Výsledky vyhledávání - "Benjamin Koeppe"

Combined NMR and UV–Vis Spectroscopic Studies of Models for the Hydrogen Bond System in the Active Site of Photoactive Yellow Protein: H-Bond Cooperativity and Medium Effects

Autor: Gleb S. Denisov, Hans-Heinrich Limbach, Jing Guo, Peter M. Tolstoy, Benjamin Koeppe

Publikováno v: The Journal of Physical Chemistry B. 125:5874-5884

Intramolecular hydrogen bonds in aprotic media were studied by combined (simultaneous) NMR and UV-vis spectroscopy. The species under investigation were anionic and featured single or coupled H-bonds between, for example, carboxylic groups and phenol

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6460175a86437940b2c7f235b62a5019
https://doi.org/10.1021/acs.jpcb.0c09923

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An efficient Perkin synthesis of 13 C-labelled cinnamic acids from acetic acid as the source of the rare isotope

Autor: Dominik Lenz, Benjamin Koeppe, Peter M. Tolstoy, Hans-Heinrich Limbach

Publikováno v: Journal of Labelled Compounds and Radiopharmaceuticals. 62:298-300

A variation of the Perkin reaction using a nonenolizable anhydride as the condensation agent allows for the effective conversion of valuable carboxylic acids to the corresponding cinnamates.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b0e0080e2ebb7174ded1ecd385b59f15
https://doi.org/10.1002/jlcr.3753

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Polar solvent fluctuations drive proton transfer in hydrogen bonded complexes of carboxylic acid with pyridines: NMR, IR and ab initio MD study

Autor: Erik T. J. Nibbering, Benjamin Koeppe, Svetlana Pylaeva, Gleb S. Denisov, Christoph Allolio, Hans-Heinrich Limbach, Peter M. Tolstoy, Daniel Sebastiani

Publikováno v: Physical Chemistry Chemical Physics. 19:1010-1028

We study a series of intermolecular hydrogen-bonded 1 : 1 complexes formed by chloroacetic acid with 19 substituted pyridines and one aliphatic amine dissolved in CD2Cl2 at low temperature by 1H and 13C NMR and FTIR spectroscopy. The hydrogen bond ge

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e12220825b0c2db331d48efc9f9207fa
https://doi.org/10.1039/c6cp06677a

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Reversible Spatial Control in Aqueous Media by Visible Light: A Thioindigo Photoswitch that is Soluble and Operates Efficiently in Water

Autor: Benjamin Koeppe, Florian Römpp

Publikováno v: Chemistry (Weinheim an der Bergstrasse, Germany). 24(54)

Aiming to extend the scope of indigoid photoswitches to polar protic environments, we have synthesized a sulfonated thioindigo derivative highly soluble in water. Studies by UV/Vis absorption, fluorescence, and NMR spectroscopy indicate that, despite

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fbcd830aae1aacd1e203be7e4c2e121a
https://pubmed.ncbi.nlm.nih.gov/30058151

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NMR and FT-IR Studies on the Association of Derivatives of Thymidine, Adenosine, and 6-N-Methyl-Adenosine in Aprotic Solvents

Autor: Peter M. Tolstoy, Erik T. J. Nibbering, Benjamin Koeppe

Publikováno v: Zeitschrift für Physikalische Chemie. 227:723-749

Associates of 3',5'-O-TBDMS protected derivatives of the 2'-deoxy forms of the nucleosides adenosine, 6-N-methyl-adenosine and thymidine (henceforward simply addressed by their parents' names) and further model systems in dichloromethane and Freon (C

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6f32f862c855bda8ce6416ff03ab95c6
https://doi.org/10.1524/zpch.2013.0388

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N–H Stretching Modes of Adenosine Monomer in Solution Studied by Ultrafast Nonlinear Infrared Spectroscopy and Ab Initio Calculations

Autor: Rene Costard, Henk Fidder, Nicholas K. Preketes, Thomas Elsaesser, Benjamin Koeppe, Christian Greve, Erik T. J. Nibbering, Friedrich Temps, Shaul Mukamel

Publikováno v: The Journal of Physical Chemistry A. 116:7636-7644

The N-H stretching vibrations of adenine, one of the building blocks of DNA, are studied by combining infrared absorption and nonlinear two-dimensional infrared spectroscopy with ab initio calculations. We determine diagonal and off-diagonal anharmon

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a5da3f24f3b1d5786fc233a4a1260f7
https://doi.org/10.1021/jp303864m

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NMR Study of Conformational Exchange and Double-Well Proton Potential in Intramolecular Hydrogen Bonds in Monoanions of Succinic Acid and Derivatives

Autor: Jing Guo, Benjamin Koeppe, Hans-Heinrich Limbach, Peter M. Tolstoy, Gleb S. Denisov

Publikováno v: The Journal of Physical Chemistry A. 115:9828-9836

We present a (1)H, (2)H, and (13)C NMR study of the monoanions of succinic (1), meso- and rac-dimethylsuccinic (2, 3), and methylsuccinic (4) acids (with tetraalkylammonium as the counterion) dissolved in CDF(3)/CDF(2)Cl at 300-120 K. In all four mon

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7ea2ad6f37af684f8534359a342fe4a
https://doi.org/10.1021/jp201073j

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Reaction Pathways of Proton Transfer in Hydrogen-Bonded Phenol–Carboxylate Complexes Explored by Combined UV–Vis and NMR Spectroscopy

Autor: Peter M. Tolstoy, Hans-Heinrich Limbach, Benjamin Koeppe

Publikováno v: Journal of the American Chemical Society. 133:7897-7908

Combined low-temperature NMR/UV-vis spectroscopy (UVNMR), where optical and NMR spectra are measured in the NMR spectrometer under the same conditions, has been set up and applied to the study of H-bonded anions A··H··X(-) (AH = 1-(13)C-2-chloro-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::89275ab45b03c479a5d7713b0d5f3f42
https://doi.org/10.1021/ja201113a

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