Abstract The synthesis and characterization of four new DOTA-tetraamide ligands having variable alkyl chain lengths (C 1, C 12, C 14, and C 16) and their respective europium (III) complexes are reported. The three EuL complexes having long alkyl chains spontaneously form micelles of variable size. The critical micelle concentration differed for each complex (lower for the C 16 complex than the C 12 complex) while micelle size increased with ...