Multi-addressable fluorescence switch based on a new photochromic diarylethene with two rhodamine B units

Novel Diarylethene-Based Fluorescent Switching for the Detection of Al3+ and Construction of Logic Circuit

A novel photochromic diarylethene was synthesized successfully containing a phthalazine unit. Its multistate fluorescence switching properties were investigated by stimulating with UV/vis lights and Al3+/EDTA. The synthesized diarylethene displayed excellent selectivity to Al3+ with a distinct fluorescence change, revealing that it could be used as a sensor for fluorescence identification of Al3+, and a logic circuit was constructed by utilizing this diarylethene molecular platform. Moreover, it also exhibited a high accuracy for the determination of Al3+ in practical water samples.

A novel fluorescence "turn-on" sensor based on a photochromic diarylethene for the selective detection of Al(III)

A novel photochromic diarylethene with a triazole-containing 2-(2'-phenoxymethyl)-benzothiazole group has been synthesized via "click" reaction. The diarylethene exhibited good photochromism and photoswitchable fluorescence. Its fluorescence emission intensity was enhanced 7-fold by acids, accompanied by the red-shift of emission peak from 526nm to 566nm and the concomitant color change from dark to bright flavogreen. The diarylethene selectively formed a 1:1 metal complex with Al³⁺, resulting in a "turn-on" fluorescence signal. The complexation - reaction between Al³⁺ and the diarylethene is reversible with the binding constant of 2.73×10³Lmol^-1. The limit of detection (LOD) of Al³⁺ was determined to be 5.94×10^-8molL^-1. Based on this unimolecular platform, a logic circuit was fabricated using the fluorescence emission intensity at 572nm as the output and the combined stimuli of Al³⁺/EDTA and UV/Vis as the inputs.