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Concentration- and time-dependent eccentric changes in circular dichroism of saccharide-linked ethynylpyridine oligomer with copper(II) ions.

Authors
  • Abe, Hajime
  • Ohishi, Yuki
  • Inouye, Masahiko
Type
Published Article
Journal
The Journal of Organic Chemistry
Publisher
American Chemical Society
Publication Date
Jun 01, 2012
Volume
77
Issue
11
Pages
5209–5214
Identifiers
DOI: 10.1021/jo300735j
PMID: 22577964
Source
Medline
License
Unknown

Abstract

We studied the preparation and circular dichroism (CD) behavior of 2,6-pyridylene ethynylene octameric oligomer linked to a β-d-glucoside moiety with a C20-alkylene chain. The addition of Cu(OTf)(2) salt led to a remarkable enhancement of the first CD band of the oligomer, and an unexpected concentration and time dependency were observed. For example, when 1.0 × 10(-3) M of Cu(OTf)(2) was added to a 1,2-dichloroethane solution of the oligomer (5.0 × 10(-4) M, unit concentration), the CD band appeared in the positive at first and gradually inverted into the negative with time.

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