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An NMR study on the conformation of naphthalene-viologen linked compounds: Effect of flexible spacer length

Title
An NMR study on the conformation of naphthalene-viologen linked compounds: Effect of flexible spacer length
Authors
Hwang H.J.Lee S.K.Lee S.Park J.W.
Ewha Authors
박준우이상혁
SCOPUS Author ID
박준우scopusscopus; 이상혁scopus
Issue Date
1999
Journal Title
Journal of the Chemical Society. Perkin Transactions 2
ISSN
0300-9580JCR Link
Citation
no. 6, pp. 1081 - 1086
Indexed
SCOPUS WOS scopus
Abstract
The conformational equilibria of naphthalene-viologen compounds linked with a flexible polymethylene bridge [-(CH2)n-: n = 3, 5, 7, 9, 12] were examined by NMR spectroscopy and molecular modeling. The chemical shift of the donor-acceptor dyad molecules depends on the linkage length and concentration. The equilibrium constants for the intramolecular and the intermolecular complexation were obtained from the chemical shift variation with concentration at high salt concentration. The complexation-induced chemical shifts (CISs) of the intra- and intermolecular complexes are obtained for molecules of n = 3 and 5. The molecules with longer linkages (n = 9 and 12) show aggregation behavior and the critical coagulation concentrations were obtained as 1.7 and 10 mM, respectively. Comparing the NMR results with molecular modeling calculations indicates that the naphthalene moiety can take various positions and orientations with respect to the bipyridinium moieties depending on the length of the linkage.
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자연과학대학 > 화학·나노과학전공 > Journal papers
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