Quadrupole Relaxation Enhancement is a quantum mechanical effect that can be exploited to create a new generation of extrinsic contrast agents for usage in MRI. In this work we have investigated the physical requirements of such contrast agents have to meet to be useful. Based on our findings concerning nuclear quadrupole resonance-properties, spin relaxation behavior and toxicity we suggest a variety of 209Bi-aryl compounds. The sensitivity of these compounds onto chemical or magnetic field changes equip them with smart properties such as on/off switching of the contrast or molecular imaging.
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