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  Eutectic media open a synthetic route to oligocitrazinic acid fluorophores of purple hue

Schneider, H., Strauß, V., Vogl, S., Antonietti, M., & Filonenko, S. (2023). Eutectic media open a synthetic route to oligocitrazinic acid fluorophores of purple hue. ChemPhysChem, 24(17): e202300180. doi:10.1002/cphc.202300180.

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 Creators:
Schneider, Helen1, Author           
Strauß, Volker2, Author           
Vogl, Sarah, Author
Antonietti, Markus3, Author                 
Filonenko, Svitlana1, Author                 
Affiliations:
1Svitlana Filonenko, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3158261              
2Volker Strauß, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3025555              
3Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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Free keywords: Reactive eutectic media; citric acid; cítrazinic acid; dyes; carbon dots
 Abstract: Under isochoric and solvent-free conditions, the reaction between ammonium formate and citric acid results in a deeply purple reaction product with fluorescent properties. This brings this reaction in the realm of bio-based fluorophores and bottom-up carbon nanodots from citric acid. The reaction conditions are optimized in terms of UV-vis spectroscopic properties and, subsequently, the main reaction product is separated. While the structural analysis does not give any indication for carbon nanodots in a general sense, it points towards the formation of molecular fluorophores that consist of oligomerized citrazinic acid derivatives. Furthermore, EPR spectroscopy reveals the presence of stable free radicals in the product. We hypothesize that such open-shell structures may play a general role in molecular fluorophores from citric acid and are not yet sufficiently explored. Therefore, we believe that analysis of these newly discovered fluorophores may contribute to a better understanding of the properties of fluorophores and CND from citric acid in general.

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Language(s): eng - English
 Dates: 2023-06-262023
 Publication Status: Issued
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 Identifiers: DOI: 10.1002/cphc.202300180
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Title: ChemPhysChem
Source Genre: Journal
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Publ. Info: Weinheim, Germany : Wiley-VCH
Pages: - Volume / Issue: 24 (17) Sequence Number: e202300180 Start / End Page: - Identifier: ISSN: 1439-4235