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Issue 6, 2019
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A 1,8-naphthalimide–pyridoxal conjugate as a supramolecular gelator for colorimetric read out of F ions in solution, gel and solid states

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Abstract

A naphthalimide–pyridoxal conjugate 1 has been designed and synthesized. Compound 1 forms a stable greenish yellow colored gel in DMSO : H2O (8 : 1 v/v). Rheological study reveals that the gel is mechanically strong (G′> G′′) over a wide range of applied strains. The morphology of the gel as determined by FESEM shows a highly cross-linked fibrous network. The gel is anion-responsive and is selectively transformed into a sol with a color change from greenish yellow to deep blue only in the presence of F among other anions. In CH3CN, compound 1 was also sensitive to basic anions such as F and AcO ions. In solution, F was differentiated from AcO through a color change. While the yellow colored solution of 1 in acetonitrile was changed into deep blue in the presence of F, AcO ions gave a faint blue coloration. A similar colorimetric differentiation of F from AcO has been possible in CH3CN by a reusable Schiff base-linked Merrifield resin 1a or 1b.

Graphical abstract: A 1,8-naphthalimide–pyridoxal conjugate as a supramolecular gelator for colorimetric read out of F− ions in solution, gel and solid states

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Publication details

The article was received on 06 Nov 2018, accepted on 08 Jan 2019 and first published on 08 Jan 2019


Article type: Paper
DOI: 10.1039/C8NJ05626A
Citation: New J. Chem., 2019,43, 2718-2725

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    A 1,8-naphthalimide–pyridoxal conjugate as a supramolecular gelator for colorimetric read out of F ions in solution, gel and solid states

    C. Pati and K. Ghosh, New J. Chem., 2019, 43, 2718
    DOI: 10.1039/C8NJ05626A

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