| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5225290 | Tetrahedron | 2007 | 7 Pages |
Abstract
Novel crownophanes with three pyridine moieties (pyridinocrownophanes 4 and 5) were prepared by means of intramolecular [2+2] photocycloaddition of vinylpyridine derivatives. In the liquid-liquid extraction of heavy metal cations, 4 and 5 exhibited high efficiency toward Ag+. Comparing the high extractability and complexing stability constant for Ag+ to those of the corresponding pyridinocrownophanes 2 and 3 and observing the 1H NMR spectra in the presence of Ag+, the ethereal oxygen atoms and the three nitrogen atoms were found efficiently and cooperatively to act as ligating sites.
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Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Seiichi Inokuma, Takayaki Yatsuzuka, Shinji Ohtsuki, Shota Hino, Jun Nishimura,