Solvent-Triggered Long-Range Proton Transport in 7-Hydroxyquinoline Using a Sulfonamide Transporter Group

The ability of long-range proton transport by substitution of 7-hydroxyquinoline at the eighth position with sulfonamide and sulfonylhydrazone rotor units to act as a crane-arm has been studied. Different proton transport pathways triggered by different stimuli have been established depending on the structure of the crane-arms. Solvent-driven proton switching from OH to the quinoline nitrogen […]

Benzothiazol picolin/isonicotinamides molecular switches: Expectations and reality

The ground state tautomerism and excited state intramolecular proton transfer in two new molecular switches, namely N-(benzo[d]thiazol-2-yl)picolinamide and N-(benzo[d]thiazol-2-yl)isonicotinamide, are studied in acetonitrile by the combined use of steady state and time dependent spectroscopy and DFT calculations. Although, according to the theoretical calculations, two potential switching pathways are possible in N-(benzo[d]thiazol-2-yl)picolinamide, either through the pyridine […]

Acid Dissociation Constants of the Benzimidazole Unit in the Polybenzimidazole Chain: Configuration Effects

The acid dissociation constant of three benzimidazoles, namely 2,2′-bibenzo[d]imidazole, 2,5′-bibenzo[d]imidazole, and 5,5′-bibenzo[d]imidazole, have been investigated by means of density functional theory calculations in gas phase and in aqueous solution. The theoretical approach was validated by the comparing of predicted and experimentally determined pKa values in imidazole, benzimidazole, and 2-phenylbenzimidazole. From the studied compounds, 2,2′-bibenzo[d]imidazole was […]

Eureka Foundation Prize for Young Researcher of 2021 awarded to Dr Silvia Hristova

We are very proud to announce that Dr Silvia Hristova, who defended her PhD thesis in our group in 2020, was awarded by The Eureka Foundation as young scientist with substantial contribution in the science. The thesis of Silvia considers the possibility of using controlled proton transfer as an elementary process in the molecular machinery. […]

Among the best 2% of the scientists

The new “Updated science-wide author databases of standardized citation indicators” has been released. It represents a database of over 100,000 top-scientists and provides standardized information on citations, h-index, co-authorship adjusted hm-index, citations to papers in different authorship positions and a composite indicator. Separate data are shown for career-long and single year impact. Scientists are classified […]

Union of Scientists in Bulgaria Grand Prize for PhD thesis awarded to Dr Silvia Hristova

We are proud to announce that Dr Silvia Hristova, who defended her PhD thesis in our group last year, was awarded by The Union of Scientists in Bulgaria for best PhD thesis in 2020. The thesis of Silvia considers the possibility of using controlled proton transfer as an elementary process in the molecular machinery. The […]

Chemistry Europe Fellowship awarded to Professor Katharina M. Fromm

We warmly congratulate Professor Katharina M. Fromm (University of Fribourg), collaboration partner over many years, on her Chemistry Europe award. The Chemistry Europe Fellows Program was established in 2015 (as the ChemPubSoc Europe Fellows Program). For the period 2018/2019, 37 European chemists were recognized for their outstanding support as authors, advisors, guest editors, referees as […]

First international scientific conference on “Medicinal, aromatic and edible plants and by-products in their processing (MAEP & WASTE): Use and utilization for a sustainable and circular economy”

The first international scientific conference on “Medicinal, aromatic and edible plants and by-products in their processing (MAEP & WASTE): Use and utilization for a sustainable and circular economy” was held on 09.09.2021 in Plovdiv, Bulgaria. The main topics covered were the numerous opportunities for the application of biologically active substances from essential oil crops, such […]

7-OH quinoline Schiff bases: are they the long awaited tautomeric bistable switches?

Two novel, 7-hydroxyquinoline based, Schiff bases have been synthesized and their spectral properties have been investigated by combined use of optical and NMR spectroscopy and theoretical DFT calculations. The results indicate that 8-((phenylimino)methyl)quinolin-7-ol exists as a mixture of enol and two keto tautomers in solution, while 8-(((pentarfluorophenyl)imino)methyl)quinolin-7-ol is presented as a single enol form. Upon […]

Subcritical Extracts from Major Species of Oil-Bearing Roses – A Comparative Chemical Profiling

A comprehensive chemical profiling of 1,1,1,2-tetrafluoroethane (freon R134a) subcritical extracts from the main genotypes of oil-bearing roses, was performed by gas chromatography–mass spectrometry (GC/MS) and gas chromatography with flame ionization detection (GC-FID) in order to reveal the differences in their chemical composition. One hundred and three individual compounds were identified using GC/MS and their quantitative […]

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