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Nuclear Magnetic Resonance Relaxivities: Investigations of Ultrahigh‐Spin Lanthanide Clusters from 10 MHz to 1.4 GHz
Author(s) -
Machado Julyana R.,
Baniodeh Amer,
Powell Annie K.,
Luy Burkhard,
Krämer Steffen,
Guthausen Gisela
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402318
Subject(s) - relaxometry , relaxation (psychology) , paramagnetism , chemistry , nuclear magnetic resonance spectroscopy , nuclear magnetic resonance , spin (aerodynamics) , spectroscopy , lanthanide , chemical physics , spin echo , condensed matter physics , magnetic resonance imaging , physics , medicine , psychology , social psychology , ion , organic chemistry , quantum mechanics , radiology , thermodynamics
Paramagnetic relaxation enhancement is often explored in magnetic resonance imaging in terms of contrast agents and in biomolecular nuclear magnetic resonance (NMR) spectroscopy for structure determination. New ultrahigh‐spin clusters are investigated with respect to their NMR relaxation properties. As their molecular size and therefore motional correlation times as well as their electronic properties differ significantly from those of conventional contrast agents, questions about a comprehensive characterization arise. The relaxivity was studied by field‐dependent longitudinal and transverse NMR relaxometry of aqueous solutions containing Fe III 10 Dy III 10 ultrahigh‐spin clusters (spin ground state 100/2). The high‐field limit was extended to 32.9 T by using a 24 MW resistive magnet and an ultrahigh‐frequency NMR setup. Interesting relaxation dispersions were observed; the relaxivities increase up to the highest available fields, which indicates a complex interplay of electronic and molecular correlation times.