Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]
Identifieur interne : 000061 ( Maroc/Analysis ); précédent : 000060; suivant : 000062Re-investigation of the spin crossover phenomenon in the ferrous complex [Fe(HB(pz)3)2]
Auteurs : Lionel Salmon [France] ; Gbor Molnr [France] ; Saioa Cobo [France] ; Pascal Ouli [France] ; Michel Etienne [France] ; Tarik Mahfoud [France, Maroc] ; Philippe Demont [France] ; Akira Eguchi [Japon] ; Hiroshi Watanabe [Japon] ; Koichiro Tanaka [Japon] ; Azzedine Bousseksou [France]Source :
- New Journal of Chemistry [ 1144-0546 ] ; 2009.
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
Affiliations:
- France, Japon, Maroc
- Midi-Pyrénées, Occitanie (région administrative), Région du Kansai
- Kyoto, Toulouse
- Université de Kyoto
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wicri:rule="url">France</country></affiliation></author><author wicri:is="90%"><name sortKey="Mahfoud, Tarik" sort="Mahfoud, Tarik" uniqKey="Mahfoud T" first="Tarik" last="Mahfoud">Tarik Mahfoud</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, Toulouse</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Universit de Toulouse, UPS, INPT, LCC, 31077 Toulouse</wicri:regionArea><placeName><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation><affiliation wicri:level="1"><country 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xml:lang="fr">Japon</country><wicri:regionArea>Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Sakyo-ku</wicri:regionArea><orgName type="university">Université de Kyoto</orgName><placeName><settlement type="city">Kyoto</settlement><region type="prefecture">Région du Kansai</region></placeName></affiliation></author><author wicri:is="90%"><name sortKey="Watanabe, Hiroshi" sort="Watanabe, Hiroshi" uniqKey="Watanabe H" first="Hiroshi" last="Watanabe">Hiroshi Watanabe</name><affiliation wicri:level="4"><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Sakyo-ku</wicri:regionArea><orgName type="university">Université de Kyoto</orgName><placeName><settlement type="city">Kyoto</settlement><region type="prefecture">Région du Kansai</region></placeName></affiliation></author><author wicri:is="90%"><name sortKey="Tanaka, Koichiro" sort="Tanaka, Koichiro" uniqKey="Tanaka K" first="Koichiro" last="Tanaka">Koichiro Tanaka</name><affiliation wicri:level="4"><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Sakyo-ku</wicri:regionArea><orgName type="university">Université de Kyoto</orgName><placeName><settlement type="city">Kyoto</settlement><region type="prefecture">Région du Kansai</region></placeName></affiliation></author><author wicri:is="90%"><name sortKey="Bousseksou, Azzedine" sort="Bousseksou, Azzedine" uniqKey="Bousseksou A" first="Azzedine" last="Bousseksou">Azzedine Bousseksou</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, Toulouse</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Universit de Toulouse, UPS, INPT, LCC, 31077 Toulouse</wicri:regionArea><placeName><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation><affiliation wicri:level="1"><country wicri:rule="url">France</country></affiliation></author></analytic><monogr></monogr><series><title level="j">New Journal of Chemistry</title><title level="j" type="abbrev">New J. Chem.</title><idno type="ISSN">1144-0546</idno><idno type="eISSN">1369-9261</idno><imprint><publisher>The Royal Society of Chemistry.</publisher><date type="published" when="2009">2009</date><biblScope unit="volume"></biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="1283">1283</biblScope><biblScope unit="page" to="1289">1289</biblScope></imprint><idno type="ISSN">1144-0546</idno></series><idno type="istex">820FF69C40F7B124AE0880577CAEA813DE62F872</idno><idno type="DOI">10.1039/b902811k</idno><idno type="ms-id">b902811k</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1144-0546</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><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></front></TEI><affiliations><list><country><li>France</li><li>Japon</li><li>Maroc</li></country><region><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li><li>Région du Kansai</li></region><settlement><li>Kyoto</li><li>Toulouse</li></settlement><orgName><li>Université de Kyoto</li></orgName></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Salmon, Lionel" sort="Salmon, Lionel" uniqKey="Salmon L" first="Lionel" last="Salmon">Lionel Salmon</name></region><name sortKey="Bousseksou, Azzedine" sort="Bousseksou, Azzedine" uniqKey="Bousseksou A" first="Azzedine" last="Bousseksou">Azzedine Bousseksou</name><name sortKey="Bousseksou, Azzedine" sort="Bousseksou, Azzedine" uniqKey="Bousseksou A" first="Azzedine" last="Bousseksou">Azzedine Bousseksou</name><name sortKey="Bousseksou, Azzedine" sort="Bousseksou, Azzedine" uniqKey="Bousseksou A" first="Azzedine" last="Bousseksou">Azzedine Bousseksou</name><name sortKey="Cobo, Saioa" sort="Cobo, Saioa" uniqKey="Cobo S" first="Saioa" last="Cobo">Saioa Cobo</name><name sortKey="Cobo, Saioa" sort="Cobo, Saioa" uniqKey="Cobo S" first="Saioa" last="Cobo">Saioa Cobo</name><name sortKey="Cobo, Saioa" sort="Cobo, Saioa" uniqKey="Cobo S" first="Saioa" last="Cobo">Saioa Cobo</name><name sortKey="Demont, Philippe" sort="Demont, Philippe" uniqKey="Demont P" first="Philippe" last="Demont">Philippe Demont</name><name sortKey="Etienne, Michel" sort="Etienne, Michel" uniqKey="Etienne M" first="Michel" last="Etienne">Michel Etienne</name><name sortKey="Etienne, Michel" sort="Etienne, Michel" uniqKey="Etienne M" first="Michel" last="Etienne">Michel Etienne</name><name sortKey="Etienne, Michel" sort="Etienne, Michel" uniqKey="Etienne M" first="Michel" last="Etienne">Michel Etienne</name><name sortKey="Mahfoud, Tarik" sort="Mahfoud, Tarik" uniqKey="Mahfoud T" first="Tarik" last="Mahfoud">Tarik Mahfoud</name><name sortKey="Mahfoud, Tarik" sort="Mahfoud, Tarik" uniqKey="Mahfoud T" first="Tarik" last="Mahfoud">Tarik Mahfoud</name><name sortKey="Mahfoud, Tarik" sort="Mahfoud, Tarik" uniqKey="Mahfoud T" first="Tarik" last="Mahfoud">Tarik Mahfoud</name><name sortKey="Molnr, Gbor" sort="Molnr, Gbor" uniqKey="Molnr G" first="Gbor" last="Molnr">Gbor Molnr</name><name sortKey="Molnr, Gbor" sort="Molnr, Gbor" uniqKey="Molnr G" first="Gbor" last="Molnr">Gbor Molnr</name><name sortKey="Molnr, Gbor" sort="Molnr, Gbor" uniqKey="Molnr G" first="Gbor" last="Molnr">Gbor Molnr</name><name sortKey="Ouli, Pascal" sort="Ouli, Pascal" uniqKey="Ouli P" first="Pascal" last="Ouli">Pascal Ouli</name><name sortKey="Ouli, Pascal" sort="Ouli, Pascal" uniqKey="Ouli P" first="Pascal" last="Ouli">Pascal Ouli</name><name sortKey="Ouli, Pascal" sort="Ouli, Pascal" uniqKey="Ouli P" first="Pascal" last="Ouli">Pascal Ouli</name><name sortKey="Salmon, Lionel" sort="Salmon, Lionel" uniqKey="Salmon L" first="Lionel" last="Salmon">Lionel Salmon</name><name sortKey="Salmon, Lionel" sort="Salmon, Lionel" uniqKey="Salmon L" first="Lionel" last="Salmon">Lionel Salmon</name></country><country name="Maroc"><noRegion><name sortKey="Mahfoud, Tarik" sort="Mahfoud, Tarik" uniqKey="Mahfoud T" first="Tarik" last="Mahfoud">Tarik Mahfoud</name></noRegion></country><country name="Japon"><region name="Région du Kansai"><name sortKey="Eguchi, Akira" sort="Eguchi, Akira" uniqKey="Eguchi A" first="Akira" last="Eguchi">Akira Eguchi</name></region><name sortKey="Tanaka, Koichiro" sort="Tanaka, Koichiro" uniqKey="Tanaka K" first="Koichiro" last="Tanaka">Koichiro Tanaka</name><name sortKey="Watanabe, Hiroshi" sort="Watanabe, Hiroshi" uniqKey="Watanabe H" first="Hiroshi" last="Watanabe">Hiroshi Watanabe</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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