Metal-ion detection by the magnetic-field-sensitive fluorescence of intramolecular exciplexes containing aza-crown-ether moieties as electron donor

被引：12

作者：

Petrov, NK ^{[1
]}

Kuhnle, W ^{[1
]}

Fiebig, T ^{[1
]}

Staerk, H ^{[1
]}

机构：

[1] MAX PLANCK INST BIOPHYS CHEM,ABT SPEKTROSKOPIE & PHOTOCHEM KINET,D-37077 GOTTINGEN,GERMANY

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 1997年 / 101卷 / 38期

关键词：

D O I：

10.1021/jp971426b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Magnetic field effects (MFE) detected by intramolecular exciplex fluorescence have been studied in acetonitrile solutions for new donor-acceptor compounds in which pyrene is Linked to aza-15-crown ether by a polymethylene chain with 3, 9, and 16 CH2 units. It was found that addition of alkali and alkaline-earth ions to the solutions decreases the observable MFE. The longer the chain and the greater the stability constants of the aza-crown complexes with metal ions, the more pronounced is the influence of the added metal ions. The data obtained are rationalized on the basis of a kinetic scheme that specifically includes photoejection of metal ions from the crown-ether complexes, accompanied by Coulombic interaction of the ions released with the solvent-separated radical ion pairs, the so-called special salt effect.

引用

页码：7043 / 7046

页数：4

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