Design and synthesis of a squaraine based near-infrared fluorescent probe for the ratiometric detection of Zn2+ ions

A squaraine based ratiometric near-infrared fluorescent probe with bipyridyl binding arms for Zn2+ (SQ-1) has been designed and synthesized. SQ-1 exhibits a selective fluorogenic response to Zn2+ in acetone by a 22 nm red-shift and a remarkable enhancement of the fluorescence intensity. Further stud...

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Bibliographic Details
Published in:Dyes and pigments 2013-12, Vol.99 (3), p.699-704
Main Authors: Huang, Yangwei, Lin, Qian, Wu, Jiaming, Fu, Nanyan
Format: Article
Language:English
Subjects:
Acetone
Binding
Bipyridyl ionophore
Dyes
Fluorescence
Fluorescent sensor
Mathematical analysis
Near-infrared functional dye
Pigments
Ratiometric detection
Squaraine
Synthesis
Zinc ion
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Summary:A squaraine based ratiometric near-infrared fluorescent probe with bipyridyl binding arms for Zn2+ (SQ-1) has been designed and synthesized. SQ-1 exhibits a selective fluorogenic response to Zn2+ in acetone by a 22 nm red-shift and a remarkable enhancement of the fluorescence intensity. Further study shows that the calculated detection limit for Zn2+ is 6.1 × 10−8 M (3σ/k) and the identification for Zn2+ will not be impacted by competing ions such as Na+, K+, Mg2+, Ca2+, Pb2+, Mn2+, Ba2+ and Hg2+. The binding mode between SQ-1 and Zn2+ has also been discussed. [Display omitted] •A novel ratiometric near-infrared fluorescent probe (SQ-1) for Zn2+ has been first synthesized based on squaraine dye.•SQ-1 can detect Zn2+ in acetone by a 22 nm red-shift and a remarkable enhancement of the fluorescence intensity.•The detection identification for Zn2+ will not be impacted by the biologically ubiquitous ions such as Na+, K+, Mg2+ and Ca2+.
ISSN:0143-7208
1873-3743
DOI:10.1016/j.dyepig.2013.06.020