Hydration, ion pairing, and sandwich motifs in ammonium nitrate complexes of crown ethers

被引：37

作者：

Doxsee, KM ^{[1
]}

Francis, PE ^{[1
]}

Weakley, TJR ^{[1
]}

机构：

[1] Univ Oregon, Dept Chem, Eugene, OR 97403 USA

来源：

TETRAHEDRON | 2000年 / 56卷 / 36期

关键词：

ammonium nitrate complexes; crown ethers; ion pairing;

D O I：

10.1016/S0040-4020(00)00487-7

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Ammonium nitrate coordinates to 18-crown-6 through a near-ideal 'tripod' arrangement of hydrogen bonds to alternate crown ether oxygen atoms. Ion pairing interactions are apparent, with the strength of this ion pairing interaction appearing to be reduced by hydration, representing a potentially significant role of water in cation-molecule complexes. The bis(benzo-15-crown-5) complex of ammonium nitrate is of sandwich type structure, with thr ammonium ion complexed between two roughly parallel crown ether rings through an unusual but efficient set of linear, bifurcated, and off-axis hydrogen bonding interactions. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：6683 / 6691

页数：9

共 45 条

[1] SIR92 - a program for automatic solution of crystal structures by direct methods [J].