Complexation of trivalent lanthanide cations by galactitol in the solid state. The crystal structure and an FT-IR study of 2NdCl3·galactitol·14H2O Original Research Article

The crystal structure of 2NdCl3·galactitol·14H2O has been determined. The crystal system is triclinic, space group: −1, with unit-cell dimensions: a=9.736(2), b=10.396, c=8.027 Å; α=108.05(3), β=92.68(3), γ=88.44(3)°, V=771.6(3) Å3, Z=2. Each Nd atom is coordinated to nine oxygen atoms, three from the alditol and six from water molecules, with NdO distances from 2.461 to 2.552 Å. The seventh water molecule is hydrogen-bonded by the hydroxyl hydrogen on O-1 (O-1H-11⋯O-10, 2.639 Å). The FT-IR spectra of 2NdCl3·galactitol·14H2O and 2PrCl3·galactitol·14H2O are analogous, and show that Pr and Nd have the same coordination mode. The IR results are consistent with the crystal structures.