Fluorescent “OFF–ON” Sensors for the Detection of Sn<sup>2+</sup> Ions Based on Amine-Functionalized Rhodamine 6G
These structurally isomeric rhodamine 6G-based amino derivatives are designed to detect Sn<sup>2+</sup> ions. The receptors exhibit rapid fluorescent “turn-on” responses towards Sn<sup>2+</sup>. The absorption (530 nm) and fluorescent intensity (551 nm) of the receptors incre...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-02-01
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| Series: | Chemosensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2227-9040/10/2/69 |
| Summary: | These structurally isomeric rhodamine 6G-based amino derivatives are designed to detect Sn<sup>2+</sup> ions. The receptors exhibit rapid fluorescent “turn-on” responses towards Sn<sup>2+</sup>. The absorption (530 nm) and fluorescent intensity (551 nm) of the receptors increase when increasing the concentration of Sn<sup>2+</sup>. The hydrazine derivative exhibits more rapid sensitivity towards Sn<sup>2+</sup> than the ethylene diamine derivative, indicating that the presence of an alkyl chain in the diamine decreases the sensitivity of the receptors towards Sn<sup>2+</sup>. The presence of carbonyl groups and terminal amino groups strongly influences the sensitivity of the chemosensors toward Sn<sup>2+</sup> by a spirolactam ring-opening mechanism. The receptors exhibit 1:1 complexation with Sn<sup>2+</sup> as evidenced by Job plot, and the corresponding limit of detection was found to be 1.62 × 10<sup>−7</sup> M. The fluorescence images of the receptors and their complexes reveal their potential applications for imaging of Sn<sup>2+</sup> in real/online samples. |
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| ISSN: | 2227-9040 |