Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume 2021, Issue 37, Pages 3878-3885Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.202100580
Keywords
DFT; Fluorescence; Molecular recognition; Supramolecular chemistry; Urea
Categories
Funding
- MIUR (PRIN) [2017EKCS35]
- Universita degli Studi di Cagliari
- Fondazione di Sardegna
- CeSAR (Centro Servizi d'Ateneo per la Ricerca) of the University of Cagliari, Italy
- UK National Crystallography Service (NCS) at the University of Southampton
- Universita degli Studi di Cagliari within the CRUI-CARE Agreement
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The coordination and sensing properties of the novel fluorescent urea molecule L towards anions such as fluoride and metal ions like Zn2+ were investigated in solution and in the solid state. The results showed that L exhibited good affinity towards fluoride and could bind to Zn2+ in both solution and solid state, with enhanced fluorescence emission in the presence of the metal ion in MeCN.
The coordination and sensing properties towards anions and transition metal ions of the simple novel fluorescent urea 1-(2-aminophenyl)-3-(naphthalen-1)-yl)urea (L) were investigated in solution, and in the solid state. An electron donating amine group in the molecular skeleton of L decreased the acidity of the urea NHs that are usually deprotonated by basic anions and allowed for a good degree of affinity towards fluoride in DMSO-d(6)-0.5 %H2O. Moreover, the amine moiety acted as a further binding group for metal ions. Indeed, L was able to bind Zn2+ both in solution and in the solid state, and to respond to the presence of this metal ion in MeCN with an enhancement of the fluorescence emission. Although solution studies evidenced the formation of a 1 : 1 complex of L with Zn2+, complexes with a 2 : 1 ligand-to-metal stoichiometry were isolated in the solid state. DFT calculations helped to clarify the stability reasons behind these results.
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