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dc.contributor.author박준우-
dc.date.accessioned2018-05-18T08:14:58Z-
dc.date.available2018-05-18T08:14:58Z-
dc.date.issued2005-
dc.identifier.issn1010-6030-
dc.identifier.otherOAK-2826-
dc.identifier.urihttps://dspace.ewha.ac.kr/handle/2015.oak/243088-
dc.description.abstractA hemicyanine dye, 4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide (4-ASP) forms inclusion complexes with β-cyclodextrin (β-CD) and modified β-CDs having a sulfonaphthyl (β-CD-NS) or a pyrenyl group (β-CD-py) at the primary face. The complexation constants in water were determined by fluorescence titration and found to be 4.7 × 104 M-1 with β-CD-NS and 3.6 × 104 M-1 with β-CD-py, while it is 730 M-1 with β-CD. Compared to 4-ASP in water, the emission maximum of 4-ASP of the inclusion complexes is blue-shifted by about 20 nm, and emission intensity is higher by 6.4-fold for β-CD, 14-fold for β-CD-NS and as much as 56 fold for β-CD-py complexes. These are much greater than the 3 nm blue shift and 3.3-fold enhancement of emission intensity when the solvent medium is changed to CH3OH. Good overlap between the emission bands of β-CD-appended aromatic groups and absorption band of 4-ASP results in the excitation energy transfer from the excited aromatic groups to 4-ASP and the efficiency of the intra-complex transfer is near 100%. 1H NMR spectra and molecular modeling of the 4-ASP complexes with β-CD-NS and β-CD-py indicated that N-methyl-pyridinium moiety of 4-ASP is outside the primary face of β-CD cavity. The interaction between the N-methyl-pyridinium group and the appended aromatic groups appear to result in the high stability of the complexes. The high fluorescence intensity of 4-ASP in the complexes with β-CD-NS and β-CD-py was explained in terms of hindrance of the formation of the non-fluorescent twisted intramolecular charge transfer (TICT) states by the interaction and confinement in cavity. © 2005 Elsevier B.V. All rights reserved.-
dc.languageEnglish-
dc.titleEfficient inclusion complexation and intra-complex excitation energy transfer between aromatic group-modified β-cyclodextrins and a hemicyanine dye-
dc.typeArticle-
dc.relation.issue3 SPEC. ISS.-
dc.relation.volume173-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.startpage271-
dc.relation.lastpage278-
dc.relation.journaltitleJournal of Photochemistry and Photobiology A: Chemistry-
dc.identifier.doi10.1016/j.jphotochem.2005.04.006-
dc.identifier.wosidWOS:000230610900007-
dc.identifier.scopusid2-s2.0-21644438520-
dc.author.googlePark J.W.-
dc.author.googleLee S.Y.-
dc.author.googleKim S.M.-
dc.contributor.scopusid박준우(35332923800;8141958400)-
dc.date.modifydate20180517114920-
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자연과학대학 > 화학·나노과학전공 > Journal papers
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