary information (ESI) available: Photographs showing the temperature dependence of the color of
<compoundref>1</compoundref>
, digital images recorded during the first heating cycle, powder X-ray diffractograms, and bond distance and bond angle tables. CCDC 729351–729353. For ESI and crystallographic data in CIF or other electronic format see DOI:
<url>10.1039/b902811k</url>
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</org>
<address>
<postcode>31077 Toulouse</postcode>
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<email> </email>
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<art-toc-entry>
<ictext>The electrical conductivity of the complex [Fe(HB(pz)
<inf>3</inf>
)
<inf>2</inf>
] shows significant and irreversible changes during the low-spin to high-spin transition.</ictext>
<icgraphic id="ga" src="ga"></icgraphic>
</art-toc-entry>
<abstract>
<p>The temperature dependence of the magnetic susceptibility, optical reflectivity and electrical conductivity of [Fe(HB(pz)
<inf>3</inf>
)
<inf>2</inf>
] (pz = pyrazolyl) revealed irreversible changes in the material during the low-spin to high-spin transition when the “as-prepared” sample was heated above ∼400 K for the first time. During this first heating sequence, the initially fine powder sample became coarse, and its crystal structure changed from tetragonal to monoclinic. Single-crystals of the monoclinic form suitable for X-ray analysis could be isolated after the first thermal cycle, and their structure was resolved in the
<it>P</it>
2
<inf>1</inf>
/
<it>n</it>
(
<it>Z</it>
= 4) space group. Successive cooling and heating cycles did not lead to further modification of the crystal structure, and the temperature dependence of the physical properties remained invariable. Remarkably, the electrical conductivity of the sample measured at 293 K dropped from 6.1 × 10
<sup>−8</sup>
to 2.1 × 10
<sup>−11</sup>
S m
<sup>−1</sup>
following the first thermal cycle—suggesting possible applications of this material in read-only memory devices (ROM).</p>
</abstract>
</art-front>
<art-back>
<ack>
<p>The authors are grateful to L. Vendrier, L. Rechignat, J.-F. Meunier (LCC) and J. Jaud (CEMES) for technical assistance. This work was financially supported by the ANR NANOMOL project.</p>
</ack>
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<title>Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]</title>
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<title>Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]</title>
</titleInfo>
<name type="personal">
<namePart type="given">Lionel</namePart>
<namePart type="family">Salmon</namePart>
<affiliation>CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, Toulouse, France</affiliation>
<affiliation>Universit de Toulouse, UPS, INPT, LCC, 31077 Toulouse, France</affiliation>
<affiliation>E-mail: boussek@lcc-toulouse.fr</affiliation>
</name>
<name type="personal">
<namePart type="given">Gbor</namePart>
<namePart type="family">Molnr</namePart>
<affiliation>CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, Toulouse, France</affiliation>
<affiliation>Universit de Toulouse, UPS, INPT, LCC, 31077 Toulouse, France</affiliation>
<affiliation>E-mail: boussek@lcc-toulouse.fr</affiliation>
</name>
<name type="personal">
<namePart type="given">Saioa</namePart>
<namePart type="family">Cobo</namePart>
<affiliation>CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, Toulouse, France</affiliation>
<affiliation>Universit de Toulouse, UPS, INPT, LCC, 31077 Toulouse, France</affiliation>
<affiliation>E-mail: boussek@lcc-toulouse.fr</affiliation>
</name>
<name type="personal">
<namePart type="given">Pascal</namePart>
<namePart type="family">Ouli</namePart>
<affiliation>CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, Toulouse, France</affiliation>
<affiliation>Universit de Toulouse, UPS, INPT, LCC, 31077 Toulouse, France</affiliation>
<affiliation>E-mail: boussek@lcc-toulouse.fr</affiliation>
</name>
<name type="personal">
<namePart type="given">Michel</namePart>
<namePart type="family">Etienne</namePart>
<affiliation>CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, Toulouse, France</affiliation>
<affiliation>Universit de Toulouse, UPS, INPT, LCC, 31077 Toulouse, France</affiliation>
<affiliation>E-mail: boussek@lcc-toulouse.fr</affiliation>
</name>
<name type="personal">
<namePart type="given">Tarik</namePart>
<namePart type="family">Mahfoud</namePart>
<affiliation>CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, Toulouse, France</affiliation>
<affiliation>Universit de Toulouse, UPS, INPT, LCC, 31077 Toulouse, France</affiliation>
<affiliation>School of Science and Engineering, Al Akhawayn University in Ifrane, 53000 Ifrane, Morocco</affiliation>
<affiliation>E-mail: boussek@lcc-toulouse.fr</affiliation>
</name>
<name type="personal">
<namePart type="given">Philippe</namePart>
<namePart type="family">Demont</namePart>
<affiliation>Laboratoire de Physique des Polymres-CIRIMAT, CNRS UMR-5085, 31062 Toulouse Cedex, Universit Toulouse III, 118 Route de Narbonne, France</affiliation>
</name>
<name type="personal">
<namePart type="given">Akira</namePart>
<namePart type="family">Eguchi</namePart>
<affiliation>Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Sakyo-ku, Japan</affiliation>
</name>
<name type="personal">
<namePart type="given">Hiroshi</namePart>
<namePart type="family">Watanabe</namePart>
<affiliation>Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Sakyo-ku, Japan</affiliation>
</name>
<name type="personal">
<namePart type="given">Koichiro</namePart>
<namePart type="family">Tanaka</namePart>
<affiliation>Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Sakyo-ku, Japan</affiliation>
</name>
<name type="personal">
<namePart type="given">Azzedine</namePart>
<namePart type="family">Bousseksou</namePart>
<affiliation>CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, Toulouse, France</affiliation>
<affiliation>Universit de Toulouse, UPS, INPT, LCC, 31077 Toulouse, France</affiliation>
<affiliation>E-mail: boussek@lcc-toulouse.fr</affiliation>
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<publisher>The Royal Society of Chemistry.</publisher>
<dateIssued encoding="w3cdtf">2009</dateIssued>
<copyrightDate encoding="w3cdtf">2009</copyrightDate>
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<language>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
<languageTerm type="code" authority="rfc3066">en</languageTerm>
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<abstract>The temperature dependence of the magnetic susceptibility, optical reflectivity and electrical conductivity of [Fe(HB(pz)3)2] (pz = pyrazolyl) revealed irreversible changes in the material during the low-spin to high-spin transition when the as-prepared sample was heated above 400 K for the first time. During this first heating sequence, the initially fine powder sample became coarse, and its crystal structure changed from tetragonal to monoclinic. Single-crystals of the monoclinic form suitable for X-ray analysis could be isolated after the first thermal cycle, and their structure was resolved in the P21/n (Z = 4) space group. Successive cooling and heating cycles did not lead to further modification of the crystal structure, and the temperature dependence of the physical properties remained invariable. Remarkably, the electrical conductivity of the sample measured at 293 K dropped from 6.1 108 to 2.1 1011 S m1 following the first thermal cyclesuggesting possible applications of this material in read-only memory devices (ROM).</abstract>
<note type="footnote" displayLabel="fn1">Electronic supplementary information (ESI) available: Photographs showing the temperature dependence of the color of 1, digital images recorded during the first heating cycle, powder X-ray diffractograms, and bond distance and bond angle tables. CCDC 729351729353. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/b902811k</note>
<note>The electrical conductivity of the complex [Fe(HB(pz)3)2] shows significant and irreversible changes during the low-spin to high-spin transition.</note>
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<title>New Journal of Chemistry</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>New J. Chem.</title>
</titleInfo>
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<originInfo>
<publisher>The Royal Society of Chemistry.</publisher>
</originInfo>
<identifier type="ISSN">1144-0546</identifier>
<identifier type="eISSN">1369-9261</identifier>
<identifier type="coden">NJCHE5</identifier>
<identifier type="RSC sercode">NJ</identifier>
<part>
<date>2009</date>
<detail type="volume">
<caption>vol.</caption>
<number></number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>6</number>
</detail>
<extent unit="pages">
<start>1283</start>
<end>1289</end>
<total>7</total>
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<identifier type="istex">820FF69C40F7B124AE0880577CAEA813DE62F872</identifier>
<identifier type="DOI">10.1039/b902811k</identifier>
<identifier type="ms-id">b902811k</identifier>
<accessCondition type="use and reproduction" contentType="copyright">This journal is © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique</accessCondition>
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