Skip to Main Content
Variations in the heterogeneity of the decay of the fluorescence in six procyanidin dimersAuthor(s): Donghwan Cho; Rujiang Tian; Lawrence J. Porter; Richard W. Hemingway; Wayne L. Mattice
Source: Journal of the American Chemical Society 112(11):4273-4277
Publication Series: Miscellaneous Publication
PDF: View PDF (1.1 MB)
DescriptionThe decay of the fluorescence has been measured in 1,4-dioxane for six dimers of (2R,3R)-(-)-epicatechin and (2R,3S)-(+)-catechin, hereafter denoted simply epicatechin and catechin. The dimers are epicatechin-(4β→8)-catechin, epicatechin-(4β→8)-epicatechin, catechin-( 4α→8)-catechin, catechin-(4α→8)-epicatechin, epicatechin-(4β→6)-epicatechin, and epicatechin-(4β→8;2β→O→7)-epicatechin. The monomers and the bridged dimer have a fluorescence that decays as a single exponential. The remaining five dimers have a heterogeneous decay that can be described by the sum of two exponentials. The heterogeneity is most apparent in the two dimers with 4α→8 interflavan bonds. In view of the molecular origin of the heterogeneous decay in the presence of two rotational isomers at the interflavan bond, polymeric procyanidins with predominantly α stereochemistry for the interflavan bond at C(4) should be more disordered and more compact than those with predominantly β stereochemistry.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationCho, Donghwan; Tian, Rujiang; Porter, Lawrence J.; Hemingway, Richard W.; Mattice, Wayne L. 1990. Variations in the heterogeneity of the decay of the fluorescence in six procyanidin dimers. Journal of the American Chemical Society 112(11):4273-4277
- Recent Advances in the Chemistry of Condensed Tannins
- Oligomeric flavanoids. Part 26. Structure and synthesis of the first profisetinidins with epifisetinidol constituent units
- Use of the fluorescence quantum yield for the determination of the number-average molecular weight of polymers of epicatechin with 4β→8 interflavin bonds
XML: View XML