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Xenon capsule: A smart 129Xe NMR‐based sensor of Zn2+ ions for magnetic resonance imaging (MRI) is proposed. The resonance frequency of xenon encapsulated in a cryptophane that bears a nitrilotriacetic ligand moiety varies when Zn2+ ions are present in solution (see picture). With hyper‐polarized gas, such a construct enables detection of 100 nM zinc in one xenon batch, a threshold 300 times lower...
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