Lanthanide complexes of new polyaminocarboxylates with the bis-pyrazolylpyrimidine chromophore

We describe the straightforward synthesis of a new polyacid ligand derived from the bis-pyrazolylpyrimidine motif that displayed excellent properties concerning its ability to sensitize the emission of lanthanides. Emission lifetimes were in the range of ms and quantum yields were 0.15 and 0.85 for Eu and Tb, respectively, among the largest measured by us in related compounds, thus making this ligand an excellent candidate for its application in multitagging time-resolved fluoroimmunoassays.