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

Charalampopoulos, VG; Papaioannou, JC; Viras, K; Karayianni, HS; Kakali, G

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