Significant modification of the I-3(-) Lewis base character in the beta-cyclodextrin polyiodide inclusion complex with Co2+ ion: An FT-Raman investigation

Charalampopoulos, VG; Papaioannou, JC; Tsekouras, AA; Kakali, G; Karayianni, HS

dc.contributor.author	Charalampopoulos, VG	en
dc.contributor.author	Papaioannou, JC	en
dc.contributor.author	Tsekouras, AA	en
dc.contributor.author	Kakali, G	en
dc.contributor.author	Karayianni, HS	en
dc.date.accessioned	2014-03-01T02:07:02Z
dc.date.available	2014-03-01T02:07:02Z
dc.date.issued	2011	en
dc.identifier.issn	1386-1425	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29512
dc.subject	beta-Cyclodextrin inclusion complex	en
dc.subject	Raman spectroscopy	en
dc.subject	Heptaiodides	en
dc.subject	Charge-transfer	en
dc.subject	Order-disorder	en
dc.subject.classification	Spectroscopy	en
dc.subject.other	CHARGE-TRANSFER COMPLEXES	en
dc.subject.other	RAY CRYSTAL-STRUCTURES	en
dc.subject.other	ALPHA-CYCLODEXTRIN	en
dc.subject.other	X-RAY	en
dc.subject.other	DIELECTRIC-RELAXATION	en
dc.subject.other	RESONANCE RAMAN	en
dc.subject.other	AMYLOSE-IODINE	en
dc.subject.other	SPECTROSCOPY	en
dc.subject.other	SPECTRA	en
dc.subject.other	HEPTAIODIDE	en
dc.title	Significant modification of the I-3(-) Lewis base character in the beta-cyclodextrin polyiodide inclusion complex with Co2+ ion: An FT-Raman investigation	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	The beta-cyclodextrin (beta-CD) polyiodide inclusion complex (beta-CD)(2)center dot Co-0.5 center dot I-7 center dot 21H(2)O has been synthesized, characterized and further investigated via FT-Raman spectroscopy in the temperature range of 30-120 degrees C. The experimental results point to the coexistence of I-7(-) units (I-2 center dot I-3 center dot I-2) that seem not to interact with the Co2+ ions and I-7(-) units that display such interactions. The former units exhibit a disorder-order transition of both their I-2 molecules above 60 degrees C due to a symmetric charge-transfer interaction with the central I-3(-) [I-2(-) <- I-3(-) -> I-2], whereas in the latter units only one of the two I-2 molecules becomes well-ordered above 30 degrees C. The other I-2 molecule remains disordered presenting no charge-transfer phenomena. The Co2+ ion induces a considerable asymmetry on the geometry of the I-3(-) anion and a significant modification of its Lewis base character. Complementary dielectric measurements suggest no important involvement of H center dot center dot center dot I contacts in the observed modification of the I-3(-) electron-transfer properties. (C) 2011 Elsevier B.V. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY	en
dc.identifier.isi	ISI:000296827600042	en
dc.identifier.volume	83	en
dc.identifier.issue	1	en
dc.identifier.spage	279	en
dc.identifier.epage	287	en