Syntheses, crystal structures and properties of two Mn(II) complexes of DTPA-bisamide derivative

Two new Mn(II) complexes of DTPA-bisamide derivative (H5L), MnH3L · CH3OH · 2.5H2O (1) and {[Mn2.5L(H2O)8] · 5.25H2O}n (2) were synthesized and structurally characterized. X-ray structure analyses show that the two complexes have quite different structures. The relaxivity of the two complexes were determined.