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  EPR spectroscopy of MRI-related Gd(III) complexes: Simultaneous analysis of multiple frequency and temperature spectra, including static and transient crystal field effects

Rast, S., Borel, A., Helm, L., Belorizky, E., Fries, P., & Merbach, A. (2001). EPR spectroscopy of MRI-related Gd(III) complexes: Simultaneous analysis of multiple frequency and temperature spectra, including static and transient crystal field effects. Journal of the American Chemical Society, 123, 2637-2644. doi:10.1021/ja003707u.

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 Creators:
Rast, Sebastian1, Author           
Borel, A1, Author
Helm, L1, Author
Belorizky, E1, Author
Fries, PH1, Author
Merbach, AE1, Author
Affiliations:
1external, ou_persistent22              

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Free keywords: ELECTRONIC RELAXATION; SPIN RELAXATION; GD3+ COMPLEXES; MULTIFREQUENCY EPR; AQUEOUS-SOLUTION; O-17 NMR; IONS; LINESHAPE; DYNAMICS; LIQUIDS
 Abstract: For the first time, a very general theoretical method is proposed to interpret the full electron paramagnetic resonance (EPR) spectra at multiple temperatures and frequencies in the important case of S-state metal ions complexed in liquid solution. This method is illustrated by a careful analysis of the measured spectra of two Gd3+ (S = 7/2) complexes. It is shown that the electronic relaxation mechanisms at the origin of the EPR line shape arise from the combined effects of the modulation of the static crystal field by the random Brownian rotation of the complex and of the transient zero-field splitting. A detailed study of the static crystal field mechanism,shows that, contrarily to the usual global models involving only second-order terms, the fourth and sixth order terms can play a non-negligible role. The obtained parameters are well interpreted in the framework of the physics of the various underlying relaxation processes. A better understanding of these mechanisms is highly valuable since they partly control the efficiency of paramagnetic metal ions in contrast agents for medical magnetic resonance imaging (MRI).

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Language(s): eng - English
 Dates: 2001
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000167632900020
DOI: 10.1021/ja003707u
 Degree: -

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Title: Journal of the American Chemical Society
Source Genre: Journal
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Pages: - Volume / Issue: 123 Sequence Number: - Start / End Page: 2637 - 2644 Identifier: ISSN: 0002-7863