Fig. 3 The coordination polyhedrons of the SA ([Pr(dota)(H2O)]−) and TSA ([Ce(dota)(H2O)]−).63 The coordinated water molecules (above the O4
plane) are omitted for clarity. Oxygen atoms are red, nitrogen atoms blue and lanthanides green. The x represents the average angle of rotation between
the O4 and N4 planes, d is the distance between the O4 and N4 plane centroids and w is the minimal value of the O–Ln–O opening angles.