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An insight into the disorder properties of the α-cyclodextrin polyiodide inclusion complex with Sr2+ ion: Dielectric, DSC and FT-Raman spectroscopy studies

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dc.contributor.author Charalampopoulos, VG en
dc.contributor.author Papaioannou, JC en
dc.contributor.author Viras, K en
dc.contributor.author Karayianni, HS en
dc.contributor.author Kakali, G en
dc.date.accessioned 2014-03-01T01:32:44Z
dc.date.available 2014-03-01T01:32:44Z
dc.date.issued 2010 en
dc.identifier.issn 1061-0278 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/20208
dc.subject cyclodextrin inclusion complexes en
dc.subject dielectric relaxation en
dc.subject disorder phenomena en
dc.subject pentaiodide transformations en
dc.subject Raman scattering en
dc.subject.classification Chemistry, Multidisciplinary en
dc.subject.other BETA-CYCLODEXTRIN en
dc.subject.other X-RAY en
dc.subject.other IMPEDANCE SPECTROSCOPY en
dc.subject.other NEUTRON-DIFFRACTION en
dc.subject.other GRAMICIDIN CHANNEL en
dc.subject.other CRYSTAL-STRUCTURES en
dc.subject.other CHAIN COMPLEXES en
dc.subject.other RELAXATION en
dc.subject.other IODINE en
dc.subject.other UNDECAHYDRATE en
dc.title An insight into the disorder properties of the α-cyclodextrin polyiodide inclusion complex with Sr2+ ion: Dielectric, DSC and FT-Raman spectroscopy studies en
heal.type journalArticle en
heal.identifier.primary 10.1080/10610278.2010.487563 en
heal.identifier.secondary http://dx.doi.org/10.1080/10610278.2010.487563 en
heal.language English en
heal.publicationDate 2010 en
heal.abstract At T250K, the polyiodide inclusion complex (-cyclodextrin)2 center dot Sr0.5 center dot I5 center dot 17H2O displays two separate relaxation processes due to both the frozen-in proton motions in an otherwise ordered H-bonding network and the order-disorder transition of some normal H-bonds to flip-flop ones. At T250K, the AC-conductivity is dominated by the combinational contributions of the disordered water network, the mobile Sr2+ ions, the polyiodide charge-transfer interactions and the dehydration process. The evolution of the Raman spectroscopic data with temperature reveals the coexistence of four discrete pentaiodide forms. In form (I) (I-3 center dot I2I2 center dot I-3), the occupancy ratio (x/y) of the central I- ion differs from 50/50. In form (IIa) (I2 center dot I-center dot I2) x/y=50/50, whereas in its equivalent form (IIb) (I2 center dot I-center dot I2)* as well as in form (III) (I-3 center dot I2), x/y=100/0 (indicative of full occupancy). Through slow cooling and heating, the inverse transformations (I)(IIa) and (IIa)(I) occur, respectively. [image omitted]. en
heal.publisher TAYLOR & FRANCIS LTD en
heal.journalName Supramolecular Chemistry en
dc.identifier.doi 10.1080/10610278.2010.487563 en
dc.identifier.isi ISI:000280677200004 en
dc.identifier.volume 22 en
dc.identifier.issue 9 en
dc.identifier.spage 499 en
dc.identifier.epage 510 en


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