Tandem Visual Recognition of Cu<sup>2+</sup> and Chiral Tartaric Acid by Sequence Gel Formation and Collapse
A chiral gelator (<i>R</i>)-H<sub>6</sub>L with multiple carboxyl groups based on a 1,1′-bi-2,2′-naphthol (BINOL) skeleton was prepared, and it could form a supramolecular gel under the induction of water in DMSO/H<sub>2</sub>O and DMF/H<sub>2</sub>O (...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
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| Series: | Gels |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2310-2861/11/5/340 |
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| Summary: | A chiral gelator (<i>R</i>)-H<sub>6</sub>L with multiple carboxyl groups based on a 1,1′-bi-2,2′-naphthol (BINOL) skeleton was prepared, and it could form a supramolecular gel under the induction of water in DMSO/H<sub>2</sub>O and DMF/H<sub>2</sub>O (1/1, <i>v</i>/<i>v</i>). In the EtOH/H<sub>2</sub>O system, the original partial gel transformed into a stable metal–organic gel (MOG), specifically with Cu<sup>2+</sup> among 20 metal ions. It is proposed that Cu<sup>2+</sup> coordinates with the carboxyl groups of (<i>R</i>)-H<sub>6</sub>L to form a three-dimensional network structure. With the addition of a variety of α-hydroxy acids and amino acids, the Cu<sup>2+</sup>-MOG collapsed with merely 0.06 equivalents of L-tartaric acid (L-TA), while other acids required much larger amounts to achieve the same effect, realizing the visual chemoselective and enantioselective recognition of tartaric acid. Therefore, the chiral gelator (<i>R</i>)-H<sub>6</sub>L achieved the tandem visual recognition of Cu<sup>2+</sup> and chiral tartaric acid by sequence gel formation and collapse, offering valuable insights for visual sensing applications and serving as a promising model for future chiral sensor design. |
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| ISSN: | 2310-2861 |