Cooperative host/guest interactions via counterion assisted chelation: Pseudorotaxanes from supramolecular cryptands

被引：82

作者：

Jones, JW

Zakharov, LN

Rheingold, AL

Gibson, HW ^{[1
]}

机构：

[1] Virginia Polytech Inst & State Univ, Dept Chem, Blacksburg, VA 24061 USA

[2] Univ Delaware, Dept Chem, Newark, DE 19716 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2002年 / 124卷 / 45期

关键词：

D O I：

10.1021/ja028306o

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Addition of di- or tritopic hydrogen bond accepting anions to solutions of bis(5-hydroxymethyl-1,3-phenylene)-32-crown-10 and paraquat di(hexafluorophosphate) serves to enhance host/guest interaction. In particular, addition of Et4N+CF3COO- effectively boosts Ka 14-fold, as estimated by 1H NMR studies. Similar increases in apparent Ka values are observed upon addition of n-Bu4N+OTs-. Evidenced by crystal structures, the increased association results from chelation of the OH moieties of the crown by the di- or tritopic anions, forming supramolecular bicyclic macrocycles and stabilizing the complex in a cooperative manner. Copyright © 2002 American Chemical Society.

引用

页码：13378 / 13379

页数：2

共 11 条

[1] COMPLEXATION OF PARAQUAT AND DIQUAT BY A BISMETAPHENYLENE-32-CROWN-10 DERIVATIVE [J].