The crystallized solvent could influence the lanthanide water bonding?

[Gd(DOTAM)H2O](CF3SO3)3 · 3H2O (1) and [Gd(DOTAM)H2O](CF3SO3)3 · 0.5H2O · CH3CN (2) have the structure of the M isomer, with (SA) coordination geometry. The difference in Gd-Owater bond lengths of (2), important in the MRI experiments have been related, to the different network of hydrogen bonds involving the Gd coordinated water molecule. [Pr(DOTAM)H2O](CF3SO3)3 · H2O · CH3CN (3) has a twisted square antiprismatic (TSA) coordination geometry characteristic of the m isomer.