Photoresponsive tweezers for alkali metal ions. Photochromic diarylethenes having two crown ether moieties

被引：98
|
作者：
Takeshita, M [1 ]
Irie, M [1 ]
机构：
[1] Kyushu Univ, Grad Sch Engn, Dept Biochem & Chem, Higashi Ku, Fukuoka 8128581, Japan
来源：
JOURNAL OF ORGANIC CHEMISTRY | 1998年 / 63卷 / 19期
关键词：
D O I：
10.1021/jo980290q
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
Alkali metal ion extraction was carried out using photochromic dithienylethene having two benzo-12-crown-4 ethers (1), benzo-15-crown-5 ethers (2), or benzo-18-crown-6 ethers moieties (3) and bis(benzothienyl)ethene having two benzo-18-crown-6 ether moieties (4). Two crown ether moieties of the open-ring form captured large metal ions cooperatively like tweezers, while the photogenerated closed-ring form released the ions. The reduced affinities for metal picrates were fully recovered by irradiation with visible light (>480 nm). The H-1 NMR spectrum measurement of the solutions (CDCl3/CD3CN: 5/1) containing both alkali metal picrates and 2 or 3 confirmed that the large alkali metal ions were captured by the two intramolecular crown ethers,
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收藏
页码：6643 / 6649
页数：7
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