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Université de Fribourg

Tautomerism as primary signaling mechanism in metal sensing: the case of amide group

Deneva, Vera ; Dobrikov, Georgi ; Crochet, Aurélien ; Nedeltcheva, Daniela ; Fromm, Katharina M. ; Antonov, Liudmil

In: Beilstein Journal of Organic Chemistry, 2019, vol. 15, no. 1, p. 1898–1906

The concept for sensing systems using the tautomerism as elementary signaling process has been further developed by synthesizing a ligand containing 4- (phenyldiazenyl)naphthalene-1-ol as a tautomeric block and an amide group as metal capturing antenna. Although it has been expected that the intramolecular hydrogen bonding (between the tautomeric hydroxy group and the nitrogen atom from the...

Université de Fribourg

Isomerization and aggregation of 2-(2-(2-hydroxy-4-nitrophenyl)hydrazono)-1-phenylbutane-1,3-dione: Recent evidences from theory and experiment

Hristova, Silvia ; Kamounah, Fadhil S. ; Crochet, Aurélien ; Hansen, Poul Erik ; Fromm, Katharina M. ; Nedeltcheva, Daniela ; Antonov, Liudmil

In: Journal of Molecular Liquids, 2019, vol. 283, p. 242–248

The title compound potentially can exist as four isomers in solution. Recently Lycka has proposed a protocol for distinguishing two of them based on 15N NMR. This approach has been confirmed theoretically, in the current study, and further developed into a logical scheme that allows the existence of each of the isomers to be proven in solution. The experimental data, obtained by NMR and...

Consortium of Swiss Academic Libraries

Mark M. Wilde: Quantum information theory

Renes, Joseph

In: Quantum Information Processing, 2014, vol. 13, no. 2, p. 587-590

Université de Fribourg

A concept for stimulated proton transfer in 1-(phenyldiazenyl)naphthalen-2-ols

Hristova, S. ; Deneva, Vera V. ; Pittelkow, M. ; Crochet, Aurélien ; Kamounah, Fadhil S. ; Fromm, Katharina M. ; Hansen, P. E. ; Antonov, Liudmil

In: Dyes and Pigments, 2018, vol. 156, p. 91-99

A series of aryl azo derivatives of naphthols (1–3) were studied by means of UV–Vis and NMR spectroscopy in different solvents as well as by quantum chemical calculations and X-ray analysis. Previous studies have shown that Sudan I (1) exists as a tautomeric mixture. The effect of the solvents is minimized by the existing intramolecular hydrogen bond. Therefore, the influence on the...

Consortium of Swiss Academic Libraries

Mark S. Gordon

Baldridge, Kim ; Schmidt, Michael

In: Theoretical Chemistry Accounts, 2008, vol. 120, no. 1-3, p. 1-4