Article ID Journal Published Year Pages File Type
742908 Sensors and Actuators B: Chemical 2014 5 Pages PDF
Abstract

Described here is a rhodamine-based derivative (1) that acts as a colorimetric and fluorescent “off-on” probe for the detection of pH. The design tactics for the probe is based on the change in structure between spirocyclic (non-fluorescent) and quinoid-type (fluorescent) forms of rhodamine dyes. The tetrahydrofuran/Tris(hydroxymethyl)aminomethane-HCl (4:6, v:v, pH 7.5) buffer solution of 1 is colorless and nonfluorescent, whereas ring-opening of the corresponding spirolactam to a conjugated quinoid form induced by H+ gives rise to strong absorption and fluorescence emission as well as a pink color. The fluorescence change of 1 is reversible and takes place mainly within the pH range from 1.1 to 4.0, which is valuable for the detection of strong acidic environment.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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