Calix[4]arenes containing urea and crown/urea moieties:: effects of the crown ether unit and Na+ towards anion binding ability

被引：42

作者：

Tongraung, P ^{[1
]}

Chantarasiri, N ^{[1
]}

Tuntulani, T ^{[1
]}

机构：

[1] Chulalongkorn Univ, Fac Sci, Dept Chem, Bangkok 10330, Thailand

来源：

TETRAHEDRON LETTERS | 2003年 / 44卷 / 01期

关键词：

calix[4]arene; anion binding; ion-pair enhancement;

D O I：

10.1016/S0040-4039(02)02530-3

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Calix[4]arenes containing urea and crown/urea moieties, 7 and 10, respectively have been synthesized. H-1 NMR titrations of 7 and 10 with anions in DMSO-d(6) showed that 7 and 10 formed complexes with Cl-, Br-, NO3- and H2PO4- to a different extent. The association constants of 7 and 10 towards anions were calculated and found to vary as H2PO4->Cl->Br-> NO3-. However, compared to 7 the presence of the crown unit in 10 resulted in a slightly higher affinity to Cl- and Br-, but a lower affinity to H2PO4-. Upon addition of Na+, the binding ability of 10 towards H2PO4- is increased due to ion-pair enhancement. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：29 / 32

页数：4

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