scholarly journals Kernresonanz-Emissionslinien während rascher Radikalreaktionen

1967 ◽  
Vol 22 (10) ◽  
pp. 1556-1562 ◽  
Author(s):  
J. Bargon ◽  
H. Fischer
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Emission Lines ◽  
Radical Reactions ◽  
Dynamic Coupling ◽  
Correct Order ◽  
Chemically Induced ◽  
Resonance Emission ◽  
Order Of Magnitude

Previously observed nuclear magnetic resonance emission lines of products of rapid radical reactions are explained by chemically induced dynamic nuclear polarization. This polarization occurs after the production of radicals by the dynamic coupling between radical electrons and protons, and it is transfered to the products by the secondary reaction. A theoretical analysis shows that this concept leads to a correct order of magnitude calculation of the intensity of emission. New experiments are described the results of which support the explanation. It is concluded that chemically induced dynamic nuclear polarization is not restricted to the systems treated so far but may occur in other investigations also.

scholarly journals Pushing nuclear magnetic resonance sensitivity limits with microfluidics and photo-chemically induced dynamic nuclear polarization

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Miguel Mompeán ◽  
Rosa M. Sánchez-Donoso ◽  
Antonio de la Hoz ◽  
Vittorio Saggiomo ◽  
Aldrik H. Velders ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Chemically Induced ◽  
Nuclear Magnetic

scholarly journals Synthesis of nucleotide–amino acid conjugates designed for photo-CIDNP experiments by a phosphotriester approach

2013 ◽  
Vol 9 ◽  
pp. 2898-2909 ◽  
Author(s):  
Tatyana V Abramova ◽  
Olga B Morozova ◽  
Vladimir N Silnikov ◽  
Alexandra V Yurkovskaya
Keyword(s):  
Amino Acid ◽  
Liquid Phase ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Radical Reactions ◽  
Oligonucleotide Synthesis ◽  
High Quality ◽  
Phase Synthesis ◽  
Amino Acid Conjugates ◽  
Chemically Induced

Conjugates of 2’-deoxyguanosine, L-tryptophan and benzophenone designed to study pathways of fast radical reactions by the photo Chemically Induced Dynamic Nuclear Polarization (photo-CIDNP) method were obtained by the phosphotriester block liquid phase synthesis. The phosphotriester approach to the oligonucleotide synthesis was shown to be a versatile and economic strategy for preparing the required amount of high quality samples of nucleotide–amino acid conjugates.

Chemisch induzierte Kernpolarisation von Phenylhalogeniden bei der Photolyse von Aroylperoxiden

1969 ◽  
Vol 24 (11) ◽  
pp. 1771-1778 ◽  
Author(s):  
M. Lehnig ◽  
H. Fischer
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Dynamic Nuclear Polarization ◽  
Nmr Spectra ◽  
Magnetic Field Dependence ◽  
Nuclear Polarization ◽  
Radical Reactions ◽  
Chemically Induced ◽  
Polarization Mechanism ◽  
The Magnetic Field

Abstract By a flow technique chemically induced nuclear polarization is observed in the NMR-spectra of phenylhalides formed during photolysis of aroylperoxides in solution. The main features of the polarization are quantitatively explained by dynamic nuclear polarization (CIDNP) of protons in the intermediate phenyl radicals. Some details however indicate that a second polarization mechanism is also present. This mechanism leads to a multiplet-effect type polarization and operates presumably during bond fromation in the radical reactions. Some results on the magnetic field dependence of the nuclear polarizations are given.

Chemisch induzierte dynamische Kernpolarisation bei einigen Radikalreaktionen

1968 ◽  
Vol 23 (12) ◽  
pp. 2109-2120 ◽  
Author(s):  
J. Bargon ◽  
H. Fischer
Keyword(s):  
Nmr Spectra ◽  
Nuclear Polarization ◽  
Theoretical Treatment ◽  
Methyl Radicals ◽  
Correct Order ◽  
Fluorine Nmr ◽  
Alkyl Radicals ◽  
Enhanced Absorption ◽  
Chemically Induced ◽  
Order Of Magnitude

Emission and enhanced absorption in proton NMR spectra during reactions of phenyl, methyl and other alkyl radicals in solutions are described. For the phenyl and methyl radicals the effects are explained in the correct order of magnitude by a theoretical treatment of the chemically induced dynamic nuclear polarization (CIDNP) given previously. This treatment however does not explain the CIDNP during reactions of alkyl radicals, where emission and absorption occur simultaneously in the NMR multipletts. CIDNP is also observed in fluorine NMR spectra during reactions of fluorine containing radicals.

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