A biscalix[4]arene-based ditopic hard/soft receptor for K+/Ag+ complexation

被引：41
作者：
Budka, J
Lhoták, P
Stibor, I
Michlová, V
Sykora, J
Cisarová, I
机构：
[1] Inst Chem Technol, Dept Organ Chem, Prague 16628 6, Czech Republic
[2] Inst Chem Technol, Dept Solid State Chem, Prague 16628 6, Czech Republic
[3] Charles Univ, Dept Inorgan Chem, Prague 12843 2, Czech Republic
来源：
TETRAHEDRON LETTERS | 2002年 / 43卷 / 15期
关键词：
D O I：
10.1016/S0040-4039(02)00343-X
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
A biscalixarene bearing tert-butylated and de-tert-butylated calix[4]arene unit connected by four ethylenox bridges has been prepared. This compound adopts the pinched cone conformation (C-2v symmetry) and hence. is suitable preorganised for Ag- complexation. X-ray crystallography showed that the silver cation (soft) is sandwiched by the two distal coplanar phenyl rings of the de-tert-butylated part of the molecule possessing a eta(1) binding mode. The complexatio'n of the K+ cation (hard) into the central cavity created by the bridging moieties leads to a change of conformation (C-4v symmetry) and hence. to the complete loss of complexation ability towards the Ag+ cation. (C) 2002 Elsevier Science Ltd. All rights reserved.
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页码：2857 / 2861
页数：5
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