Complexation of trivalent lanthanide cations by galactitol in the solid state. The crystal structure and an FT-IR study of 2NdCl 3·galactitol·14H 2O

Abstract

The crystal structure of 2NdCl 3·galactitol·14H 2O 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) Å 3, 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 2NdCl 3·galactitol·14H 2O and 2PrCl 3·galactitol·14H 2O are analogous, and show that Pr and Nd have the same coordination mode. The IR results are consistent with the crystal structures.