Table 1.

M-O, M-N and M-N’ bond lengths in the 9-coordinated Gd-DOTA and TEMDO complexes.

Complex	M-N (Å)[a]	M-O (Å) [b]	M-N’ (Å) [c]	M-O’ [d]
[Gd(TEMDO)(H2O)]−	2,712	-	2,475	2.434
[La(TEMDO)(H2O)]−	2,780	-	2,616	2.507
[Gd(DOTA)(H2O)]−	2,648	2,377	-	2.458

^[a]N represents the basal rim nitrogen's.

^[b]Metal coordination to the four surrounding carboxylates

^[c]Metal coordination to the tetrazoles nitrogen N’

^[d]Average distance between the metal and water molecule.