Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 박준우 | * |
dc.contributor.author | 이종목 | * |
dc.date.accessioned | 2018-06-02T08:15:15Z | - |
dc.date.available | 2018-06-02T08:15:15Z | - |
dc.date.issued | 1996 | * |
dc.identifier.issn | 0923-0750 | * |
dc.identifier.other | OAK-16971 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/244454 | - |
dc.description.abstract | The effects of cyclodextrins (CDs) on the monomer-dimer equilibria of 1,1′ -dialkylviologen radical cations (Cn Cn V.+ : n = 1-5) and one-electron reduced 1,1′-bis(3-sulfopropyl)viologen (SPV) were investigated spectroelectrochemically. The dimerization is enhanced upon addition of γ-CD, while the addition of α-CD and β-CD suppresses the dimerization. This is attributed to the stabilization of dimers by the inclusion of the dimer in the cavity of γ-CD. From the dependence of the apparent dimerization constants (K′D) on the concentration of γ-CD, the association constants of the monomer (KC1) and dimer (KC2) with γ-CD were determined. The KC1 value increases slightly, from 5 M-1 for n = 1 to 35 M-1 for n = 5, as the length of the alkyl substituents of viologen increases. The KC2 value depends strongly on the alkyl substituents giving the smallest value of 85 M-1 for (SPV.-)2 and the largest one of 3500 M-1 for (C4C4V.+)2. These results, together with the difference in UV-vis absorption spectra obtained in the absence and in the presence of γ-CD, suggest that the alkyl substituents and part of the bipyridine ring of viologen radicals are included in the γ-CD cavity forming dimers in which the bipyridine rings are stacked at an oblique angle. | * |
dc.language | English | * |
dc.title | γ-cyclodextrin-enhanced dimerization of viologen radicals | * |
dc.type | Article | * |
dc.relation.issue | 4 | * |
dc.relation.volume | 26 | * |
dc.relation.index | SCI | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.startpage | 219 | * |
dc.relation.lastpage | 232 | * |
dc.relation.journaltitle | Journal of Inclusion Phenomena and Molecular Recognition in Chemistry | * |
dc.identifier.scopusid | 2-s2.0-0030497866 | * |
dc.author.google | Lee C. | * |
dc.author.google | Moon M.S. | * |
dc.author.google | Park J.W. | * |
dc.contributor.scopusid | 박준우(35332923800) | * |
dc.contributor.scopusid | 이종목(55812178500) | * |
dc.date.modifydate | 20240415121732 | * |