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Bifunctional Cu²⁺/Fe³⁺ Probe with Independent Signal Outputs Based on a Photochromic Diarylethene with a Dansylhydrazine Unit.

ABSTRACT: A novel dual-response fluorescent sensor based on a diarylethene photoswitching unit and a dansylhydrazine functional group has been synthesized. The compound exhibited high selectivity for Fe³⁺ and Cu²⁺ with independent fluorescence signal outputs. In the presence of Fe³⁺, the sensor formed a 1:1 metal complex, resulting in a remarkable "turn-off" fluorescence signal. On the other hand, its fluorescence intensity was notably enhanced (turn-on) and a color change from bright yellow to bright blue was observed when the sensor interacted with Cu²⁺, which was due to the hydrolysis reaction of the dansyl acid dye, as confirmed by high-resolution mass spectrometry-electrospray ionization and infrared spectrum. The detection limits were 9.73 × 10^-8 mol L^-1 for Fe³⁺ and 3.49 × 10^-7 mol L^-1 for Cu²⁺, respectively. From the unimolecular platform, two molecular logic circuits were constructed using the fluorescence emission intensity at 557/494 nm (Fe³⁺/Cu²⁺) as the outputs and the combined stimuli of Fe³⁺/ethylenediaminetetraacetic acid, Cu²⁺, and UV/vis as the inputs. In addition, the sensor was successfully used to determine Fe³⁺ in water samples from Ganjiang River and soil samples from Nanchang fields.

SUBMITTER: Liang Y

PROVIDER: S-EPMC6647968 | biostudies-literature |

REPOSITORIES: biostudies-literature

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