Temperature‐Controlled Molecular Depolarization Gates in Nuclear Magnetic Resonance

Down the drain: Cryptophane cages in combination with selective radiofrequency spin labeling can be used as molecular “transpletor” units for transferring depletion of spin polarization from a hyperpolarized source spin ensemble to a drain ensemble. The flow of nuclei through the gate is adjustable by the ambient temperature, thereby enabling controlled consumption of hyperpolarization (see scheme).