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The Relationship between NMR Chemical Shifts of Thermally Polarized and Hyperpolarized 89 Y Complexes and Their Solution Structures.
Chemistry : a European Journal 2016 November 8
Recently developed dynamic nuclear polarization (DNP) technology offers the potential of increasing the NMR sensitivity of even rare nuclei for biological imaging applications. Hyperpolarized89 Y is an ideal candidate because of its narrow NMR linewidth, favorable spin quantum number (I=1/2 ), and long longitudinal relaxation times (T1 ). Strong NMR signals were detected in hyperpolarized89 Y samples of a variety of yttrium complexes. A dataset of89 Y NMR data composed of 23 complexes with polyaminocarboxylate ligands was obtained using hyperpolarized89 Y measurements or1 H,89 Y-HMQC spectroscopy. These data were used to derive an empirical equation that describes the correlation between the89 Y chemical shift and the chemical structure of the complexes. This empirical correlation serves as a guide for the design of89 Y sensors. Relativistic (DKH2) DFT calculations were found to predict the experimental89 Y chemical shifts to a rather good accuracy.
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