Dynamic Nuclear Polarization in Highly Fluorinated Solutions

Dynamic Nuclear Polarization in Highly Fluorinated Solutions

The Overhauser effect type dynamic nuclear polarization experiments were performed to study solutions of the stable free radical α,γ-Bisdiphenylene-β-phenyl allyl complex with benzene (1:1) in some highly fluorinated aliphatic and aromatic solvents. In solutions examined in this study, it occurs mai...

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Bibliographic Details
Published in:Journal of dispersion science and technology Vol. 31; no. 3; pp. 332 - 337
Main Authors: Ovalıoğlu, Hüseyin, Peksoz, Ahmet, Kırımlı, Handan Engin, Yalçıner, Aytaç
Format: Journal Article
Language:English
Published: Philadelphia, PA Taylor & Francis Group 01-03-2010
Taylor & Francis
Taylor & Francis Ltd
Subjects:
Chemistry
Colloidal state and disperse state
Dynamic nuclear polarization
EPR spectra
Exact sciences and technology
fluorine-electron double resonance
free radical
General and physical chemistry
NMR
Nuclear magnetic resonance
Overhauser effect
Signal to noise ratio
Polarization
fluorine-electron double resonance
Fluorine
EPR spectrometry
Overhauser effect
Fluorine compound
NMR spectrometry
Dynamic nuclear polarization
Spectrometer
Free radical
Allyl complex
Intermolecular interaction
Dipolar interaction
Dynamics
Benzene
Resonance
Solvent
EPR spectra
Solution
Electrons
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Summary:The Overhauser effect type dynamic nuclear polarization experiments were performed to study solutions of the stable free radical α,γ-Bisdiphenylene-β-phenyl allyl complex with benzene (1:1) in some highly fluorinated aliphatic and aromatic solvents. In solutions examined in this study, it occurs mainly the Overhauser effect, which normally arises due to both dipolar and scalar interactions between the unpaired electrons of the free radical molecules and fluorine nuclei of solvent molecules. 1-Iodotridecafluorohexane, N-Methyl-bis-trifluoroacetamide, Octafluorotoluene and Hexafluorobenzene were used as the solvents. The experiments were performed at a low field double resonance NMR spectrometer, which operates at 1.53 mT. The NMR enhancements depend on competition between intermolecular magnetic interactions. It was studied to investigate variation of EPR spectra with four different temperatures. It was found as temperature increases, peak points of EPR spectra decreases.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0193-2691
1532-2351
DOI:10.1080/01932690903192572