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[K<sub>2</sub>Mn<sub>5</sub>{Mo(CN)<sub>7</sub>}<sub>3</sub>]: an open framework magnet with four Tc conversions orchestrated by guests and thermal history

hal.structure.identifierLaboratoire de chimie de coordination [LCC]
dc.contributor.authorMILON, Julie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUIONNEAU, Philippe
hal.structure.identifierLaboratoire de chimie de coordination [LCC]
dc.contributor.authorGUYARD-DUHAYON, Carine
hal.structure.identifierLaboratoire de chimie de coordination [LCC]
dc.contributor.authorSUTTER, Jean-Pascal
dc.date.issued2011
dc.identifier.issn1144-0546
dc.description.abstractEnThe 3D metal organic framework of formula [K<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>Mn<sub>5</sub>(H<sub>2</sub>O)<sub>8</sub>(MeCN){Mo(CN)<sub>7</sub>}<sub>3</sub>]*2H<sub>2</sub>O, 1a, gives rise to four ferri-magnets with distinct sets of attributes attained by controlled and sequential variation of its sorption state and a structural transition. 1a is prepared by solution (H<sub>2</sub>O) chemistry at ambient conditions by assembling the heptacyanomolybdate building unit {Mo(CN)<sub>7</sub>}<sup>4−</sup> with Mn(II) in the presence of MeCN. The resulting open-framework is achieved only with the small cyanide ligand that also ensures noteworthy magnetic performances. Its potential porosity (28% of solvent accessible volume) is sufficient to observe fast and efficient sorption processes that permit converting the attributes (<i>T</i><sub>c</sub> and <i>H</i><sub>c</sub>) of the corresponding magnets. It is shown that the magnetic ordering temperature <i>T</i><sub>c</sub> increases from 61 K (for 1a) to 82 K after solvent release whereas this <i>T</i><sub>c</sub> is 72 K upon the structural transition taking place for the guest-free magnet. A fourth magnet with <i>T</i><sub>c</sub> = 61 K is generated by H<sub>2</sub>O uptake. Concomitantly the coercive fields <i>H</i><sub>c</sub> vary between 70 and 1770 Oe. These processes, including the structural phase transition, are reversible by means of basic levers, <i>i.e.</i> thermal processing and H<sub>2</sub>O sorption, allowing inter-conversion among three of the four magnets. The crystal structure analysis for 1a, the XRPD for 1b, 1c, and 1d, the magnetic behavior for the four magnets, and TGA data are reported.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.title.en[K<sub>2</sub>Mn<sub>5</sub>{Mo(CN)<sub>7</sub>}<sub>3</sub>]: an open framework magnet with four Tc conversions orchestrated by guests and thermal history
dc.typeArticle de revue
dc.identifier.doi10.1039/C0NJ00860E
dc.subject.halChimie/Matériaux
bordeaux.journalNew Journal of Chemistry
bordeaux.page1211-1218
bordeaux.volume35
bordeaux.issue6
bordeaux.peerReviewedoui
hal.identifierhal-00598707
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00598707v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=New%20Journal%20of%20Chemistry&amp;rft.date=2011&amp;rft.volume=35&amp;rft.issue=6&amp;rft.spage=1211-1218&amp;rft.epage=1211-1218&amp;rft.eissn=1144-0546&amp;rft.issn=1144-0546&amp;rft.au=MILON,%20Julie&amp;GUIONNEAU,%20Philippe&amp;GUYARD-DUHAYON,%20Carine&amp;SUTTER,%20Jean-Pascal&amp;rft.genre=article


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