Abstract
A series of 5-dialkyl(aryl)aminomethyl-8-hydroxyquinoline dansylates were synthesized and their fluoroionophoric properties toward representative alkali ions, alkaline earth ions and transition metal ions were investigated. Among the selected ions, Fe3+ caused considerable quenching of the fluorescence, while Cr3+ caused quenching to some extent. The absence of any significant fluorescence quenching effects of the other ions examined, especially Fe2+, renders these compounds highly useful Fe3+-selective fluorescent sensors.
Highlights
A variety of metal ions are known to play vital roles in the structural, catalytic and regulatory aspects of biological systems [1a], sensitive and selective detection of these metal ions is of great importance
The residual 8-hydroxyquinoline was not removed completely by washing with acetone and a substitution reaction occurred during the crystallization in ethanol
The final products, 4a-4d, were prepared by reaction of 3a-3d with dansyl chloride in tetrahydrofuran in good yield. 4e was prepared by direct dansylation of 1
Summary
A variety of metal ions are known to play vital roles in the structural, catalytic and regulatory aspects of biological systems [1a], sensitive and selective detection of these metal ions is of great importance. Regarding the Fe3+ sensors reported up to date (Figure 1), their detection of Fe3+ is always accompanied by interference from Cu2+ and Cr3+, which affects their selectivity. Another naphthalene-derived fluorescent sensor showed a Fe3+:Cr3+ fluorescence-quenching ratio of 1:0.83 [2a]. A calix[4]arene-derived fluorescent sensor could selectively detect Fe3+ and Cu2+ [5b] with a Fe3+:Cu2+
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
