{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/84372"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/84372","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Molecular Dynamics and Spin-Spin Interactions in Complex Systems: High Field and Multifrequency EPR Approach","abstract":"It is shown that at high magnetic fields the Gd$\\sp{3+}$ ion itself serves a sensitive probe for the microenvironment. This sensitivity allows, for example, observation of pH changes and measurement of partitioning of the lipophilic Gd$\\sp{3+}$ complexes within the phospholipid membranes. Variations in the width and apparent g-factor of the Gd$\\sp{3+}$ EPR spectra with the microenvironment observed at high fields are interpreted as changes in the zero field splitting of the complex. 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This sensitivity allows, for example, observation of pH changes and measurement of partitioning of the lipophilic Gd$\\sp{3+}$ complexes within the phospholipid membranes. Variations in the width and apparent g-factor of the Gd$\\sp{3+}$ EPR spectra with the microenvironment observed at high fields are interpreted as changes in the zero field splitting of the complex. This argument is supported by multifrequency EPR data from 9 to 249 GHz.","Made available in DSpace on 2015-09-25T22:14:11Z (GMT). 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