Attachment of an electron-withdrawing fluorophore to a cryptand for modulation of fluorescence signaling

被引：47

作者：

Bag, B ^{[1
]}

Bharadwaj, PK ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Chem, Kanpur 208016, Uttar Pradesh, India

来源：

INORGANIC CHEMISTRY | 2004年 / 43卷 / 15期

关键词：

D O I：

10.1021/ic049725k

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The laterally nonsymmetric aza cryptand synthesized by condensing tris(2-aminoethyl)amine (tren) with tris{2-[(3(oxomethyl)phenyl)oxy]ethyl}amine readily forms mononuclear inclusion complexes with both transition- and main-group-metal ions. The fluorophore 7-nitrobenz-2-oxa-1,3-diazole is attached to one of the secondary amines, to give an integrated fluorophore-receptor configuration. The fluorophoric system does not show any appreciable emission when excited due to an efficient photoinduced intramolecular electron transfer (PET) from the nitrogen lone pair. When a metal ion enters the cavity, the PET is blocked, causing recovery of fluorescence; Cd(II) gives the highest quantum yield. The fluorophore, with T-accepting ability, drastically alters the binding property of the cryptand. With perchlorate or tetrafluoroborate salts of Cd(II), the metal ion enters the cavity, causing recovery of fluorescence. However, in the presence of coordinating ions such as Cl-, N-3(-), and SCN-, the metal ion comes out of the cavity, causing PET to take place once again, and the fluorescence is lost. Thus, translocation of Cd(II) between the inside and outside of the cryptand cavity can lead to a reversible fluorescence on/off situation.

引用

页码：4626 / 4630

页数：5

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