ArticleACS omega2020
Anomalous Optical Properties of Citrazinic Acid under Extreme pH Conditions.
Article in ACS omega, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Insights into tautomerism and pH effects on the photoluminescence of citric acid-derived molecular fluorophores.RSC advances · 2026Article
- Green synthesis and multi-Gaussian analysis of carbon quantum dots from orange peels: optical properties, phonon interactions, and Huang-Rhys factor characterization.Scientific reports · 2025Article
- Carbon Nanodots from an In Silico Perspective.Chemical reviews · 2022Review
- Harnessing Molecular Fluorophores in the Carbon Dots Matrix: The Case of Safranin O.Nanomaterials (Basel, Switzerland) · 2022Article
- Formation of Citrazinic Acid Ions and Their Contribution to Optical and Magnetic Features of Carbon Nanodots: A Combined Experimental and Computational Approach.Materials (Basel, Switzerland) · 2021Article
- Reversible Aggregation of Molecular-Like Fluorophores Driven by Extreme pH in Carbon Dots.Materials (Basel, Switzerland) · 2020Article
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Authors and funding
8 authors.
Funding
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Abstract
Citrazinic acid (CZA) is a weakly fluorescent molecular compound whose optical properties are dependent on aggregation states and chemical environment. This molecule and its derivatives have been recently identified as the source of the intense blue emission of carbon dots obtained from citric acid with a nitrogen source, such as ammonia or urea. Citrazinic acid has a strong tendency to aggregate and form tautomers whose optical properties are largely unexplored. At extreme acidic and basic pH values, we have observed an "anomalous" optical response of citrazinic acid, attributed to the formation of aggregates from the tautomers. We have characterized the molecule, both at pH = 1 and 14, using UV-vis, NMR, steady-state, and time-resolved fluorescence spectroscopy. At extremely low pH values, the protonation causes luminescence quenching and the appearance of new emissions. On the contrary, high pH values are responsible for deprotonation and splitting of the excitation spectra.
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Registered trials
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