NMR and DFT study on media effects on proton transfer in hydrogen bonding: concept of molecular probe with an application to ionic and super-polar liquids

Literature Information

Publication Date 2009-07-27
DOI 10.1039/B819666D
Impact Factor 3.676
Authors

Vytautas Balevicius, Zofia Gdaniec, Kestutis Aidas


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Abstract

Media effects of ionic and super-polar liquids on the state of H-bonding were studied by NMR and DFT methods. The proton sharing (positioning) in the H-bond was monitored following the chemical shifts of picolinic acid N-oxide (PANO) used as the molecular probe. The relationships between PANO1H and 13C chemical shifts and proton position in the O–H⋯O bridge were calibrated using traditional organic solvents and other H-bond complexes of pyridine N-oxide with acids to increase the H-bond strength. A reliable parameter for H-bond monitoring was proposed. The state of the H-bond in ionic liquid media is largely governed by the dielectric properties of the bulk media. A drastic fall-out of PANO/[BuMePyr][TfO] from the general dielectric scheme built using solvents with increasing dielectric constant (from chloroform to water and culminating with formamide) was observed. On a molecular level this effect indicates that the ionic liquid [BuMePyr][TfO] can act on H-bonded systems as a stimulant of proton transfer. In ‘super-polar’ media (formamide) the intramolecular H-bond system converts into an intermolecular one forming a neutral H-bond complex of PANO with the formamide molecule.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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