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One contribution of 10 to a discussion meeting issue 'Challenges for chemistry in molecular imaging'. The CEST properties of EuDOTA-tetraamide complexes bearing pendant carboxylate and carboxyl ethyl esters were measured as a function of pH. The CEST signal from the Eu 3+ -bound water molecule decreased in intensity between pH 8.5 and 4.5 while the proton exchange rates (k ex ) increased over this same pH range. In comparison, the CEST signal in the corresponding carboxyl ester derivatives wasdoi:10.1098/rsta.2017.0113 pmid:29038382 fatcat:stzume3vvjakpgcubeyzuaflz4