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An NMR insight into the solvatochromic behaviour of Brooker’s merocyanine dyes

26 May 2025, Version 2
Working Paper
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Systematic NMR/UV-Vis analysis of Brooker’s merocyanine dyes reveals solvent polarity governs electronic structure and spectroscopy. Absorption maxima and ¹⁵N NMR shifts correlate with ET(30), probing zwitterionic/ vinylogous amide. Substituent and solvent effects modulate these interactions, directly linking colour changes to electronic structure for rational design of environment-sensitive probes.

Keywords

Brooker's merocyanine
Nuclear magnetic resonance
ET(30)

Supplementary materials

Title
Description
Actions
Title
2025-05-20-ChemRxiv-ESI
Description
Detailed spectroscopic data; NMR and UV/Vis spectra data of the reported compounds.
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Version History

May 26, 2025 Version 2

Version Notes

Correction of Figure 1

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The content is available under CC BY NC ND 4.0 [opens in a new tab]

DOI

10.26434/chemrxiv-2025-qdj7z-v2
D O I: 10.26434/chemrxiv-2025-qdj7z-v2 [opens in a new tab]

Author’s competing interest statement

The author(s) have declared they have no conflict of interest with regard to this content

Ethics

The author(s) declare that they have sought and gained approval from the relevant ethics committee/IRB for this research and its publication.

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