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Paramagnetic chemical exchange saturation transfer (paraCEST) agents are well‐suited for imaging tissue pH because the basis of CEST, chemical exchange, is inherently sensitive to pH. Several previous pH‐sensitive paraCEST agents were based on an exchanging Ln3+‐bound water molecule as the CEST antenna but this design often added additional line‐broadening to the bulk water signal due to T2 exchange...
The EuII complex of 1,4,7,10‐tetraazacyclododecane‐1,4,7,10‐tetraacetic acid (DOTA) tetra(glycinate) has a higher reduction potential than most EuII chelates reported to date. The reduced EuII form acts as an efficient water proton T1 relaxation reagent, while the EuIII form acts as a water‐based chemical exchange saturation transfer (CEST) agent. The complex has extremely fast water exchange rate...
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