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Crown-linked dipyridylamino-triazine ligands and their spin-crossover iron(ii) derivatives: magnetism, photomagnetism and cooperativity

hal.structure.identifierSchool of Chemistry
dc.contributor.authorSCOTT, Hayley S.
hal.structure.identifierSchool of Chemistry
dc.contributor.authorROSS, Tamsyn M.
hal.structure.identifierSchool of Chemistry
hal.structure.identifierSchool of Chemistry
dc.contributor.authorCHILTON NICHOLAS, F.
hal.structure.identifierSchool of Chemistry
dc.contributor.authorGASS, Ian A.
hal.structure.identifierSchool of Chemistry
dc.contributor.authorMOUBARAKI, Boujemaa
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHASTANET, Guillaume
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorPARADIS, Nicolas
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLÉTARD, Jean-François
hal.structure.identifierDepartment of Chemistry [Mumbai]
dc.contributor.authorVIGNESH, Kuduva R.
hal.structure.identifierDepartment of Chemistry [Mumbai]
dc.contributor.authorRAJARAMAN, Gopalan
hal.structure.identifierSchool of Chemistry
dc.contributor.authorBATTEN, Stuart R.
hal.structure.identifierSchool of Chemistry
dc.contributor.authorMURRAY, Keith S.
dc.date.issued2013
dc.identifier.issn1477-9226
dc.description.abstractEnThe syntheses, crystallography and magnetic properties of a series of compounds of formula trans-[Fe(II)(L(1))2(NCX)2] (X = S, Se, BH3 ()), cis-[Fe(II)(L(2))(NCX)2]*CH2Cl2 (X = S, Se, BH3 ()) and trans-[Fe(II)(L(3))(NCX)2]n (X = S, Se ()) are described (L(1) = 6-chloro-N(2),N(2)-diethyl-N(4),N(4)-di(pyridin-2-yl)-1,3,5-triazine-2,4-diamine, L(2) = 6,6'-(1,4,10,13-tetraoxa-7,16-diazacyclooctadecane-7,16-diyl)bis(N(2),N(2)-diethyl-N(4),N(4)-di(pyridin-2-yl)-1,3,5-triazine-2,4-diamine, L(3) = 6,6'-(1,4,10,13-tetraoxa-7,16-diazacyclooctadecane-7,16-diyl)bis(N(2),N(2),N(4),N(4)-tetra(pyridin-2-yl)-1,3,5-triazine-2,4-diamine)). The magnetostructural properties of have been probed in detail by variable temperature magnetic measurements and crystallographic methods. display mononuclear structures while and form 1-D chain structures. Complexes have the potential to form 1D-chains via L(2) bridging, but instead form mononuclear complexes. Magnetic studies show that complexes , , and remain in the high-spin (HS) state at all temperatures. An aged, dry, powdered sample of gives an abrupt HS to LS transition (T1/2 = 200 K), while a freshly prepared, powdered sample of *1.5H2O displays thermal hysteresis (Δ = 7 K). Complexes , and undergo a gradual spin transition with T1/2 values of 100 K, 150 K and 130 K, respectively. Cooperativity parameters are compared, with showing cooperativity (positive C) and and showing anticooperativity. Photomagnetic LIESST (light induced excited spin state trapping) studies were performed on complexes and and reveal T(LIESST) values lower than 60 K. An attempt has been made to understand the electronic structure of complex and its cooperativity behaviour using density functional methods, the calculations reproducing the sign and, in part, the magnitude of the cooperativity.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.title.enCrown-linked dipyridylamino-triazine ligands and their spin-crossover iron(ii) derivatives: magnetism, photomagnetism and cooperativity
dc.typeArticle de revue
dc.identifier.doi10.1039/c3dt51839f
dc.subject.halChimie/Matériaux
bordeaux.journalDalton Transactions
bordeaux.page16494-16509
bordeaux.volume42
bordeaux.issue47
bordeaux.peerReviewedoui
hal.identifierhal-00906436
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00906436v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Dalton%20Transactions&rft.date=2013&rft.volume=42&rft.issue=47&rft.spage=16494-16509&rft.epage=16494-16509&rft.eissn=1477-9226&rft.issn=1477-9226&rft.au=SCOTT,%20Hayley%20S.&ROSS,%20Tamsyn%20M.&CHILTON%20NICHOLAS,%20F.&GASS,%20Ian%20A.&MOUBARAKI,%20Boujemaa&rft.genre=article


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