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Ultra-fast Ligand Self-Exchanging Gadolinium Complexes in Ionic Liquids for NMR Field Probes
Type of publication
Peer-reviewed
Publikationsform
Original article (peer-reviewed)
Author
Looser Anna Christina, Barmet Christoph, FoxThomas, Blacque Olivier, Gross Simon, Nussbaum Jennifer, Prüssmann Klaas, Alberto Roger,
Project
Homo-Fluorinated Paramagnetic Metal Complexes and Ionic Liquids for the Application in MRI Field Probe Devices
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Original article (peer-reviewed)
Journal
Inorganic Chemistry
Title of proceedings
Inorganic Chemistry
DOI
10.1021/acs.inorgchem.7b03191
Abstract
Concurrent magnetic field monitoring in MRI with an array of NMR field probes allows for reducing image imperfections. High 19F concentrations together with short relaxation times are basic probe properties. We present the NMR properties of [Gd(NTf2)4]- dissolved in an ionic liquid consisting of an imidazolium cation and the [NTf2]- anion. These solutions achieve fluorine concentrations as high as 26M and rapid relaxation times in the sub-msec range. The 2nd order self-exchange rate of coordinated [NTf2]- with [NTf2]- as determined with [Y(NTf2)4]- is 4.5105M-1s-1. X-ray structure analyses confirm the coordination number of eight around Gd3+ and Y3+. These ionic liquid solutions are thus excellent candidates for dynamically probing the NMR fields in MRI.
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