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Zero-Field Splitting in Gd(III) complexes: Towards a molecular understanding of paramagnetic relaxation
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0003-0916-4653
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The prime objectives of contrast agents in Magnetic Resonance Imaging(MRI) is to accelerate the relaxation rate of the solvent water protons in the surrounding tissue. Paramagnetic relaxation originates from dipole-dipole interactions between the nuclear spins and the fluctuating magnetic field induced by unpaired electrons. Currently Gadolinium(III) chelates are the most widely used contrast agents in MRI, and therefore it is incumbent to extend the fundamental theoretical understanding of parameters that drive the relaxation mechanism in these complexes.

Traditionally the Solomon-Bloembergen-Morgan equations have been utilized to describe relaxation times in terms, primarily of the Zeeman interaction, which is the splitting of degenerate energy levels due to an applied magnetic field. However, in compounds such as Gadolinium(III) complexes with total electron spins higher than 1 (in this case S=7/2) other interactions such as the Zero-Field Splitting(ZFS) play a significant role. ZFS is the splitting of degenerate energy levels in the absence of an external magnetic field. For this purpose, the current research delves into an understanding of the relaxation process, focusing on ZFS in various complexes of interest, using quantum chemical methods as well as molecular dynamic simulations.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University , 2015. , 48 p.
Keyword [en]
Zero-Field Splitting, Relaxation, Quantum Chemistry, Molecular Dynamics, Gd(III)
National Category
Atom and Molecular Physics and Optics
Research subject
Chemical Physics
Identifiers
URN: urn:nbn:se:su:diva-125107OAI: oai:DiVA.org:su-125107DiVA: diva2:891792
Opponent
Supervisors
Funder
EU, FP7, Seventh Framework Programme, 1058817
Available from: 2017-05-23 Created: 2016-01-07 Last updated: 2017-05-23Bibliographically approved

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